Journal articles: 'Niobium alloys – Mechanical properties'

1

Kulyashova, Kseniya, Yuri P. Sharkeev, and Aizhan Sainova. "Mechanical Properties of Calcium Phosphate Coatings Produced by Method of RF-Magnetron Sputtering on Bioinert Alloys." Advanced Materials Research 1013 (October 2014): 188–93. http://dx.doi.org/10.4028/www.scientific.net/amr.1013.188.

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Results of research of mechanical properties of calciumphosphate coatings produced by the method radio frequency magnetron sputtering on bioinert alloys of titanium, zirconium and were presented. Calcium phosphate coatings show high value of adhesion strength to bioinert metal surface. Calcium phosphate coating on titanium-niobium alloy surface shows the highest value of adhesion strength. Mechanical properties of a composite material based on bioinert alloy and calcium phosphate coating are higher than properties of the components of composite material separately.

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Seixas, M. R., C. Bortolini Jr., R. T. Konatu, A. Pereira Jr., and Ana Paula Rosifini Alves Claro. "Mechanical and Microstructural Characterization of the Ti-25Ta-25Nb Alloy for Dental Applications." Materials Science Forum 869 (August 2016): 935–39. http://dx.doi.org/10.4028/www.scientific.net/msf.869.935.

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Titanium and its alloys have been used in biomedical applications due to their excellent properties such as high corrosion resistance, biocompatibility and mechanical properties. In orthodontics, initially, it was common to use nickel-titanium alloys, however due to allergic reactions of patients, new titanium alloys containing elements such as niobium and tantalum are being studied. The Ti-25Ta-25Nb alloy is a β-titanium alloy and it has a low elastic modulus. In the present work, the ternary alloy was evaluated after cold work by swaging followed by solubilization treatment. Microstructure and mechanical properties were evaluated after each step of the process. Results were similar to find in the literature for this alloy obtained by other processing rote.

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Devecili, Ahmet Oktay, and Rifat Yakut. "The Effect of Nb Supplement on Material Characteristics of Iron with Lamellar Graphite." Advances in Materials Science and Engineering 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/465947.

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In this experiment a cast iron alloy consisting of 0.019, 0.151, 0.431, and 0.646% niobium by weight was set and the microstructure solidification of iron with lamellar graphite was provided. These alloys were subjected to an abrasion test and chemical analyses of the microstructure were done by using scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). In addition to this, phase compositions were characterised by X-ray diffraction (XRD). Tests of mechanical strength, hardness, and tension were also applied to the alloys. The results of this experiment demonstrated that the addition of niobium to iron with lamellar graphite caused an increase in the abrasion resistance by 15%. This experiment shows that adding niobium improves the mechanical properties of grey cast iron.

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Benghalem, A., and D. G. Morris. "Microstructure and mechanical properties of concentrated copperniobium alloys prepared by mechanical alloying." Materials Science and Engineering: A 161, no. 2 (April 1993): 255–66. http://dx.doi.org/10.1016/0921-5093(93)90520-o.

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Nochovnaya, N. A., V. I. Ivanov, and L. Yu Avilochev. "INTERMETALLIC COMPOUND AlxTi – ARE PROMISING MATERIAL FOR HIGH ELEVATED TEMPERATURES (review) Part 2. The mechanical properties of the intermetallic Al2Ti compound and the effect of alloying." Proceedings of VIAM, no. 4 (2021): 32–47. http://dx.doi.org/10.18577/2307-6046-2021-0-4-32-47.

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Intermetallide alloys based on the Al2Ti compound are the most promising heat-resistant materials for future energy plants.The review examines the mechanical properties of the Al2Ti Intermetalide, two-phase alloys based on it and the doped niobium alloy. For use at temperatures of up to 950 °С, alloys with phase composition r-Al2Ti + γ-TiAl and platemicrostructure with additional doping of refractory elements are of interest.

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Yukawa, Hiroshi, Masahiko Morinaga, T. Nambu, and Yoshihisa Matsumoto. "A New Concept for Alloy Design of Nb-Based Hydrogen Permeable Alloys with High Hydrogen Permeability and Strong Resistance to Hydrogen Embrittlement." Materials Science Forum 654-656 (June 2010): 2827–30. http://dx.doi.org/10.4028/www.scientific.net/msf.654-656.2827.

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A concept for alloy design of Nb-based hydrogen permeable alloys has been proposed based on the mechanical properties of niobium in hydrogen atmosphere and also on the hydrogen chemical potential in metal membrane. Following this concept, Nb-based alloys are designed and developed that possess excellent hydrogen permeability without showing any hydrogen embrittlement.

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Khromova, L. P., N. B. Dyakonova, Yu L. Rodionov, G. V. Yudin, and I. Korms. "Martensitic transformations, thermal expansion and mechanical properties of titanium-niobium alloys." Journal de Physique IV (Proceedings) 112 (October 2003): 1051–54. http://dx.doi.org/10.1051/jp4:20031062.

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Grandini, Carlos Roberto, Luciano Henrique de Almeida, and Durval Rodrigues Júnior. "Oxygen Diffusion in an Nb-Ta Alloy Measured by Mechanical Spectroscopy." Defect and Diffusion Forum 312-315 (April 2011): 1228–32. http://dx.doi.org/10.4028/www.scientific.net/ddf.312-315.1228.

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When metals that present bcc crystalline structure receive the addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, they undergo significant changes in their physical properties because they are able to dissolve great amounts of those interstitial elements, and thus form solid solutions. Niobium and most of its alloys possess a bcc crystalline structure and, because Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this study, mechanical spectroscopy (internal friction) measurements were performed on Nb-8.9wt%Ta alloys containing oxygen in solid solution. The experimental results presented complex internal friction spectra. With the addition of substitutional solute, interactions between the two types of solutes (substitutional and interstitial) were observed, considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for oxygen in this alloy.

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Farrahnoor, Ahmad, and Hussain Zuhailawati. "Review on the mechanical properties and biocompatibility of titanium implant: The role of niobium alloying element." International Journal of Materials Research 112, no. 6 (May 1, 2021): 505–13. http://dx.doi.org/10.1515/ijmr-2020-8060.

