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Journal articles on the topic 'Microstructural Mechanisms'

Author: Grafiati

Published: 4 June 2021

Last updated: 8 February 2022

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1

Li, Hui, Zhanglong Zhao, Yongquan Ning, Hongzhen Guo та Zekun Yao. "Characterization of Microstructural Evolution for a Near-α Titanium Alloy with Different Initial Lamellar Microstructures". Metals 8, № 12 (2018): 1045. http://dx.doi.org/10.3390/met8121045.

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The effects of initial lamellar thickness on microstructural evolution and deformation behaviors of a near-α Ti-5.4Al-3.7Sn-3.3Zr-0.5Mo-0.4Si alloy were investigated during isothermal compression in α + β phase field. Special attention was paid to microstructural conversion mechanisms for α lamellae with different initial thicknesses. The deformation behaviors, including flow stress, temperature sensitivity, and strain rate sensitivity, and processing maps and their dependence on initial lamellar thickness were discussed. The detailed microstructural characterizations in different domains of t

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2

Costin, Walter, Olivier Lavigne, Andrei G. Kotousov, et al. "Susceptibility of Acicular Ferrite and Upper Bainite Microstructures to Hydrogen Assisted Cold Cracking Propagation." Materials Science Forum 909 (November 2017): 44–49. http://dx.doi.org/10.4028/www.scientific.net/msf.909.44.

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Acicular ferrite (AF) and upper bainite (UB) are microstructural constituents commonly found in ferritic weld metals. Both microstructures are formed within a similar temperature range and by the same type of transformation mechanisms. They have however, substantially different morphologies and microstructural features that govern both their mechanical properties and hydrogen embrittlement susceptibility. This work shows that despite substantial microstructural differences, the mechanical properties of both microstructural constituents were quite similar. However, the microstructural differenc

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3

Zeng, Qiu Lian, Zhong Guang Wang, and J. K. Shang. "Microstructural Effects on Low Cycle Fatigue of Sn-3.8Ag-0.7Cu Pb-Free Solder." Key Engineering Materials 345-346 (August 2007): 239–42. http://dx.doi.org/10.4028/www.scientific.net/kem.345-346.239.

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Low cycle fatigue behavior of Sn-3.8Ag-0.7Cu solder was investigated under fully reversed cyclic loading, with particular emphasis on microstructural effects. The LCF behavior of the solder with equiaxed microstructure was found to differ greatly from that of the solder with a dendrite microstructure. At a given total strain amplitude, the dendrite microstructure exhibited a much longer fatigue life than the equiaxed microstructure. Such a strong microstructural effect on fatigue life arose from the difference in cyclic deformation and fracture mechanisms between the two microstructures. A lar

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4

Topping, Troy D., Ying Li, Enrique J. Lavernia, K. Manigandan, and T. S. Srivatsan. "The Influence of Processing on Microstructural Development, Tensile Response and Fracture Behavior of Aluminum Alloy 5083." Advanced Materials Research 410 (November 2011): 175–86. http://dx.doi.org/10.4028/www.scientific.net/amr.410.175.

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In this paper, the specific influence of quasi-isostatic forging and rolling of cryomilled powder on microstructural development and resultant tensile deformation and fracture behavior of aluminum alloy 5083 is highlighted and comparison made with the coarse grained counterpart. The specific influence and contribution of strain hardening to enhancing strength of the ultra-fine grain microstructure of the aluminum alloy is presented and discussed. It is shown that the capability of the ultra fine grain microstructure to recover strength through the mechanism of work hardening is quite similar t

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5

YEOM, JONG-TAEK, JEOUNG HAN KIM, JAE-KEUN HONG, NHO-KWANG PARK, and CHONG SOO LEE. "INFLUENCE OF INITIAL MICROSTRUCTURE ON HOT WORKABILITY OF Ti-6Al-4V ALLOY." International Journal of Modern Physics B 23, no. 06n07 (2009): 808–13. http://dx.doi.org/10.1142/s0217979209060063.

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Hot workability of Ti -6 Al -4 V alloy with different initial microstructures was investigated by considering processing maps and the dynamic material deformation behavior. The emphasis has been focused on the effect of initial microstructure (equiaxed versus bimodal structure). Process maps were generated using the dynamic material model (DMM), unifying the relationships between constitutive deformation behavior, hot workability and microstructures evolution. Also, the flow instability was investigated using the various flow instability criteria and microstructural analysis. To establish the

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6

Murr, L. E. "Microstructure-property hypermaps for shock-loaded materials." Proceedings, annual meeting, Electron Microscopy Society of America 44 (August 1986): 416–19. http://dx.doi.org/10.1017/s0424820100143675.

