Academic literature on the topic 'Powder microstructural characterization'

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Journal articles on the topic "Powder microstructural characterization"

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Lannutti, J. J. "Characterization and Control of Compact Microstructure." MRS Bulletin 22, no. 12 (1997): 38–44. http://dx.doi.org/10.1557/s0883769400034734.

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The microstructure and properties of a ceramic component are largely predetermined by the processes and process controls used to manufacture them. The metric for success in manufacturing is often based on gross density. For example, optimizing pressure-density response, maximizing overall density, and minimizing springback and delaminations in powder pressing all focus on characterization and control of the overall (macroscopic) state of a powder compact. Unfortunately this focus on macroscopic effects has contributed to a general neglect of the compact at the microstructural level. Process-co
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Ott, J., A. Burghardt, D. Britz, S. Majauskaite, and F. Mücklich. "Qualitative and Quantitative Microstructural Analysis of Copper for Sintering Process Optimization in Additive Manufacturing Applications." Practical Metallography 58, no. 1 (2021): 32–47. http://dx.doi.org/10.1515/pm-2020-0002.

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Abstract This work will present possibilities for the characterization of copper powder green bodies and sintered copper microstructures during pressureless sintering. The introduction of new parameters to microstructural characterization based on qualitative and quantitative microstructural analysis will facilitate the systematic optimization of the sintering process. As a result of the specific evaluation of the microstructure evolution, conventional isothermal sintering could be successfully replaced by multi-step temperature profiles, thus achieving sintering densities of more than 99 % by
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Allen, Robert M., and John E. Smugeresky. "Dynamic Compaction of Rapidly Solidified Al-6%Si Powder." Proceedings, annual meeting, Electron Microscopy Society of America 43 (August 1985): 36–37. http://dx.doi.org/10.1017/s0424820100117261.

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The production of alloy powders by processes involving rapid solidification can yield powder particles which exhibit highly-refined microstructures desireable from a mechanical properties standpoint. Unfortunately, traditional methods for compacting powders into parts often cause significant coarsening of the starting powder microstructure. Alternative methods such as dynamic compaction (the shock-loading of the powder under high stresses) are under study as means of preserving the fine-scale of the starting microstructure throughout the manufacturing of a fully-dense bulk part.The purpose of
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Bhakar, Ashok, Pooja Gupta, P. N. Rao, et al. "Line profile analysis of synchrotron X-ray diffraction data of iron powder with bimodal microstructural profile parameters." Journal of Applied Crystallography 54, no. 2 (2021): 498–512. http://dx.doi.org/10.1107/s1600576721000601.

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Room-temperature synchrotron X-ray diffraction and subsequent detailed line profile analysis of Fe powder were performed for microstructural characterization. The peak shapes of the diffraction pattern of Fe were found to be super-Lorentzian in nature and the peak widths were anisotropically broadened. These peak profile features of the diffraction pattern are related to the microstructural parameters of the material. In order to elucidate these features of the diffraction pattern, detailed line (peak) profile analyses were performed using the Rietveld method, modified Williamson–Hall plots an
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Moravcik, Igor, Zuzana Kovacova, Michael Kitzmantel, Erich Neubauer, and Ivo Dlouhy. "Mechanical and Microstructural Characterization of Powder Medium Entropy Alloy." Materials Science Forum 941 (December 2018): 976–81. http://dx.doi.org/10.4028/www.scientific.net/msf.941.976.

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High and medium entropy alloys are an intriguing new material class, revered for possessing an exceptional combination of primarily mechanical properties. In this scientific contribution, the CoCrNi medium entropy alloy has been produced by a combination of mechanical alloying (MA) and spark plasma sintering (SPS). The properties have been characterized by means of X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and tensile testing. The powder after the MA process exhibited nano-grained microstructures with fine chemical homogeneity. After the SPS densification, a full density of t
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Gulsoy, H. Ozkan, Serdar Pazarlioglu, and Semih Ozbey. "Effect of Zr, Nb and Ti Additions on Injection Molded 316L Stainless Steel: Microstructural, Mechanical Properties and Corrosion Resistance." Advanced Materials Research 1119 (July 2015): 505–9. http://dx.doi.org/10.4028/www.scientific.net/amr.1119.505.