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Abstract Biomedical titanium alloys with elastic moduli close to that of cortical bone have gained great attention in the field of bone implantation. A low modulus is desirable in an implant to prevent stress shielding, which usually leads to critical clinical issues, such as bone resorption and implant loosening. The use of β-type titanium with nontoxic alloying elements, such as niobium, as a novel candidate of implant material for replacing failed hard tissues has shown great potential. This review describes a titanium implant application alloyed with niobium and the mechanical properties and bioactivity of various titanium alloys sintered at different temperatures.

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Ahmed, Mostafa, Mohamed Soliman, Mervat Youssef, Rüdiger Bähr, and Adel Nofal. "Effect of Niobium on the Microstructure and Mechanical Properties of Alloyed Ductile Irons and Austempered Ductile Irons." Metals 11, no. 5 (April 25, 2021): 703. http://dx.doi.org/10.3390/met11050703.

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In this research, different ductile irons and austempered ductile irons were successfully developed using several alloying contents of nickel, copper and microalloying with niobium. Additionally, special nanocarbon powder was added to the molten iron to enhance the nucleation tendency of spheroidal graphite and compensate for the possible negative effect of Nb addition on the nodule morphology. Metallographic analysis showed that increasing the niobium content in the alloy to 0.1 wt % raises the number of graphite eutectic cells and refines the final structure of the graphite. Moreover, the nodule count of graphite slightly increased, but it concurrently decreased the nodularity when the Nb amount reached 0.1 wt %. SEM micrographs illustrated that nano- to microsized niobium carbides (NbC) particles were dispersed in the matrix of the Nb microalloyed ductile irons. Both optical and SEM micrographs clearly showed that alloying of ductile irons with nickel, copper and microalloying with niobium had a significant effect on defining the final pearlite structure. Coarse, fine, broken and spheroidized pearlite structures were simultaneously observed in all investigated alloys. Dilatometry studies demonstrated that the nano NbC particles acted as nucleation sites for graphite and ferrite needles. Therefore, Nb addition accelerated the formation of ausferrite during the austempering stage. Finally, alloying with Cu, Ni and microalloying with Nb led to developing novel grades of ADI with excellent strength/ductility property combination.

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He, Xiang Ming, De Sheng Yan, Zhi Min Jiang, and Li Jian Rong. "Effect of Nb-Content on Mechanical Properties of (Ni₄₇Ti₄₄)_100-xNb_x Shape Memory Alloys." Materials Science Forum 475-479 (January 2005): 1945–48. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.1945.

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A ternary alloying element Niobium addition to the Ni-Ti shape memory alloy could optimize transformation temperatures, mechanical properties. In this paper, with the help of ambient tensile test and scan electron microscope observation, the influences of Nb-content on the mechanical properties of (Ni47Ti44)100-xNbx alloys were investigated in detail. The results indicated that both the fracture strength (sb) and the elongation (d) decreased gradually with the increasing of the Nb content. The fracture surfaces showed the fracture character of the alloys was clearly gliding fracture, which is typically transgranular fracture mode.

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Hon, Yen-Huei, Jian-Yih Wang, and Yung-Ning Pan. "Composition/Phase Structure and Properties of Titanium-Niobium Alloys." MATERIALS TRANSACTIONS 44, no. 11 (2003): 2384–90. http://dx.doi.org/10.2320/matertrans.44.2384.

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13

Hankwitz, Jameson P., Christopher Ledford, Christopher Rock, Scott O’Dell, and Timothy J. Horn. "Electron Beam Melting of Niobium Alloys from Blended Powders." Materials 14, no. 19 (September 24, 2021): 5536. http://dx.doi.org/10.3390/ma14195536.

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Niobium-based tungsten alloys are desirable for high-temperature structural applications yet are restricted in practice by limited room-temperature ductility and fabricability. Powder bed fusion additive manufacturing is one technology that could be leveraged to process alloys with limited ductility, without the need for pre-alloying. A custom electron beam powder bed fusion machine was used to demonstrate the processability of blended Nb-1Zr, Nb-10W-1Zr-0.1C, and Nb-20W-1Zr-0.1C powders, with resulting solid optical densities of 99+%. Ultimately, post-processing heat treatments were required to increase tungsten diffusion in niobium, as well as to attain satisfactory mechanical properties.

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Chlupová, A., M. Heczko, K. Obrtlík, J. Polák, P. Roupcová, P. Beran, and T. Kruml. "Mechanical properties of high niobium TiAl alloys doped with Mo and C." Materials & Design 99 (June 2016): 284–92. http://dx.doi.org/10.1016/j.matdes.2016.03.079.

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15

Karpov, M. I., D. V. Prokhorov, V. I. Vnukov, T. S. Stroganova, B. A. Gnesin, I. B. Gnesin, I. S. Zheltyakova, and I. L. Svetlov. "Structure and High-Temperature Mechanical Properties of High-Carbon Niobium-Based Alloys." Russian Metallurgy (Metally) 2019, no. 10 (October 2019): 1018–23. http://dx.doi.org/10.1134/s0036029519100124.

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16

Zhonghua, Zhang, Sun Yangshan, and Guo Jun. "Effect of niobium addition on the mechanical properties of Fe3Al-based alloys." Scripta Metallurgica et Materialia 33, no. 12 (December 1995): 2013–17. http://dx.doi.org/10.1016/0956-716x(95)00437-z.

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17

Olesova, Valentina Nikolaevna, R. G. Khafizov, K. V. Shmatov, A. S. Ivanov, and D. V. Martynov. "DYNAMICS OF OSTEOINTEGRATION OF CONSTRUCTION MATERIALS OF DENTAL IMPLANTS ON ELECTRON-MICROSCOPIC ESTIMATION DATA AND ELEMENTAL ANALYSIS OF THE COMPOSITION OF BONE TISSUE." Russian Journal of Dentistry 22, no. 4 (August 15, 2018): 172–75. http://dx.doi.org/10.18821/1728-2802-2018-22-4-172-175.