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Residual deformation-induced metallurgical effects or structure (microstructure)-property relationships are now generally well documented to be the result of stress or strain-induced microstructures, or microstructural changes in polycrystalline metals and alloys. In many cases, strain hardening, work hardening, or other controlling deformation mechanisms can be described by the generation, movement, and interactions of dislocations and other crystal defects which produce drag, or a range of impedances, including obstacles to dislocation motion.

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7

Reiter, Nina, Biswaroop Roy, Friedrich Paulsen, and Silvia Budday. "Insights into the Microstructural Origin of Brain Viscoelasticity." Journal of Elasticity 145, no. 1-2 (2021): 99–116. http://dx.doi.org/10.1007/s10659-021-09814-y.

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AbstractMechanical aspects play an important role in brain development, function, and disease. Therefore, continuum-mechanics-based computational models are a valuable tool to advance our understanding of mechanics-related physiological and pathological processes in the brain. Currently, mainly phenomenological material models are used to predict the behavior of brain tissue numerically. The model parameters often lack physical interpretation and only provide adequate estimates for brain regions which have a similar microstructure and age as those used for calibration. These issues can be over

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8

Ding, Qingqing, Hongbin Bei, Xinbao Zhao, Yanfei Gao, and Ze Zhang. "Processing, Microstructures and Mechanical Properties of a Ni-Based Single Crystal Superalloy." Crystals 10, no. 7 (2020): 572. http://dx.doi.org/10.3390/cryst10070572.

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A second-generation Ni-based superalloy has been directionally solidified by using a Bridgman method, and the key processing steps have been investigated with a focus on their effects on microstructure evolution and mechanical properties. The as-grown microstructure is of a typical dendrite structure with microscopic elemental segregation during solidification. Based on the microstructural evidence and the measured phase transformation temperatures, a step-wise solution treatment procedure is designed to effectively eliminate the compositional and microstructural inhomogeneities. Consequently,

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9

Guo, Jian Ting, Rong Shi Chen, Xing Hao Du, Gu Song Li, and Lan Zhang Zhou. "Microstructural Evolution and Deformation Mechanisms for Superplasticity of NiAl Intermetallic." Materials Science Forum 475-479 (January 2005): 2995–98. http://dx.doi.org/10.4028/www.scientific.net/msf.475-479.2995.

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The microstructural evolution during superplastic deformation of the extruded stoichiometric NiAl polycrystals were systemically investigated in various conditions of temperature, strain rate and strain by means of optical microscopy (OM) and transmission electron microscopy (TEM). Consequently, The deformation microstructures corresponding to the large tensile elongation consisted of subgrains, low angle grains as well as high angle grains, which indicated that continuous dynamic recrystallization (CDRX) process was operating during superplastic deformation.

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10

Lados, Diana A. "Fatigue Crack Propagation Mechanisms of Long and Small Cracks in Al-Si-Mg and Al-Mg Cast Alloys." Materials Science Forum 618-619 (April 2009): 563–74. http://dx.doi.org/10.4028/www.scientific.net/msf.618-619.563.

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Fatigue crack growth of long and small cracks was investigated for various Al-Si-Mg and Al-Mg cast alloys. Low residual stress was ensured during processing to concentrate on microstructural effects on crack growth. Compact tension and single edge tension specimens were fatigue crack growth tested at room temperature and stress ratio, R = 0.1. Microstructure related mechanisms were used to explain the near-threshold behaviour and crack growth response in Regions II and III for each material considering relevant microstructural features such as SDAS, grain size, and volume fraction and morpholo

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11

Abromeit, C., H. Trinkaus, and H. Wollenberger. "Mechanisms of microstructural pattern formation in irradiated solids." Canadian Journal of Physics 68, no. 9 (1990): 778–84. http://dx.doi.org/10.1139/p90-113.

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Metals and alloys under irradiation with energetic particles such as electrons, neutrons, or ions are open dissipative systems far from thermodynamic equilibrium. The continuous production, diffusion, and annihilation of point defects result in microstructural changes in the irradiated materials. Under proper conditions, self-organization of the microstructure is experimentally observed. Examples are the void lattice, periodic concentration fluctuations of dislocation loops, and irradiation-induced homogeneous precipitation in undersaturated alloys. The theoretical description rests on a coupl

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12

Kumar, Dharmesh, Sridhar Idapalapati, Wei Wang, and Srikanth Narasimalu. "Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys." Materials 12, no. 16 (2019): 2503. http://dx.doi.org/10.3390/ma12162503.