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The objective of this research is to investigate the effect of Zr, Nb and Ti additions on microstructural, mechanical and electrochemical properties of injection molded 316L stainless steel. The amount of additive powder plays a role in determining the sintered microstructure and all properties. In this study, 316L stainless steel powders used with the elemental Zr, Nb and Ti powders. The binders were completely removed from molded components by solvent and thermal debinding. The debinded samples were sintered at different temperature for 60 min. at different temperatures. Mechanical property,
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Chiang, S.-K. "Microstructural characterization of AIN sintered with Y2O3." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 578–79. http://dx.doi.org/10.1017/s0424820100104959.

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Aluminum nitride's high thermal but low electrical conductivity make it a potential ceramic packaging material. Processing history, however, can have significant effects on these properties and studies aimed at correlating them to the processing and microstructure are sparse.Pure AIN cannot be readily sintered without additives. Addition of Y2O3 significantly improves its densification behavior and the results presented here concern microstructural analysis of AIN sintered with Y2O3.High-purity AIN powder (containing 1.24% oxygen impurity) with 3 or 9 weight% Y2O3 added was sintered in N2 at 1
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Wusatowska-Sarnek, Agnieszka M., Gautam Ghosh, Gregory B. Olson, Martin J. Blackburn, and Mark Aindow. "Characterization of the microstructure and phase equilibria calculations for the powder metallurgy superalloy IN100." Journal of Materials Research 18, no. 11 (2003): 2653–63. http://dx.doi.org/10.1557/jmr.2003.0371.

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The microstructure of the Ni-based superalloy IN100 processed by a powder metallurgy route was evaluated to reveal the structures, volume fractions, distributions, and chemistries of the various phases present. These data were compared with those predicted by computational thermodynamics. It is shown that the microstructural parameters expected on the basis of global equilibrium conditions differ significantly from those measured experimentally. However, modification of these calculations by use of constrained and successive equilibria compensated for kinetic effects and led to accurate (or be
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Čelko, Ladislav, Simona Hutařová, Martin Petrenec, Karel Obrtlík, Martina Hrčková, and Tomáš Podrábský. "Microstructural Characterization of Slurry Aluminide Diffusion Coatings." Materials Science Forum 782 (April 2014): 584–89. http://dx.doi.org/10.4028/www.scientific.net/msf.782.584.

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Commercially pure aluminium powder and a mixture of aluminium and silicon powders, both in a liquid amyl acetate-based organic binder, were sprayed onto the surface of Inconel 713LC nickel base superalloy. A two-stage heat treatment process in an argon atmosphere flow was designed and applied to produce nickel aluminide diffusion coatings. Two coating systems composed of different layers with gradual changes in chemical composition and phase quantities were formed. Scanning electron microscope, scanning electron microscope/focused ion beam, both equipped with energy dispersive microanalyzers,
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Zaludin, Mohd Amin Farhan, Shamsul Baharin bin Jamaludin, Nor Maizatul Shima Adzali, and Norhamidi Muhammad. "Synthesis and Characterization of Pure Magnesium / Bio-Glass Composite." Advanced Materials Research 795 (September 2013): 51–55. http://dx.doi.org/10.4028/www.scientific.net/amr.795.51.

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In this study, bio-glass 45S5 powder was added to pure magnesium powder to produce the magnesium/bio-glass composite by powder metallurgy method. The composite was synthesized based on 5 wt. %, 10 wt. % and 15 wt. % of bio-glass. The composite was investigated from the point of view of its microstructure, physical properties and in-vitro bioactivity. Microstructural analysis showed that bio-glass was agglomerated with increasing content of bio-glass. Density and hardness of composite increased as the content of bio-glass increased. During in-vitro test, corrosion resistance increased as the co
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Dissertations / Theses on the topic "Powder microstructural characterization"

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Garcia, de la Cruz Lucia. "Ultrafine grained nickel processed by powder metallurgy : microstructure, mechanical properties and thermal stability." Thesis, Normandie, 2019. http://www.theses.fr/2019NORMC224.