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The relevance of the use of superelastic titanium alloys in medicine is due to biomechanical advantages when interacting with the tissues of the body. To date, such an alloy is known - titanium nickelide, but the high content of nickel limits its use. Superelastic alloys of titanium (titanium-niobium-zirconium and titanium-niobium-tantalum) are more favorable in comparison with titanium for dental implants due to physico-mechanical properties closer to bone tissue. Animal morphological studies of the biocompatibility of these alloys in comparison with titanium have been carried out. Control of the interaction with the bone tissue of titanium alloy samples was 30 and 90 days; The method of investigation is scanning electron microscopy and microprobe element analysis of tissue along the boundary with titanium alloys. The proximity of the morphological pattern and elemental composition of bone tissue along the border with titanium and superelastic alloys of titanium is shown, both at a control period of 30 days (in contact with alloys, a poorly mineralized connective tissue is found) and under control of 90 days (the border with titanium alloys is covered with mineralized bone tissue, similar in composition to the surrounding bone tissue). based on niobium with bone tissue.

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18

McKamey, C. G., P. J. Maziasz, and J. W. Jones. "Effect of addition of molybdenum or niobium on creep-rupture properties of Fe3Al." Journal of Materials Research 7, no. 8 (August 1992): 2089–106. http://dx.doi.org/10.1557/jmr.1992.2089.

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Recent alloy development efforts have shown that Fe3Al-based alloys can have room temperature tensile ductilities of 10–20% and yield strengths of 500 MPa at temperatures to 600 °C. These property improvements are important for enabling the use of iron-aluminides for structural applications that require their excellent corrosion resistance. New data are presented here from creep-rupture studies on Fe3Al and on Fe3Al-based alloys containing molybdenum or niobium plus zirconium. Binary Fe3Al alloys have low creep resistance, but the addition of 2 at. % Mo or 1% Nb plus 0.1% Zr increases the creep life and reduces the minimum creep rate, with the niobium-containing alloy being the strongest. The improvement in creep life is the result of a combination of factors which include grain boundary strengthening, resistance to dynamic recrystallization during stressing, precipitation strengthening, and changes in the formation and mobility of the dislocation network. Correlation of optical, scanning electron, and transmission electron microscopy data suggests that the intergranular creep failure found in Fe3Al after creep testing at 550–650 °C is related to weak high-angle grain boundaries and to formation of subgrain boundary arrays, which reduce the ability of dislocations to glide or multiply to produce matrix plasticity. The addition of niobium/zirconium results in solid solution strengthening effects, as well as the formation of fine MC precipitates (a small amount of carbon is present as a contaminant from the casting process) which strengthen both the matrix and grain boundaries. The result relative to the binary alloy is increased creep-rupture strength and life coupled with a change to a ductile-dimple transgranular failure mode. This suggests that the mechanisms that cause failure during creep can be controlled by macro- and microalloying effects.

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Anil Kumar, V., M. K. Karthikeyan, E. G. Vinayan, Rohit Kumar Gupta, P. Ram Kumar, and Parameshwar Prasad Sinha. "Electron Beam Welding Studies on Nb-Hf-Ti Refractory Alloy." Materials Science Forum 710 (January 2012): 608–13. http://dx.doi.org/10.4028/www.scientific.net/msf.710.608.

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Niobium, a refractory metal is mainly used as alloying addition in steels, superalloys, titanium and copper alloys. Being lightest refractory metal with high melting temperature, niobium based alloys are developed for high temperature applications of aerospace systems. However, poor oxidation resistance at elevated temperature limits its fabrication options and also requires oxidation protection in service. Among the fabrication methods, electron beam welding has been found to be a realistic option and the same has been studied in the present work. The paper presents the details of the Electron Beam Welding study carried out in developing the welding procedure for this alloy. An attempt has been made to correlate the weldment microstructure with the mechanical properties.

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Aliakseyeu, Yu G., A. Yu Korolyov, V. S. Niss, A. E. Parshuto, and A. S. Budnitskiy. "ELECTROLYTE-PLASMA POLISHING OF TITANIUM AND NIOBIUM ALLOYS." Science & Technique 17, no. 3 (May 31, 2018): 211–19. http://dx.doi.org/10.21122/2227-1031-2018-17-3-211-219.

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Titanium and niobium alloys are widely used at present in aircraft, nuclear energy, microwave technology, space and ultrasonic technology, as well as in manufacture of medical products. In most cases production technology of such products involves an implementation of a quality polishing surface. Mechanical and electrochemical methods are conventionally used for polishing products made of titanium and niobium alloys. Disadvantages of mechanical methods are low productivity, susceptibility to introduction of foreign particles, difficulties in processing complex geometric shapes. These materials are hard-to-machine for electrochemical technologies and processes of their polishing require the use of toxic electrolytes. Traditionally, electrochemical polishing of titanium and niobium alloys is carried out in acid electrolytes consisting of toxic hydrofluoric (20–25 %), sulfuric nitric and perchloric acids. The disadvantage of such solutions is their high aggressiveness and harmful effects for production personnel and environment. This paper proposes to use fundamentally new developed modes of electrolytic-plasma treatment for electrolyte-plasma polishing and cleaning products of titanium and niobium alloys while using simple electrolyte composition based on an aqueous ammonium fluoride solution providing a significant increase in surface quality that ensures high reflectivity. Due to the use of aqueous electrolyte the technology has a high ecological safety in comparison with traditional electrochemical polishing. The paper presents results of the study pertaining to the effect of titanium and niobium electrolytic-plasma polishing characteristics using the developed mode for productivity, processing efficiency, surface quality, and structure and properties of the surface to be treated. Based on the obtained results, processes of electrolytic-plasma polishing of a number of products made of titanium alloys BT6 (Grade 5), used in medicine and aircraft construction, have been worked out in the paper.

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Grandini, Carlos Roberto, Luciano Monteiro da Silva, Luciano Henrique de Almeida, Odila Florêncio, and Hugo Ricardo Zschommler Sandim. "Nitrogen Diffusion in the Nb-2.0wt%Ti Measured by Mechanical Spectroscopy." Defect and Diffusion Forum 273-276 (February 2008): 256–60. http://dx.doi.org/10.4028/www.scientific.net/ddf.273-276.256.