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Fatigue is a dominant failure mechanism of several engineering components. One technique for increasing the fatigue life is by inducing surface residual stress to inhibit crack initiation. In this review, a microstructural study under various bulk (such as severe plastic deformation) and surface mechanical treatments is detailed. The effect of individual microstructural feature, residual stress, and strain hardening on mechanical properties and fatigue crack mechanisms are discussed in detail with a focus on nickel-based superalloys. Attention is given to the gradient microstructure and interf

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13

Popov, Dmitry, Nenad Velisavljevic, and Maddury Somayazulu. "Mechanisms of Pressure-Induced Phase Transitions by Real-Time Laue Diffraction." Crystals 9, no. 12 (2019): 672. http://dx.doi.org/10.3390/cryst9120672.

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Synchrotron X-ray radiation Laue diffraction is a widely used diagnostic technique for characterizing the microstructure of materials. An exciting feature of this technique is that comparable numbers of reflections can be measured several orders of magnitude faster than using monochromatic methods. This makes polychromatic beam diffraction a powerful tool for time-resolved microstructural studies, critical for understanding pressure-induced phase transition mechanisms, by in situ and in operando measurements. The current status of this technique, including experimental routines and data analys

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14

Neogy, S., S. Acharya, Karri V. Mani Krishna, et al. "Texture and Microstructure Development during Swaging and Annealing Process of Fabrication of Zircaloy-4 Rod Products." Materials Science Forum 702-703 (December 2011): 830–33. http://dx.doi.org/10.4028/www.scientific.net/msf.702-703.830.

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In this study a systematic characterization of the microstructural and textural evolution in each thermo-mechanical processing step of Zircaloy-4 rod fabrication has been carried out. The possible micro-mechanisms leading to the observed microstructural evolutions have been discussed. The thermo-mechanical steps followed resulted in a completely recrystallized microstructure and retention of the hot-extruded texture in the finished product.

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15

Hénaff, Gilbert, Olivier Berteaux, Mustapha Jouiad, and Marc Thomas. "Low Cycle Fatigue and Cyclic Deformation of TiAl Alloys." Materials Science Forum 638-642 (January 2010): 1324–29. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.1324.

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The relation between microstructural parameters, microscopic cyclic deformation mechanisms and macroscopic cyclic strain hardening is investigated in the case of a heat treated PM Ti-48Al-2Cr-2Nb alloy at 20°C and at 500°C. In particular it is shown that, for the different microstructures considered, a moderate hardening is related to the formation of highly tangled dislocation structures which is in turn controlled by the dislocation glide mean free path. At 500°C this structures evolves towards a braid like structure for the fine fully lamellar microstructure.

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16

Nicoletto, Gianni, Luca Collini, Radomila Konečná, and P. Bujnová. "Strain Heterogeneity and Damage Localization in Nodular Cast Iron Microstructures." Materials Science Forum 482 (April 2005): 255–58. http://dx.doi.org/10.4028/www.scientific.net/msf.482.255.

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Fracture mechanisms of ferritic/pearlitic nodular cast iron are influenced by the heterogeneous matrix microstructure. This contribution is aimed at understanding the role of a heterogeneous matrix on the localization of damage due to mechanical loading. Therefore, bend specimens made of different nodular cast iron were plastically deformed and the degree of strain heterogeneity determined by comparison with a homogenized response. To address these observations elastic-plastic finite element models of local microstructures were developed. Computed strain maps are examined to understand the lin

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17

Gili, J. A., and E. E. Alonso. "Microstructural deformation mechanisms of unsaturated granular soils." International Journal for Numerical and Analytical Methods in Geomechanics 26, no. 5 (2002): 433–68. http://dx.doi.org/10.1002/nag.206.

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18

Molodets, A. M., V. I. Lebedev, and A. N. Dremin. "Microstructural mechanisms of spall fraction of iron." Combustion, Explosion, and Shock Waves 25, no. 4 (1990): 472–79. http://dx.doi.org/10.1007/bf00751558.

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19

Jalme, Margaux Saint, Christophe Desrayaud, Julien Favre, et al. "Microstructure Evolution during Multiaxial Processing of TA6V." Materials Science Forum 1016 (January 2021): 1211–17. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.1211.