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La synthèse par métallurgie des poudres de nickel à grains ultrafins (UFG) a été effectuée, et l’effet de l’affinement de la microstructure sur le comportement mécanique et les propriétés physiques a été étudié. La possibilité de coupler le broyage et le frittage flash est étudiée avec des résultats prometteurs. Des échantillons de haute densité avec des tailles de grains d = 0.65 – 4 µm, caractérisés par une fraction élevée des joints de grains Σ3 et un faible niveau de contrainte ont été synthétisés. Les propriétés mécaniques des échantillons UFG montrent une bonne combinaison ductilité-rési
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Champion, Guillaume. "Étude des relations microstructures : propriétés d'usage, de poudres fissiles d'alliages U(Mo)." Thesis, Rennes 1, 2013. http://www.theses.fr/2013REN1S118/document.

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Cette thèse participe au développement d’un combustible particulaire uranium-molybdène dans le cadre de la conversion des réacteurs de recherche de haute-performance en France et à travers le monde, à l’utilisation de combustibles faiblement enrichis (LEU : Low Enriched Uranium à opposer à HEU : High Enriched Uranium). Ce dernier se présente sous la forme d’une dispersion de particules uranifères U(Mo) dans une matrice à base d’aluminium et une question majeure persiste quant à l’interaction se produisant entre le composé U(Mo) et la matrice d’aluminium. En effet, il a été constaté que sous ce
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Boulnat, Xavier. "FAST high-temperature consolidation of Oxide-Dispersion Strengthened (ODS) steels : Process, microstructure, precipitation, properties." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0139/document.

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Ce travail vise à améliorer la compréhension de la microstructure d’aciers ferritiques appelés aciers ODS. Ils sont fabriqués par métallurgie des poudres, ce qui inclut le cobroyage d’une poudre ferritique avec une fine poudre d’oxydes, suivi d'une consolidation à haute température. La consolidation permet de former un matériau dense renforcé par des particules nanométriques qui sont responsables des bonnes propriétés mécaniques à haute température. Cependant, les procédés conventionnels, notamment la Compaction Isostatique à Chaud, provoquent des microstructures hétérogènes qui étaient jusqu’
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Gurumurthy, Ashok. "Simulation methodologies for multiphase three-dimensional microstructures." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/52261.

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There is a need for simulation methodologies for multiphase three-dimensional microstructures that can be used in numerical simulations of material behavior or in exact computation of effective properties using microstructural correlation functions. Specifically, the methodology must be able to generate verifiably realistic microstructures, with complex morphology accurately represented. Striving to address that need, the research presented here develops a general microstructure simulation toolbox for multiphase two- and three-dimensional microstructures consisting of one connected phase and
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Mazinanian, Neda. "Influence of microstructure and proteins on the metal release of micron-sized stainless steel powder particles." Thesis, KTH, Materialvetenskap, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-98082.

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Knowledge on metal release processes from stainless steel powder, which can be potentially inhaled at occupational settings, is essential within the framework of human health and environmental risk assessments. An in-depth knowledge concerning powder history, physical properties of particles (e.g. size, morphology, and active surface area) combined with their chemical properties (such as the chemical composition of the particles and their metal release behavior) is needed for better understanding of the interaction mechanisms between metal powders and humans. So far, limited in vitro and in vi
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Mart, Cody W. "Characterization and Power Scaling of Beam-Combinable Ytterbium-Doped Microstructured Fiber Amplifier." Thesis, The University of Arizona, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10621184.

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<p> In this dissertation, high-power ytterbium-doped fiber amplifiers designed with advanced waveguide concepts are characterized and power scaled. Fiber waveguides utilizing cladding microstructures to achieve wave guidance via the photonic bandgap (PBG) effect and a combination of PBG and modified total internal reflection (MTIR) have been proposed as viable single-mode waveguides. Such novel structures allow larger core diameters (>35 ?m diameters) than conventional step-index fibers while still maintaining near-diffraction limited beam quality. These microstructured fibers are demonstrated
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Mart, Cody W., and Cody W. Mart. "Characterization and Power Scaling of Beam-Combinable Ytterbium-Doped Microstructured Fiber Amplifiers." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/625641.