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Metals that present bcc crystalline structure, when receiving addition of interstitial atoms as oxygen, nitrogen, hydrogen and carbon, undergo significant changes in their physical properties, being able to dissolve great amounts of those interstitial elements, thus forming solid solutions. Niobium and most of its alloys possess bcc crystalline structure and, as Brazil is the largest world exporter of this metal, it is fundamental to understand the interaction mechanisms between interstitial elements and niobium or its alloys. In this paper, mechanical spectroscopy (internal friction) measurements were performed in Nb-2.0wt%Ti alloys containing nitrogen in solid solution. The experimental results presented complex internal friction spectra and with the addition of substitutional solute, it was observed interactions between the two types of solutes (substitutional and interstitial), considering that the random distribution of the interstitial atoms was affected by the presence of substitutional atoms. Interstitial diffusion coefficients, pre-exponential factors and activation energies were calculated for nitrogen in the Nb-2.0wt%Ti alloys.

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Prima, Frédéric, Fan Sun, Wafa El May, Thierry Gloriant, Pascal Laheurte, Laurence Jordan, Philippe Vermaut, Richard Portier, and Yu Lin Hao. "Optimization of Superelastic Properties in Titanium-Niobium Alloys Using Short-Time Thermal Treatments." Materials Science Forum 738-739 (January 2013): 554–58. http://dx.doi.org/10.4028/www.scientific.net/msf.738-739.554.

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The short-time thermal treatment strategy has been proved to be very efficient in improving the mechanical properties of various titanium based alloys. The mechanical properties of alloys such as Ti-Nb, Ti-Nb-Zr and Ti-Nb-Zr-Sn based alloys, are extremely sensitive to the β phase stability, microstructure and phase constitution. The concept of the short-time treatment is designed to control precisely the material structure (phase precipitation, etc…) without extensive modification of the distribution of alloying elements. This results in reliable optimizations regarding the balance between elastic modulus, pseudo- (super-) elasticity and strength. Currently, the structural evolution mechanisms involved in the STAT are under systematic investigations in the aim of achieving accurate control of the microstructures and optimized balance of mechanical properties.

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23

Olesova, V. N., N. A. Uzunyan, R. G. Khafizov, A. S. Ivanov, E. E. Olesov, and F. G. Shumakov. "Superelastic nickel-free titanium alloys as materials for dental implants (experimental study)." Journal of Clinical Practice 9, no. 2 (December 5, 2018): 68–73. http://dx.doi.org/10.17816/clinpract09268-73.

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Superelastic alloys of titanium (titanium-niobium-zirconium and titanium-niobium-tantalum) are more favorable in comparison with titanium for dental implants due to their physico-mechanical properties closer to those of bone tissue. Animal morphological studies of the biocompatibility of these alloys in comparison with titanium have been carried out. The control of the titanium alloy samples’ interaction with bone tissue was performed at the time points of 30 and 90 days; scanning electron microscopy and microprobe element analysis of tissue along the boundary with titanium alloys were used as the methods of investigation. The proximity of the morphological pattern and elemental composition of bone tissue along the border with titanium and superelastic alloys of titanium is shown, both at the control period of 30 days (in contact with alloys, a poorly mineralized connective tissue is found) and at 90 days (the border with titanium alloys is covered with mineralized bone tissue, similar in its composition to the surrounding bone tissue).

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Czyż, Olaf, Jan Kusiński, Agnieszka Radziszewska, Zhongquan Liao, Ehrenfried Zschech, Małgorzata Kąc, and Roman Ostrowski. "Study of Structure and Properties of Fe-Based Amorphous Ribbons after Pulsed Laser Interference Heating." Journal of Materials Engineering and Performance 29, no. 10 (September 15, 2020): 6277–85. http://dx.doi.org/10.1007/s11665-020-05109-w.

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AbstractThe paper is devoted to the study of microstructural and magnetic properties of the Fe-based amorphous ribbons after interference pulsed laser heating. The ternary amorphous alloy FeSiB, as well as the multi-component alloys FeCuSiB and FeCuNbSiB, was subjected to laser pulses to induce crystallization in many microislands simultaneously. Structure and properties changes occurred in laser-heated dots. Detailed TEM analysis from a single dot shows the presence of FeSi(α) nanocrystals in the amorphous matrix. The FeSiB alloy is characterized after conventional crystallization by a dendritic structure; however, the alloys with copper as well copper and niobium additions are characterized by the formation of equiaxed crystals in the amorphous matrix. Amorphous alloys before and after the laser heating are soft magnetic; however, conventional crystallization leads to a deterioration of the soft magnetic properties of the material.

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Kim, Byung-Ryang, Kee-Do Woo, Jin-Kook Yoon, Jung-Mann Doh, and In-Jin Shon. "Mechanical properties and rapid consolidation of binderless niobium carbide." Journal of Alloys and Compounds 481, no. 1-2 (July 2009): 573–76. http://dx.doi.org/10.1016/j.jallcom.2009.03.036.

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Qu, Shi Yu, Ya Fang Han, and Liguo Song. "Microstructures and Properties of Refractory Niobium-Silicide-Based Composites." Materials Science Forum 475-479 (January 2005): 737–40. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.737.

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The microstructures, mechanical properties and oxidation resistance of the refractory Nb-silicide-based composites have been investigated by scanning electron microscopy (SEM), X-ray diffraction (XRD), compression tests and high-temperature oxidation experiments. The results showed that 1773K/100h heat-treatment was an optimum processing for acquiring equilibrium Nb solid solution and silicides microstructure. In the binary Nb-Si system, the microstructure consisted of continuous Nb5Si3 equilibrium matrix and dispersed Nb particles, while in the the Nb-Ti-Cr-Al-Si-(Hf) multicomponent system, there are two typical microstructures, i.e., a two-phase structure of β (Nb solid solution)+D81 Nb5Si3-type silicide in the alloys with the Si+Al content (15at.% and 6at.%, respectively), and a three-phase structure of β+D81 Nb5Si3-type + D88 Ti5Si3-type silicides in the alloys with lower Si+Al content (10at.% and 8at.%, respectively). The results of compression tests showed that all alloys display high strength at both room and high temperatures, only a slight decrease in compression properties occured for Nb-Ti-Cr-Al-Si alloys, comparing to the binary Nb-Si in-situ composites. This type of alloys possesses good high temperature strengths up to at least 1473K. The results of high-temperature oxidation experiments showed that the oxidation rates of the alloys with Ti, Cr, Al and Hf addition were at least one order of magnitude lower than those of the Nb-Si binary alloys.