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Subtransus multiaxial hot forging of α+β Ti-6Al-4V (TA6V) titanium alloy with a β-transformed microstructure aims at obtaining an equiaxed microstructure through α phase globularization. The activation of mechanisms involved in microstructural evolution, such as globularization, depends on parameters such as time, temperature, strain and strain rate. It is also sensitive to the crystallographic orientation of α-lamellae. As a result, multiaxial processing of titanium alloys leads to significant microstructural gradients depending on thermomechanical conditions and initial microstructure. In th

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20

Laukkanen, Anssi, Matti Lindroos, Tom Andersson, Tuukka Verho, and Tatu Pinomaa. "Micromechanical modeling of failure behavior of metallic materials." Rakenteiden Mekaniikka 50, no. 3 (2017): 271–74. http://dx.doi.org/10.23998/rm.65161.

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Microstructural and micromechanical modeling is arising as a key material modeling technique providing numerical modeling capabilities with an improved description of critical material features and mechanisms. Material characteristics such as microstructural morphologies, individual phases and defects can be included explicitly in numerical models and their significance to the material properties and performance measures of interest quantified. Similarly, mechanisms dependent on microstructural scale mechanisms such as polycrystalline plasticity can be modeled accounting for such anisotropic p

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21

Fragomeni, J. M., B. M. Hillberry, T. H. Sanders, and A. G. Gaitatzes. "Integration of Microstructural Development and Properties Design Into the CAD/CAM Environment." Journal of Engineering Materials and Technology 114, no. 1 (1992): 34–40. http://dx.doi.org/10.1115/1.2904137.

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This investigation incorporates the development and control of microstructure and properties into a computer aided design/computer aided manufacturing (CAD/CAM) environment for materials design. An integrated computer model has been developed which predicts the microstructure and properties based on the material processing and the material composition. The material processing includes the extrusion parameters and the aging conditions employed during heat treatment. The material being utilized as a demonstration medium is a special precipitation hardenable aluminum-lithium-zirconium (Al-Li-Zr)

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22

Thébault, Julien, Denis Solas, Olivier Fandeur, Thierry Baudin, and Colette Rey. "Microstructural Evolution Modelling of Nickel Base Superalloy during Forging." Materials Science Forum 636-637 (January 2010): 624–30. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.624.

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In order to obtain a better understanding of mechanisms governing the microstructural evolution of nickel base superalloys during forging, experimental and numerical studies have been undertaken. For the experimental part, isothermal compression tests were performed at 1100°C for several ratio and strain rates to reproduce microstructural evolution during industrial forging. The resulting microstructures were analysed by Electron Back Scattered Diffraction method and Transmission Electron Microscopy to identify the dynamic recrystallization mechanisms. In parallel, numerical studies has been c

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23

Tribula, D., and J. W. Morris. "Creep in Shear of Experimental Solder Joints." Journal of Electronic Packaging 112, no. 2 (1990): 87–93. http://dx.doi.org/10.1115/1.2904363.

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Thermal fatigue failures of solder joints in electronic devices are a great concern in the electronics industry. Since the fatigue load is often in shear the details of thermal fatigue failure in shear are of particular interest. Recent work indicates that similar failure mechanisms operate in both thermal fatigue in shear and unidirectional creep in shear. Additionally, since the operative temperatures during thermal fatigue represent high solder homologous temperatures, creep deformation is certainly involved. These factors and the relative case of conducting creep experiments encourage the

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24

Yamane, Gen, Vincent Velay, Vanessa Vidal, and Hiroaki Matsumoto. "Mechanical Behavior of Ti-6Al-2Sn-4Zr-2Mo Titanium Alloy under Hot and Superplastic Forming Conditions: Experiment and Modeling." Defect and Diffusion Forum 385 (July 2018): 413–18. http://dx.doi.org/10.4028/www.scientific.net/ddf.385.413.

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Titanium alloys are widely used in the aircraft industry. Under sheets form, they can be employed to the manufacturing of pylon or engine parts. With the aim of a cost reduction, this study proposes to act on the starting microstructure so as to improve the mechanical properties during the forming stages. In the present study, investigations are focused on Ti-6Al-2Sn-4Zr-2Mo (Ti6242) alloy specially used for the hot areas (e.g. parts close to the engine or the combustion chambe...). Presently, an important mechanical test campaign was performed on Ti6242 alloy, it examines, on the one hand, th

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25

Matougui, Nadjoua, Mohamed Lamine Fares, and David Piot. "Dynamic Recrystallization Mechanisms of Nickel Niobium Alloys during Hot Working." Materials Science Forum 1016 (January 2021): 869–74. http://dx.doi.org/10.4028/www.scientific.net/msf.1016.869.