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In this dissertation, high-power ytterbium-doped fiber amplifiers designed with advanced waveguide concepts are characterized and power scaled. Fiber waveguides utilizing cladding microstructures to achieve wave guidance via the photonic bandgap (PBG) effect and a combination of PBG and modified total internal reflection (MTIR) have been proposed as viable single-mode waveguides. Such novel structures allow larger core diameters (>35 μm diameters) than conventional step-index fibers while still maintaining near-diffraction limited beam quality. These microstructured fibers are demonstrated as
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Tsaknopoulos, Kyle Leigh. "Computational Thermodynamic and Kinetic Modeling and Characterization of Phase Transformations in Rapidly Solidified Aluminum Alloy Powders." Digital WPI, 2019. https://digitalcommons.wpi.edu/etd-dissertations/516.

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Cold Spray is a solid-state additive manufacturing process that uses metallic feedstock powders to create layers on a substrate through plastic deformation. This process can be used for the repair of mechanical parts in the aerospace industry as well as for structural applications. Aluminum alloy powders, including Al 6061, 7075, 2024, and 5056, are typically used in this process as feedstock material. Since this process takes place all in the solid state, the properties and microstructure of the initial feedstock powder directly influence the properties of the final consolidated Cold Spray p
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Somasundaram, Aruneshwar. "Characterization of Microstructure and Mechanical Properties of Laser Powder Bed Fusion Processed Inconel 625 Alloy." University of Cincinnati / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1627658971938259.

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Tampu, Iulian Emil. "Morphological characterization of neural tissue microstructure using the orientationally-averaged diffusion MRI signal." Thesis, Linköpings universitet, Avdelningen för medicinsk teknik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-158153.

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Diffusion-weighted magnetic resonance imaging (dMRI) is a powerful tool for thecharacterisation of neural tissue microstructural features. The role of neural projectioncurvature on the diffusion signal was recently studied for three temporal regimes of the diffusion pulse sequence in search for a description of the different decay trends in the orientationally-averaged diffusion signal reported in in vivo human studies.This work experimentally investigates the effects of neural projection curvedness in one of these regimes, namely the short diffusion time regime. Multi-shell diffusion MRI acqu
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Book chapters on the topic "Powder microstructural characterization"

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Mukhopadhyay, Akash, and Probir Saha. "Microstructural Characterization of Aluminium Alloy 6061 Powder Deposit Made by Friction Stir Based Additive Manufacturing." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-5519-0_11.

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Yamada, Tetsuo, Yoshizumi Tanaka, Takeshi Suemasu, and Yasuhiko Kohtoku. "Synthesis And Characterization Of Ceramic Powders By Dual Irradiation Of CO2 And Excimer Lasers." In Ceramic Microstructures. Springer US, 1998. http://dx.doi.org/10.1007/978-1-4615-5393-9_56.

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Kang, Ho Suk, Hee Sam Kang, and Woo Young Yoon. "Microstructural Characterization of the Emulsified Cu47Ti33Zr11Ni6Sn2Si1 Alloy Powder." In Solid State Phenomena. Trans Tech Publications Ltd., 2006. http://dx.doi.org/10.4028/3-908451-25-6.623.

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Palilla, Frank C., William H. Rhodes, and Caryl S. Pitt. "The Relationships between Powder Properties, Sintered Microstructures and Optical Properties of Translucent Yttria." In Materials Characterization for Systems Performance and Reliability. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4613-2119-4_8.

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Sun, Xiao, Shouping Liu, Jun Bao, and Kai Kang. "Selective Laser Melting: Characteristics of IN718 Powder and Microstructures of Fabricated IN718 Sample." In Characterization of Minerals, Metals, and Materials 2015. John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119093404.ch4.

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Sun, Xiao, Shouping Liu, Jun Bao, and Kai Kang. "Selective Laser Melting: Characteristics of IN718 Powder and Microstructures of Fabricated IN718 Sample." In Characterization of Minerals, Metals, and Materials 2015. Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-48191-3_4.