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Zhang, Zheng-Rong, and Wen-Xi Liu. "Mechanical properties of Fe3Al-based alloys with addition of carbon, niobium and titanium." Materials Science and Engineering: A 423, no. 1-2 (May 2006): 343–49. http://dx.doi.org/10.1016/j.msea.2006.02.031.

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Ivanov, Eugene, Eduardo del Rio, Igor Kapchemnko, Maija Nyström, and Juha Kotila. "Development of Bio-Compatible Beta Ti Alloy Powders for Additive Manufacturing for Application in Patient-Specific Orthopedic Implants." Key Engineering Materials 770 (May 2018): 9–17. http://dx.doi.org/10.4028/www.scientific.net/kem.770.9.

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The use and application of alloys as biomedical alloys have increased over the past few years owing to their excellent biocompatibility, corrosion resistance, high mechanical and fatigue resistance, low density, adequate wear resistance, and low elastic modulus. Orthopedic implant materials are exposed to high mechanical loading. Conventional materials based on Ti-6Al-4V, stainless steel or cobalt-chromium alloys demonstrate good mechanical strength, but also some toxicological concerns due to release of toxic elements which may result in inflammatory reactions. Metal alloys based on titanium, zirconium, tantalum and niobium represent higher biocompatibility with appropriate mechanical properties for avoiding stress-shielding and consecutive implant loosening. Application of specifically designed spherical β-titanium alloy powders in additive manufacturing, such as selective laser melting (SLM) or electron beam melting (EBM); enable the production of components with a high degree in freedom of design. Accordingly, SLM or EBM of Ti/Nb (/Ta) alloys offer the possibility to fabricate patient-specific orthopedic implants. The present paper describes development of β-titanium alloys powders designed for application in additive manufacturing technologies. TiNbZrTa (TNZT)-based 3D structures were successfully manufactured and mechanically tested.

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Matougui, N., David Piot, M. L. Fares, and Frank Montheillet. "Influence of Niobium Content on the Hot Mechanical Behavior of Nickel Alloys." Materials Science Forum 879 (November 2016): 1251–57. http://dx.doi.org/10.4028/www.scientific.net/msf.879.1251.

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Nickel-base superalloys are usually employed for large forged parts in aerospace industry. A comprehensive understanding of their mechanical behavior during hot working is required, especially for manufacturers in order to enhance the in-service properties. In this context, the first part of the work aims at investigating the mechanical behavior of nickel during hot deformation, with particular emphasis on the influence of niobium additions in solid solution. For this purpose, a series of wrought model alloys including pure nickel and Ni-Nb alloys (Ni-0.01, 0.1, 1, 2, 5 and 10 wt. % Nb) were prepared and deformed by hot torsion at temperatures ranging from 800 to 1000 °C degrees and at three (von Mises equivalent) strain rates of 0.03, 0.1 and 0.3 s-1. Afterwards, the key rheological parameters that characterize strain hardening and dynamic recovery were determined through a simple analytical method based on the classical Laasraoui-Jonas constitutive equation, allowing reasonable fit for the flow curves for all studied Ni-Nb alloys. In this way, the effect of niobium solutes on the fundamental mechanisms of deformation was well highlighted. In the second part, three usual models describing strain hardening and dynamic recovery, referred to as the Laasraoui-Jonas (LJ), Kocks-Mecking (KM), and power law (PW) equations are compared within the range of moderate strains. Transformation formulae are derived, allowing the parameters of one law to be computed from the parameters of any of the two others. The theoretical derivations are illustrated by the specific case of a Ni-Nb alloy in the solid solution domain.

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Singh, M., and D. R. Behrendt. "Reactive melt infiltration of silicon-niobium alloys in microporous carbons." Journal of Materials Research 9, no. 7 (July 1994): 1701–8. http://dx.doi.org/10.1557/jmr.1994.1701.

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Studies of the reactive melt infiltration of silicon-niobium alloys in microporous carbon preforms prepared by the pyrolysis of a polymer precursor have been carried out using modeling, DTA, and melt infiltration. Mercury porosimetry results indicate a very narrow pore size distribution with virtually all the porosity within the carbon preforms open to infiltrants. The morphology and amount of the residual phases (niobium disilicide and silicon) in the infiltrated material can be tailored according to requirements by careful control of the properties (pore size and pore volume) of the porous carbon preforms and alloy composition. The average room temperature four-point fiexural strength of a reaction-formed silicon carbide material (made by the infiltration of medium pore size carbon preform with Si–5 at. % Nb alloy) is 290 ± 40 MPa (42 ± 6 ksi) and the fracture toughness is 3.7 ± 0.3 . The fiexural strength decreases at high temperatures due to relaxation of residual thermal stresses and the presence of free silicon in the material.

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Yolun, Abdurrahman, Murat Şimşek, Mehmet Kaya, Ebru Elibol Annaç, Mustafa Köm, and Ömer Çakmak. "Fabrication, characterization, and in vivo biocompatibility evaluation of titanium-niobium implants." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 235, no. 1 (September 28, 2020): 99–108. http://dx.doi.org/10.1177/0954411920960854.

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In this study, biocompatible titanium-niobium (Ti-Nb) alloys were fabricated by using powder metallurgy methods. Physical, morphological, thermal, and mechanical analyses were performed and their in vivo compatibility was evaluated. Besides α, β, and α″ martensitic phases, α+β Widmanstätten phase due to increasing sintering temperature was seen in the microstructure of the alloys. Phase transformation temperatures of the samples decreased as Nb content increased. The ratio of Nb in the samples affected their mechanical properties. No toxic effect was observed on implanted sites. This study shows that Ti-Nb alloys can be potentially used for orthopedic applications without any toxic effects.