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This present work examines the influence of niobium in solid solution on the microstructural evolution of pure nickel at various deformation conditions. On this purpose, high-purity nickel and six model nickel-niobium alloys (Ni–0.01, 0.1, 1, 2, 5 and 10 wt. % Nb) were subjected to hot torsion test to large strains within the temperature range from 800 to 1000 °C at strain rates of 0.03, 0.1 and 0.3 s–1. Microstructural analyses were carried out using both optical and scanning electron microscopy-based electron back-scattered diffraction technique. The overall results showed the key role playe

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26

Hussainova, Irina. "Microstructural Design of Ceramic–Metal Composites for Tribological Applications." Key Engineering Materials 334-335 (March 2007): 125–28. http://dx.doi.org/10.4028/www.scientific.net/kem.334-335.125.

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The properties, performance, and reliability of a cermet material depend mostly on the intrinsic properties influenced by microstructure that evolves during processing and use. In this study, the effect of microstructure on reliability of multiphase materials in erosive media is analyzed with reference to WC-, TiC-, and Cr3C2 - based ceramic-metal composites. Microstructure of multiphase materials, fracture mechanisms, ability of energy dissipation, thermo-mechanical parameters and erosion resistance are examined. It has been shown that microstructural variables play a very important role in c

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27

Alpe´rine, S., and L. Lelait. "Microstructural Investigations of Plasma-Sprayed Yttria Partially Stabilized Zirconia TBC (In Relation to Thermomechanical Resistance and High-Temperature Oxidation Mechanisms)." Journal of Engineering for Gas Turbines and Power 116, no. 1 (1994): 258–65. http://dx.doi.org/10.1115/1.2906802.

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This study deals with microstructural investigations of plasma-sprayed yttria partially stabilized zirconia thermal barrier coatings, performed by classical and analytical transmission electron microscopy. The aim of the study was to determine eventual relationships between coating microstructure and toughness. The ceramic/metal interface, which plays an important role during TBC thermomechanical solicitation, has also been studied. In the 6–8 wt. percent Y2O3 range, the metastable tetragonal t′ phase is observed, showing special faulted microstructural features, such as grain twinning and ant

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28

Herrera-Ramírez, J. Martin, Anthony Bunsell, and Philippe Colomban. "Microstructural Mechanisms of Fatigue Failure in PA66 Fibers." Materials Science Forum 560 (November 2007): 133–38. http://dx.doi.org/10.4028/www.scientific.net/msf.560.133.

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The behavior of two different types of ultra-high-performance polyamide (PA) 66 fibers under fatigue loading up to failure, and the correlation between the fibers (nano)structures and their structural heterogeneity with fatigue lifetimes, have been studied using scanning electron microscopy, differential scanning calorimetry, wide angle x-ray diffraction and micro-Raman spectroscopy. The role of the microstructure of the fibers in determining fatigue life is presented and the possibility of improving their resistance to fatigue or eliminating the fatigue process will be discussed.

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29

THIEL, B. L., and A. M. DONALD. "MICROSTRUCTURAL FAILURE MECHANISMS IN COOKED AND AGED CARROTS." Journal of Texture Studies 31, no. 4 (2000): 437–55. http://dx.doi.org/10.1111/j.1745-4603.2000.tb00301.x.

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30

Tavakol, M., M. Mahnama, and R. Naghdabadi. "Mechanisms Governing Microstructural Evolution During Consolidation of Nanoparticles." Materials and Manufacturing Processes 30, no. 11 (2015): 1397–402. http://dx.doi.org/10.1080/10426914.2015.1037919.

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31

Kanka, B., and H. Schneider. "Sintering mechanisms and microstructural development of coprecipitated mullite." Journal of Materials Science 29, no. 5 (1994): 1239–49. http://dx.doi.org/10.1007/bf00975071.

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32

Domack, Marcia S., Karen M. Taminger, and Matthew Begley. "Metallurgical Mechanisms Controlling Mechanical Properties of Aluminium Alloy 2219 Produced by Electron Beam Freeform Fabrication." Materials Science Forum 519-521 (July 2006): 1291–96. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.1291.