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Gácsi, Zoltán, Tadeusz Pieczonka, Jenö Kovács, Árpád Kovács, Magdolna Szigethy, and Gábor Buza. "Characterization of Microstructure of Sintered and Laser Remelted Composites." In Materials Development and Processing - Bulk Amorphous Materials, Undercooling and Powder Metallurgy. Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527607277.ch61.

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Kretz, Ferenc, Zoltan Gacsi, and C. Hakan Gür. "Microstructure Characterization of SiCp-Reinforced Aluminum Matrix Composites by Newly Developed Computer-Based Algorithms." In Progress in Powder Metallurgy. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-419-7.909.

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Kamiya, Hidehiro, Yuichi Iida, Kenjiro Gomi, et al. "Dispersion Control and Microstructure Design of Nanoparticles by using Microbial Derived Surfactant." In Characterization, Design, and Processing of Nanosize Powders and Nanostructured Materials. John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118144077.ch7.

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Yen, Fu Su, Pei Ling Chang, Pei Ching Yu, and Rong Jeh Yang. "Characterization on Microstructure Homogeneity of θ-Al2O3 Powder Systems During Phase Transformation." In Composite Materials V. Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-451-0.81.

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Conference papers on the topic "Powder microstructural characterization"

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Nádia Alves Nery Balbino, Edmilson Otoni Correa, Lívio de Carvalho Valeriano, and Júlio Navarro Santos. "MICROSTRUCTURAL CHARACTERIZATION OF THE POWDER AND THECEMENTED CARBIDE WC-8Ni- 2Mo2C." In 23rd ABCM International Congress of Mechanical Engineering. ABCM Brazilian Society of Mechanical Sciences and Engineering, 2015. http://dx.doi.org/10.20906/cps/cob-2015-0463.

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Goh, C. S., J. Wei, and M. Gupta. "Characterization of Mg/MgO Nanocomposites Synthesized Using Powder Metallurgy Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79872.

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Magnesium nanocomposites with 0.1, 0.2, 0.3 and 0.4 volume percentages of MgO were synthesized using the powder metallurgy technique. The nanocomposite billets obtained were subsequently hot extruded at a temperature of 350 °C with an extrusion ratio of 20.25:1. The extruded nanocomposites were characterized for their microstructural, physical and mechanical properties. The microstructures of the nanocomposites showed individual particles of MgO uniformly distributed in the magnesium matrix. The thermomechanical analysis results revealed that a more thermally stable magnesium nanocomposite cou
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Wong, W. L. E., and M. Gupta. "Development of Mg/Cu Nanocomposites Using Microwave Assisted Powder Metallurgy Technique." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-79268.

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In the present study, magnesium composites containing different amount of nano-size copper particulates were successfully synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. Mg/Cu nanocomposites were sintered using a hybrid heating method consisting of microwaves and radiant heat from external susceptors. The sintered specimens were hot extruded and characterized in terms of microstructural, physical and mechanical properties. Microstructural characterization revealed minimal porosity and the presence of a continuous network of nano-size Cu pa
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Wong, W. L. E., and M. Gupta. "Development of High Performance Mg/SiC Composites Containing Nano-Size SiC Using Microwave Assisted Rapid Sintering." In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82501.

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Magnesium composites containing nano-size silicon carbide (SiC) particulates were synthesized using powder metallurgy technique coupled with a novel microwave assisted rapid sintering. The sintered specimens were hot extruded and characterized in terms of microstructural, physical and mechanical properties. Microstructural characterization revealed minimal porosity and the presence of a continuous network of nano-size SiC particulates decorating the particle boundaries of the metal matrix. Thermal mechanical analysis revealed a marginal reduction in the average coefficient of thermal expansion
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McCune, R. C., W. T. Donlon, E. L. Cartwright, A. N. Papyrin, E. F. Rybicki, and J. R. Shadley. "Characterization of Copper and Steel Coatings Made by the Cold Gas-Dynamic Spray Method." In ITSC 1996, edited by C. C. Berndt. ASM International, 1996. http://dx.doi.org/10.31399/asm.cp.itsc1996p0397.