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Kovalevskaya, Zhanna G., Margarita A. Khimich, Andrey V. Belyakov, and Ivan A. Shulepov. "Evaluation of Physical and Mechanical Properties of Structural Components of Ti-Nb Alloy." Advanced Materials Research 1040 (September 2014): 39–42. http://dx.doi.org/10.4028/www.scientific.net/amr.1040.39.

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By the results of X-ray analysis, microstructural analysis, nanohardness and elastic modulus measurements it was defined that non-equilibrium phases during the process of crystallization are formed in the titanium-niobium alloy with 40wt.% of Nb. The minimum of non-equilibrium phases is formed at the Ti-40wt.% Nb alloy. The uniform grain structure, which consists of β-phase grains with the minimum of elastic modulus, is formed in the alloy ingot. Such structure and complex of properties allows using this alloy for severe plastic deformation.

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Zhang, Yuqing, Danni Sun, Jun Cheng, James Kit Hon Tsoi, and Jiang Chen. "Mechanical and biological properties of Ti–(0–25 wt%)Nb alloys for biomedical implants application." Regenerative Biomaterials 7, no. 1 (November 28, 2019): 119–27. http://dx.doi.org/10.1093/rb/rbz042.

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Abstract Binary titanium–niobium (Ti–Nb) alloys have recently been attracted due to low Young’s moduli and non-toxic properties. This study explores the influence of low Nb content (0–25 wt%) on the comprehensive parameters of tensile stress–strain relationships (ultimate strength (σUTS), yield strength (σ0.2) and elastic modulus (E)), surfaces properties (Vickers microhardness, surface roughness (Ra), water contact angle (WCA), X-ray diffraction (XRD) and scanning electron microscopy (SEM)), corrosion resistance (in artificial saliva and lactic acid) and biological properties (cytotoxicity and alkaline phosphatase activity of MC3T3-E1 pre-osteoblasts) of Ti–xNb alloys (x = 5, 10, 15, 20 and 25 wt%), with using commercially pure grade 2 titanium (cp-Ti) as control. XRD results shown that all the Ti–xNb alloys comprised α + β Ti alloy phases, such that the β phase increased correspondingly with the increased amount of Nb in the alloy, as well as the reduction of E (69–87 GPa). Except Ti–5Nb, all other Ti–xNb alloys showed a significantly higher hardness, increased σUTS and σ0.2, and decreased WCA compared with cp-Ti. No corrosion was detected on Ti–xNb alloys and cp-Ti in artificial saliva and lactic acid solutions. The cytotoxicity of Ti–xNb alloys was comparable to that of cp-Ti in MC3T3-E1 pre-osteoblasts without interference from differentiation behaviour, but the proliferation rate of the Ti–5Nb alloy was lower than other groups. In overall, binary Ti–(10–25 wt%)Nb alloys are promising candidate for orthopaedic and dental implants due to their improved mechanical properties and comparable biological performance, while Ti–5Nb should be used with caution.

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Zhang, Xu, Tao Fu, Kunkun Cui, Yingyi Zhang, Fuqiang Shen, Jie Wang, Laihao Yu, and Haobo Mao. "The Protection, Challenge, and Prospect of Anti-Oxidation Coating on the Surface of Niobium Alloy." Coatings 11, no. 7 (June 22, 2021): 742. http://dx.doi.org/10.3390/coatings11070742.

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Niobium (Nb)-based alloys have been extensively used in the aerospace field owing to their excellent high-temperature mechanical properties. However, the inferior oxidation resistance severely limits the application of Nb-based alloys in a high-temperature, oxygen-enriched environment. Related scholars have extensively studied the oxidation protection of niobium alloy and pointed out that surface coating technology is ideal for solving this problem. Based on the different preparation methods of Nb-based alloys’ surface coatings, this article summarizes the relevant research of domestic and foreign scholars in the past 30 years, including the slurry sintering method (SS), suspension plasma spraying method (SPS), and halide activated pack cementation method (HAPC), etc. The growth mechanism and micromorphology of the coatings access by different preparation methods are evaluated. In addition, the advantages and disadvantages of various coating oxidation characteristics and coating preparation approaches are summarized. Finally, the coating’s oxidation behavior and failure mechanism are summarized and analyzed, aiming to provide valuable research references in related fields.

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Pramanik, S., V. Rao, and O. N. Mohanty. "Effect of niobium on the directional solidification and properties of Alnico alloys." Journal of Materials Science 28, no. 5 (March 1993): 1237–44. http://dx.doi.org/10.1007/bf01191958.

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Ahssi, Mohamed Ahmed Mohamed, Mehmet Akif Erden, Mustafa Acarer, and Harun Çuğ. "The Effect of Nickel on the Microstructure, Mechanical Properties and Corrosion Properties of Niobium–Vanadium Microalloyed Powder Metallurgy Steels." Materials 13, no. 18 (September 10, 2020): 4021. http://dx.doi.org/10.3390/ma13184021.

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In this study, the effects of adding Ni in different ratios to Fe-matrix material containing C-Nb-V produced by powder metallurgy on microstructure, tensile strength, hardness and corrosion behaviors were investigated. Fe-C and Fe-C-Nb-V powders containing 5%, 10%, 13%, 15%, 20%, 30% and 40% nickel were pressed at 700 MPa and then sintered in an Ar atmosphere at 1400 °C. Microstructures of the samples were characterized with optical microscope, scanning electron microscope (SEM) and XRD. Corrosion behaviors were investigated by obtaining Tafel curves in an aqueous solution containing 3.5% NaCl. Mechanical properties were determined by hardness and tensile testing. While Fe-C alloy and Fe-C-Nb-V microalloyed steel without Ni typically have a ferrite-pearlite microstructure, the austenite phase has been observed in the microstructures of the alloys with 10% nickel and further. Yield and tensile strength increased with nickel content and reached the highest strength values with 13% Ni content. The addition of more nickel led to decrease the strength. Analysis of Tafel curves showed that corrosion resistance of alloys increased with increasing nickel concentration.

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Angella, Giuliano, Valentino Lupinc, Maurizio Maldini, and Giovanni Onofrio. "Comparison of High Temperature Mechanical Behaviour and Microstructure of the New Gamma–TiAl8Ta with Gamma-TiAl8Nb Alloy." Advances in Science and Technology 72 (October 2010): 40–45. http://dx.doi.org/10.4028/www.scientific.net/ast.72.40.