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The electron beam freeform fabrication (EBF3) layer-additive manufacturing process has been developed to directly fabricate complex geometry components. EBF3 introduces metal wire into a molten pool created on the surface of a substrate by a focused electron beam. Part geometry is achieved by translating the substrate with respect to the beam to build the part one layer at a time. Tensile properties have been demonstrated for electron beam deposited aluminum and titanium alloys that are comparable to wrought products, although the microstructures of the deposits exhibit features more typical o

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Cui, Ning, Qianqian Wu, Jin Wang, Binjiang Lv та Fantao Kong. "The Directional Solidification, Microstructural Characterization and Deformation Behavior of β-Solidifying TiAl Alloy". Materials 12, № 8 (2019): 1203. http://dx.doi.org/10.3390/ma12081203.

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A β-solidifying Ti–43Al–2Cr–2Mn–0.2Y alloy was directionally solidified by the optical floating zone melting method. The microstructure is mainly characterized by γ/α2 lamellae with specific orientations, which exhibits straight boundaries. The β phase is randomly distributed in the lamellar microstructure, indicating that the β phase cannot be directionally solidified. The directional solidification of γ/α2 lamellae was not affected by the precipitation of the β phase. Hot compression tests show that the deformation behavior of the β-containing lamellar microstructure also exhibits the anisot

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Llanes. "In-Depth Understanding of Fatigue Micromechanisms in Cemented Carbides: Implications for Optimal Microstructural Tailoring." Metals 9, no. 9 (2019): 924. http://dx.doi.org/10.3390/met9090924.

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The fatigue mechanics and mechanisms of cemented carbides (composites usually referred to as hardmetals) are reviewed. The influence of microstructure on strength lessening and subcritical crack growth for these ceramic-metal materials when subjected to cyclic loads are highlighted. The simultaneous role of the ductile metallic binder as a toughening and fatigue-susceptible agent for hardmetals results in a tradeoff between properties measured under monotonic and cyclic loading: fracture strength and toughness on one hand, as compared to fatigue strength and crack growth resistance on the othe

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Cetina, Karin Knorr. "Complex Global Microstructures." Theory, Culture & Society 22, no. 5 (2005): 213–34. http://dx.doi.org/10.1177/0263276405057200.

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The new terrorism is a major exemplifying case for complexity theory – for example, it exemplifies major disproportionalities between cause and effect, unpredictable outcomes, and self-organizing, emergent structures. It also illustrates, I argue in this article, the emergence of global microstructures: of forms of connectivity and coordination that combine global reach with microstructural mechanisms that instantiate self-organizing principles and patterns. Global systems based on microstructural principles do not exhibit institutional complexity but rather the asymmetries, unpredictabilities

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Lefebvre, Fabien, C. Revilla-Gomez, Jean Yves Buffière, Catherine Verdu, and Catherine Peyrac. "Understanding the Mechanisms Responsible for the Beneficial Effect of Hammer Peening in Welded Structure under Fatigue Loading." Advanced Materials Research 996 (August 2014): 761–68. http://dx.doi.org/10.4028/www.scientific.net/amr.996.761.

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The influence of hammer peening on the fatigue resistance of high strength welded joints of the high strength structural steel S690 has been investigated. The effect of three different parameters has been studied: geometrical effect (shape of weld tooth, roughness), microstructural effect (grain microstructure, strain-hardened depth) or residual stress effect evaluated by X-ray diffraction.

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37

Gavras, Anastasios, Anthony Spangenberger, and Diana A. Lados. "Fatigue Crack Growth in Cast and Wrought Aluminium Alloys." Materials Science Forum 765 (July 2013): 574–79. http://dx.doi.org/10.4028/www.scientific.net/msf.765.574.

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Fatigue crack growth (FCG) behaviour of cast aluminium alloys with different strengthening mechanisms (A535, 319, A356, A390) and wrought aluminium alloys (6061) was investigated in this study. Among the various parameters that can affect the propagation of fatigue cracks, the initial flaw size and microstructure were studied and correlated. Long and small FCG tests at low and high positive stress ratios were conducted on these materials in room temperature air. The mechanisms of FCG at the microstructural scale were identified and will be compared and discussed. In addition, two-parameter des

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Larzabal, Gorka, Nerea Isasti, J. M. Rodriguez-Ibabe, Isabel Gutiérrez, and P. Uranga. "Effect of the Time between Last Deformation Pass and Accelerated Cooling on the Mechanical Properties in Nb and Nb-Mo Microalloyed Steels." Key Engineering Materials 716 (October 2016): 281–90. http://dx.doi.org/10.4028/www.scientific.net/kem.716.281.