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Abstract The Cold Gas-Dynamic Spray Method (CGSM) is a means of producing coatings or free-standing structures from powder feedstocks, on metallic, polymeric or ceramic substrates, through the use of high particle velocities obtained by the control of gas dynamics in converging-diverging nozzles. The method expands the existing temperature-velocity domain of thermal-spray technology by permitting formation of coatings at relatively low temperatures with spray patterns governed largely by the gas dynamics of the nozzle. The coatings are formed by the energetic impact of the feedstock particles,
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Salem, Hanadi G., Sherif El Eskandarany, and Hassan Abdul Fattah. "Characterization of the Consolidation Behavior of Fabricated Nanocrystalline-Nanopowders of TiC/Al-2124 Composite." In ASME 2006 Multifunctional Nanocomposites International Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/mn2006-17060.

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Nanoscale materials have been the subject of major interest in recent years due to the anticipated ultrahigh strength and toughness combination anticipated in contrast to materials with conventional meso and micro-scale structures. The key issue lays in the optimization of the processing parameters suitable for the production of bulk nanostructured materials (BNSM) with superior properties suitable for elevated and cryogenic temperature applications. In the current research, a top down approach was employed for the refinement of a micron scale Al-2124 alloy powder about 45μm in average size us
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Nai, S. M. L., J. Wei, C. K. Wong, and M. Gupta. "Enhancing the Performance of Sn-Ag-Cu Solder With the Addition of Titanium Diboride Particulates." In ASME 2004 International Mechanical Engineering Congress and Exposition. ASMEDC, 2004. http://dx.doi.org/10.1115/imece2004-60456.

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In this study, varying volume percentage of titanium diboride particulates were successfully incorporated into Sn-Ag-Cu solder, to synthesize lead-free composite solders. The composite solders were synthesized via the powder metallurgy route of: blending, compaction, sintering and extrusion. The extruded materials were then characterized for their microstructural development, thermal and mechanical properties. With increasing volume percentage of titanium diboride particulates, the composite solders experienced a corresponding decrease in density values but porosity levels were observed to inc
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Suresh, Trupti, Scott Landes, Todd Letcher, Anamika Prasad, Paul Gradl, and David Ellis. "Nanomechanical Characterization of Additive Manufactured GRCop-42 Alloy Developed by Directed Energy Deposition Methods." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23382.

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Abstract Propulsion applications such as combustion chambers and nozzles for liquid rocket engines require the use of unique materials with superior mechanical and thermal properties. GRCop-42 (Cu-4 wt.% Cr-2 wt.% Nb) is one such candidate material developed by NASA and is now being manufactured using additive manufacturing (AM) techniques. AM offers a unique processing environment different from traditional metal fabrication processes. This study characterized the mechanical and structural properties of as-deposited and heat-treated GRCop-42 manufactured with Blown Powder Directed Energy Depo
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Smith, Thale R., Chris San Marchi, Joshua D. Sugar, and Dorian K. Balch. "Effects of Extreme Hydrogen Environments on the Fracture and Fatigue Behavior of Additively Manufactured Stainless Steels." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93903.

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Abstract Additive manufacturing (AM) offers the potential for increased design flexibility in the low volume production of complex engineering components for hydrogen service. However, the suitability of AM materials for such extreme service environments remains to be evaluated. This work examines the effects of internal and external hydrogen on AM type 304L austenitic stainless steels fabricated via directed-energy deposition (DED) and powder bed fusion (PBF) processes. Under ambient test conditions, AM materials with minimal manufacturing defects exhibit excellent combinations of tensile str
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Gyekenyesi, Andrew L., Sulochana Shrestha, Manigandan Kannan, Gregory Morscher, and Onome E. Scott-Emuakpor. "Characterization of an Additively Repaired Ti-6Al-4V Alloy." In ASME Turbo Expo 2019: Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91781.

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Abstract A major disadvantage regarding integrally bladed rotors (IBRs: also referred to as blisks) is the ability to repair damage. Since it is a single part, anything beyond a minor dent requires full removal and either an expensive replacement or a complicated repair. Repair approaches gaining attention include additive metal build-up techniques such as blown powder directed energy deposition (DED). As a start and to attain confidence in such repairs, the characterization of additively modified specimens is required. The work presented here involved the tensile and fatigue testing of stock,
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