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The high temperature creep and fatigue properties of two  -TiAl base intermetallic alloys, for gas turbine components, have been investigated within the Integrated European project IMPRESS. The alloys contain 8% at. of Ta or Nb, respectively. The microstructure of both alloys was cross convoluted lamellar rather than the well known conventional lamellar, typical of the usual -TiAl. The microstructure of the Ta containing alloy was homogeneous in all the analyzed batches whilst that of the Nb alloy appeared significantly spread out from specimen to specimen. The creep properties of the alloys were investigated in the temperature range 700-850°C with applied stresses in order to have times to rupture up to about 3,000 h. The creep behaviour presented no steady state regimes, but only minima of the creep rates between significant decelerating and accelerating regimes. The minimum creep rates of the Ta alloy resulted to be significantly slower than the Niobium alloy at the same creep conditions. In low cycle fatigue at 650 and 700°C the Ta  -TiAl showed longer lives than the Nb alloy, whilst the fatigue crack propagation rate in the same temperature range did not show any significant difference. Threshold values of stress intensity factor range were accurately measured at different R ratio. The microstructures of the two alloys were analysed by scanning microscopy in order to rationalise the different mechanical behaviour.

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Prokhorov, D. V., V. P. Korzhov, and A. N. Nekrasov. "Influence of vanadium on microstructure and mechanical properties of layered composites based on the niobium-aluminum system obtained with use of solid-phase technology." Deformation and Fracture of Materials 10 (2020): 2–7. http://dx.doi.org/10.31044/1814-4632-2020-10-2-7.

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he microstructure and heat resistance characteristics of layered composites from Nb—V alloys and intermetallic compounds with aluminum are presented. Composites which are made by diffusion welding under pressure have structures from alternate foils of niobium doped with vanadium with 5, 10 and 15% (at.) and hardening layers of aluminum. It has been found out that the alternation of viscous-plastic layers of Nb—V alloy and hardening layers of aluminum ensures high strength of the composites at 20—1300 °С temperature, that increases when vanadium content in Nb—V alloy increases.

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39

Hajšman, Jan, Ludmila Kučerová, and Karolína Burdová. "The Influence of Varying Aluminium and Manganese Content on the Corrosion Resistance and Mechanical Properties of High Strength Steels." Metals 11, no. 9 (September 13, 2021): 1446. http://dx.doi.org/10.3390/met11091446.

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The aim of this paper is to evaluate the influence of small variations in chemical composition on the corrosion resistance and mechanical properties of low-manganese and medium manganese high strength steels. Six different steels with manganese content varying from 1.5 to 4.0 wt.% and aluminium from 0.008 to 6.5 wt.% were subjected to the analysis. The other subjects for evaluation included the effect of aluminium as a replacement for silicon, niobium microalloying and the effect of heat treatment. The effect of non-metallic inclusions on localized corrosion initiation and propagation was also documented. Using potentiodynamic testing, exposure testing, tensile and impact testing, it was found that the improvement in corrosion resistance associated with increasing aluminium content is accompanied by a significant deterioration of the mechanical properties. Niobium microalloying and heat treatment was found to have no quantifiable impact on the anti-corrosion properties. The effect of aluminium content proved to be superior to the effect of nonmetallic inclusions in terms of determining the overall corrosion resistance of the experimental steels.

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Kheirandish, Shahram, Yoosof Haaj Karim Kharrazi, and Shamseddin Mirdamadi. "Mechanical Properties of M7 High Speed Cast Steel Modified with Niobium." ISIJ International 37, no. 7 (1997): 721–25. http://dx.doi.org/10.2355/isijinternational.37.721.

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41

Chang, Yin-Yu, and Cheng-Hsi Chung. "Tribological and Mechanical Properties of Multicomponent CrVTiNbZr(N) Coatings." Coatings 11, no. 1 (January 2, 2021): 41. http://dx.doi.org/10.3390/coatings11010041.

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Multi-element material coating systems have received much attention for improving the mechanical performance in industry. However, they are still focused on ternary systems and seldom beyond quaternary ones. High entropy alloy (HEA) bulk material and thin films are systems that are each comprised of at least five principal metal elements in equally matched proportions, and some of them are found possessing much higher strength than traditional alloys. In this study, CrVTiNbZr high entropy alloy and nitrogen contained CrVTiNbZr(N) nitride coatings were synthesized using high ionization cathodic-arc deposition. A chromium-vanadium alloy target, a titanium-niobium alloy target and a pure zirconium target were used for the deposition. By controlling the nitrogen content and cathode current, the CrNbTiVZr(N) coating with gradient or multilayered composition control possessed different microstructures and mechanical properties. The effect of the nitrogen content on the chemical composition, microstructure and mechanical properties of the CrVTiNbZr(N) coatings was investigated. Compact columnar microstructure was obtained for the synthesized CrVTiNbZr(N) coatings. The CrVTiNbZrN coating (HEAN-N165), which was deposited with nitrogen flow rate of 165 standard cubic centimeters per minute (sccm), exhibited slightly blurred columnar and multilayered structures containing CrVN, TiNbN and ZrN. The design of multilayered CrVTiNbZrN coatings showed good adhesion strength. Improvement of adhesion strength was obtained with composition-gradient interlayers. The CrVTiNbZrN coating with nitrogen content higher than 50 at.% possessed the highest hardness (25.2 GPa) and the resistance to plastic deformation H3/E*2 (0.2 GPa) value, and therefore the lowest wear rate was obtained because of high abrasion wear resistance.

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Takahashi, Masashi, Equo Kobayashi, Hisashi Doi, Takayuki Yoneyama, and Hitoshi Hamanaka. "Phase Stability and Mechanical Properties of Biomedical β type Titanium-Zirconium Based Alloys Containing Niobium." Journal of the Japan Institute of Metals 64, no. 11 (2000): 1120–26. http://dx.doi.org/10.2320/jinstmet1952.64.11_1120.