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The microstructural refinement induced when the holding time between last deformation pass and accelerated cooling is reduced, affects the mechanical properties in low carbon Nb and Nb-Mo microalloyed steels. Plane strain compression tests were performed and mechanical property samples machined in order to quantify this effect using tensile and Charpy impact tests. A complete microstructural characterization was carried out using electron backscattered diffraction (EBSD) measuring unit size distributions and homogeneity of complex microstructures. The synergetic combination of Nb and Mo elemen

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Meena, Anil, and Mohamed El Mansori. "Microstructure Induced Wear Mechanisms of PVD-Coated Carbide Tools during Dry Drilling of Newly Produced ADI." Key Engineering Materials 651-653 (July 2015): 1271–76. http://dx.doi.org/10.4028/www.scientific.net/kem.651-653.1271.

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Near-net shape austempered ductile iron (ADI) castings can be considered as a significant economic advantage to the increasing industrial demand for cost and weight efficient materials. However, due to microstructure induced inherent properties, ADI is considered as hard to machine material. The present paper thus investigates the interaction between the microstructural characteristics of ADI and wear mechanisms of PVD-coated carbide tools. The inherent properties of ADI materials are the function of its microstructural characteristics (retained austenite volume content and its carbon content,

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Li, K. W., X. B. Wang, W. X. Wang, S. M. Li, D. Q. Gong, and H. Z. Fu. "Microstructural Evolution and Compressive Properties of Two-Phase Nb-Fe Alloys Containing the C14 Laves Phase NbFe2 Intermetallic Compound." High Temperature Materials and Processes 35, no. 2 (2016): 129–34. http://dx.doi.org/10.1515/htmp-2014-0174.

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AbstractMicrostructural evolution and compressive properties of two-phase Nb-Fe binary alloys based on the C14 Laves phase NbFe2 were characterized at both the hypo- and hypereutectic compositions. The experimental results indicated that the microstructures of the two alloys consisted of fully eutectics containing Fe and NbFe2 phases at the bottom of the ingots corresponding to the largest solidification rates. With the decrease of solidification rate, the microstructures developed into primary Fe (NbFe2) dendrites plus eutectics in the middle and top parts of the ingots. The microstructural e

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Čapek, Jan, Michal Knapek, Peter Minárik, Jan Dittrich, and Kristián Máthis. "Characterization of Deformation Mechanisms in Mg Alloys by Advanced Acoustic Emission Methods." Metals 8, no. 8 (2018): 644. http://dx.doi.org/10.3390/met8080644.

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Adaptive sequential k-means (ASK) analysis of acoustic emission (AE) data was used to analyze the sources of AE during compression of three AZ31 magnesium samples with different initial texture. The results were compared to the classical hit-based approach. Observation of the deformed microstructure shows that the ASK analysis can distinguish very well between the signal originating in deformation twinning and dislocation slip. Moreover, together with microstructural analysis, the ASK algorithm revealed another source of AE for one of the samples, which was shown to be the double twinning.

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Gutierrez-Urrutia, Ivan, Cheng Lin Li, Xin Ji, Satoshi Emura, and Koichi Tsuchiya. "Twinning and Detwinning Mechanisms in Beta-Ti Alloys." Materials Science Forum 941 (December 2018): 821–26. http://dx.doi.org/10.4028/www.scientific.net/msf.941.821.

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We have investigated {332}<113> twinning and detwinning mechanisms in β-Ti alloys. Microstructure-twinning relations were evaluated in a β-Ti-15Mo (wt.%) alloy by statistical analysis of the evolving twin structure upon deformation by in-situ SEM testing and electron backscattering diffraction (EBSD). We find that most of the primary twins (~80%) correspond to the higher stressed variant and follow Schmid’s law with respect to the macroscopic stress. Detwinning mechanism was evaluated in a multilayered β-Ti-10Mo-xFe (x: 1-3 wt.%) by EBSD. We find that the detwinning process consists of t

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Thambyah, Ashvin, V. M. van Heeswijk, C. C. van Donkelaar, and Neil Broom. "A Microstructural Study of Load Distribution in Cartilage: A Comparison of Stress Relaxation versus Creep Loading." Advances in Materials Science and Engineering 2015 (2015): 1–11. http://dx.doi.org/10.1155/2015/952879.