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43

Xiao, L., Xin Qing Zhao, Fu Shun Liu, and Hui Bin Xu. "Mechanical Properties and Shape Memory Effects of TiNiNb Shape Memory Alloys with Low Niobium Content." Materials Science Forum 546-549 (May 2007): 2261–64. http://dx.doi.org/10.4028/www.scientific.net/msf.546-549.2261.

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Jabbar, Houria, Jean-Philippe Monchoux, Florent Houdellier, Mickael Dollé, Frank-Peter Schimansky, Florian Pyczak, Marc Thomas, and Alain Couret. "Microstructure and mechanical properties of high niobium containing TiAl alloys elaborated by spark plasma sintering." Intermetallics 18, no. 12 (December 2010): 2312–21. http://dx.doi.org/10.1016/j.intermet.2010.07.024.

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45

Skhosane, B. S., M. Tlotleng, and S. L. Pityana. "Effects of niobium (Nb) on mechanical properties of laser coated Nitinol (NiTi) used for surface modification of Ti6Al4V alloy." MRS Advances 5, no. 23-24 (2020): 1235–44. http://dx.doi.org/10.1557/adv.2020.158.

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Abstract:Laser surface treatment is widely used as an engineering technique due to its special characteristics and several advantages over other surface modification techniques. In the present study, elemental mechanically pre-alloyed powder consisting of Niobium, Titanium and Nickel was deposited onto a grade 5 Titanium alloy substrates to form a high wear resistance coating. This was such that the surface mechanical properties of the base metal can be improved. The fabricated samples were characterised using optical microscopy, scanning electron microscopy (SEM) with energy dispersive spectroscopy (EDS), Differential Scanning Calorimeter (DSC), micro hardness tester and wear machine. The deposited coatings were well bonded and consisted of various phases. Hardness was seen decrease with increase in Nb content while wear resistance increasing with increase in niobium content.

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46

Andrade-Carozzo, V., and Pascal J. Jacques. "TRIP-Assisted Multiphase Steels with Niobium Additions. Microstructures and Properties." Materials Science Forum 500-501 (November 2005): 445–52. http://dx.doi.org/10.4028/www.scientific.net/msf.500-501.445.

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It seems completely clear that the combination within the same microstructure of various steel phases (ferrite, bainite, martensite) and the existence of the TRIP effect (i.e. a mechanically induced martensitic transformation) improves in a large way the properties of strength and ductility of low-alloy steels. TRIP-aided multiphase steels have been studied for several years and arouse a growing industrial interest. This project deals with the influence of a large Nb addition on the microstructure and mechanical properties of TRIP-assisted multiphase steels. It is shown that Nb influences in a large way the different phase transformations as well as the recrystallisation of the ferrite matrix occurring during the heat-treatment of cold-rolled TRIP-aided steels. As a consequence, the mechanical properties also depend on the parameters of the thermomechanical process and on the content and stability of the retained austenite.

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47

Miller, Gordon J. "Chemistry and properties of novel niobium cluster compounds." Journal of Alloys and Compounds 229, no. 1 (October 1995): 93–106. http://dx.doi.org/10.1016/0925-8388(95)80031-x.

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48

Sharkeev, Yurii, Zhanna G. Kovalevskaya, Qi Fang Zhu, Margarita A. Khimich, and Evgeniy A. Parilov. "Investigation of the Influence of Ti-Nb Alloy Composition on the Structure of the Ingots Produced by Arc Melting." Advanced Materials Research 1085 (February 2015): 307–11. http://dx.doi.org/10.4028/www.scientific.net/amr.1085.307.

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The results of investigation of the structure, physical and mechanical properties of the Ti-Nb alloy ingots with different composition obtained by arc melting are presented. X-ray diffraction and microstructural analyses were used. Microhardness was measured and the Young’s modulus of the alloys was evaluated. When the content of niobium in the alloy changes from 10 to 40 mass.%, phase composition of the alloy varies from α-and α'-phase (10 mass.% of Nb) to α'-, α''- and β-phases (25 mass.% of Nb), to the β-phase (40 mass.% of Nb). The alloy containing 40 mass.% Nb has the lowest Young’s modulus.

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Głuchowski, W. J., Z. M. Rdzawski, J. P. Stobrawa, and K. J. Marszowski. "Microstructure and Properties of Cu-Nb Wire Composites." Archives of Metallurgy and Materials 59, no. 1 (March 1, 2014): 35–40. http://dx.doi.org/10.2478/amm-2014-0006.

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Abstract Nowadays, there is much activity all over the world in development of Cu-Nb composites for their potential use as conductors in high field magnets. This study was aimed at investigation of microstructure, mechanical and electrical properties of Cu-Nb composite wires. The investigated materials have been processed by vacuum furnace melting and casting, and then hot forging and cold drawing. Initial results of research into Cu-Nb composite material obtained using repeated iterative drawing of niobium wires compacted into copper tube, have been also presented in this article. The ultimate tensile strength versus cold deformation degree has been presented. These changes have been discussed in relation to microstructure evolution. It was assumed that repeated drawing of compacted wires is a promising method for fibrous composite production (more than 823,000 Nb fibres of nanometric diameter) characterized by high mechanical properties and electrical conductivity. Original SPD technique applied for Cu-Nb composite deformation result in initial microstructure refinement and improves effectiveness of wire production process.

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Walter, R. J., G. G. Bentle, and W. T. Chandler. "Effect of Water Vapor/Hydrogen Environments on Niobium, B-66 Niobium Alloy, Tantalum, and Ta-10W Alloy." Corrosion 47, no. 4 (April 1, 1991): 272–80. http://dx.doi.org/10.5006/1.3585255.

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Abstract The results of an experimental investigation of the effect of water vapor/hydrogen environments on the mechanical properties of niobium, B-66 niobium alloy, tantalum, and Ta-10W alloy are presented. Tensile tests were conducted on specimens of these materials in water vapor/hydrogen environments with water vapor/hydrogen mixture ratios of 1 and 3. The water vapor/hydrogen environment caused strength reductions on tantalum and Ta—WW and ductility reductions on all four materials. The degree and causes of embrittlement were a complex function of temperature.

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Journal articles on the topic 'Niobium alloys – Mechanical properties'

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