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The compressive response of articular cartilage has been extensively investigated and most studies have focussed largely on the directly loaded matrix. However, especially in relation to the tissue microstructure, less is known about load distribution mechanisms operating outside the directly loaded region. We have addressed this issue by using channel indentation and DIC microscopy techniques that provide visualisation of the matrix microstructural response across the regions of both direct and nondirect loading. We hypothesise that, by comparing the microstructural response following stress

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de Jeer, Leo T. H., Václav Ocelík, and Jeff T. M. De Hosson. "Orientation Relationships in Al0.7CoCrFeNi High-Entropy Alloy." Microscopy and Microanalysis 23, no. 5 (2017): 905–15. http://dx.doi.org/10.1017/s1431927617012442.

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AbstractA detailed microstructural evaluation was executed on the crystallographic texture as well as the mechanisms for nucleation, phase transformation, and grain growth in a Al0.7CoCrFeNi high-entropy alloy. The microstructure and crystallographic orientations were characterized by electron backscatter diffraction, and the chemical composition variations by energy-dispersive X-ray spectroscopy. The cast Al0.7CoCrFeNi alloy started in the BCC phase and partially transformed into the FCC phase. It was found that the Pitsch orientation relationship (OR) dominates the nucleation mechanism of th

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Wang, Xin, Yi Xia Zhang, and Yu Hong Cui. "Evaluation of Dentinal Viscoelastic Properties Based on its Microstructural Characters." Advanced Materials Research 32 (February 2008): 229–32. http://dx.doi.org/10.4028/www.scientific.net/amr.32.229.

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On the basis of the characters of dentinal microstructures, a new Three-Parameter-Solid viscoelastic mechanics model which can predict strain creep, stress relaxation and instant elasticity with anisotropic constitutive relation for the human dentin is developed in this paper. The porous protein-mineral model is adopted to obtain the independent dentinal viscoelastic moduli based on its microstructural characters. The influencing mechanisms and the viscoelastic properties of the microstructural dentin are also evaluated by the Three-Parameter-Solid viscoelastic model. The viscoelastic predicti

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Baudín, Carmen, Ali Sayir, and Marie Helene Berger. "Failure Mechanisms in Directionally Solidified Alumina-Titania Composites." Key Engineering Materials 290 (July 2005): 199–202. http://dx.doi.org/10.4028/www.scientific.net/kem.290.199.

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The mechanical properties of directionally solidified two-phase eutectics can be superior to that of either constituent alone due to the strong constraining effects of the interlocking microstructure. The present work focuses on the failure mechanisms that occur in Al2O3-Al2TiO5 composites fabricated by directional solidification. Two compositions rich in alumina have been considered. The constituents were the same in both materials, primary Al2O3 dendrites surrounded by a TiO2-containing phase, with different morphological and size characteristics. The dendrites in the material containing the

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Tekumalla, Sravya, Wei Yang, and Manoj Gupta. "Using Micro-Alloying (0.5Zr-0.4Ce) to Significantly Enhance Hardness, Tensile and Compressive Response of Magnesium." Materials Science Forum 928 (August 2018): 177–82. http://dx.doi.org/10.4028/www.scientific.net/msf.928.177.

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A ternary micro Mg-0.5Zr-0.4Ce alloy is developed using disintegrated melt deposition method (DMD) followed by hot extrusion. The developed alloy exhibited superior mechanical properties i.e. microhardness, strength and ductility under tensile and compressive loading. In particular, the alloy exhibits excellent ductility (>25%) under both tensile and compressive loading. The mechanisms leading to strengthening and ductilization were examined through microstructural studies involving optical microscope, SEM and XRD texture analysis. Microstructure-property correlation studies are performed t

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Grützmacher, P., C. Gachot, and S. J. Eder. "Visualization of microstructural mechanisms in nanocrystalline ferrite during grinding." Materials & Design 195 (October 2020): 109053. http://dx.doi.org/10.1016/j.matdes.2020.109053.

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McQueen, H. J., Q. S. Zhu, and Wolfgang Blum. "Energy Dissipation Efficiency Analysis and Microstructural Mechanisms in Aluminum." Materials Science Forum 217-222 (May 1996): 601–4. http://dx.doi.org/10.4028/www.scientific.net/msf.217-222.601.

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Vukmanovic, Z., M. L. Fiorentini, S. M. Reddy, and B. Godel. "Microstructural constraints on magma emplacement and sulfide transport mechanisms." Lithosphere 11, no. 1 (2018): 73–90. http://dx.doi.org/10.1130/l743.1.

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