Results 221 to 230 of about 6,107 (267)
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Alloy thermodynamics in nanostructures
Journal of Materials Research, 1994The importance of the interactions between alloy atoms and topological defects for the thermodynamic properties of nanostructured alloys is pointed out. The McLean model for grain boundary segregation is extended to yield an expression for the total Gibbs free energy of an alloy polycrystal.
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Nanostructured Bearing Alloy Studies.
1994Abstract : Work prior to this reporting period focused on achieving a more inert atmosphere for handling and consolidation of the nano-scaled steel powders. As a result, oxygen content in the nano steel powder compacts has been decreased significantly. However, even the decreased level (3% to 5%) is still too high. Further, high carbon levels (6% to 10%
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Bulk Nanostructured Multicomponent Alloys
Advanced Engineering Materials, 2001Bulk nanostructured composite materials can be obtained by partial devitrification of slowly cooled bulk glass-forming multicomponent metallic glasses or by blending a glassy matrix alloy with insoluble second-phase particles by solid state processing.
Eckert, J. +4 more
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Nanostructuring of Metals, Alloys, and Composites
2020Nanostructured metal and alloy development represented a broad frontier in the materials science research in the last two decades. The fundamental research is based on the general assumption that material properties and deformation mechanisms strongly vary as the grain size is reduced from microcrystalline regime (>1 μm) to ultrafine grain regime (1 μm–
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Nanostructure characterization of mechanical alloyed and consolidated iron alloys
Materials Science and Engineering: A, 1997High-energy ball milling (which is readily adoptable to commercial application) was used to develop sufficient quantities of nanostructured material to produce compacts capable of being measured for macroscopic properties. Characterization of the ball-milled powders show that grain boundary properties play a significant role in the overall properties ...
J. Rawers, R. Krabbe, N. Duttlinger
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Nanostructured WCCo alloy prepared by mechanical alloying
Journal of Alloys and Compounds, 1996Abstract Nanocrystalline cemented carbide powder of WCCo was directly synthesized by mechanical alloying. The structure evolution of the powders was monitored by X-ray diffraction, scanning electron microscope and thermal analysis. Results show that the formation of the compounds is controlled by an inter-diffusion reaction between elements. Powders
M.A. Xueming, J.I. Gang
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Stability of nanostructured metals and alloys
Scripta Materialia, 2004Abstract The processes controlling the microstructural evolution of very fine grain sized metallic alloys––mostly developed by plastic deformation––are briefly reviewed. Recent work on understanding the mechanisms that inhibit localized grain boundary motion by Zener and solute drag and applying this knowledge to model systems is outlined.
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Atomic mobility in nanostructured liquid Ga–In alloy
Journal of Physics: Condensed Matter, 2010Nuclear spin relaxation and the Knight shift for (71)Ga, (69)Ga, and (115)In isotopes were studied by nuclear magnetic resonance (NMR) in liquid gallium-indium alloy confined to porous glass and alloy surface film and were compared with the bulk counterparts. Drastic spin relaxation acceleration under nanoconfinement was observed for the three isotopes.
E V, Charnaya +3 more
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High-resolution nanostructural investigation of Zn4Sb3 alloys
Scripta Materialia, 2010Zinc antimonides exhibit high thermoelectric figures of merit and bear great potential for power generation. To advance the understanding of the structure–property relationship in these alloys, the microstructure of a nanocrystalline Zn_4Sb_3 alloy, containing 57.29 at.% Zn, was investigated by scanning electron microscopy and atom probe tomography ...
Gault, B. +6 more
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NANOSTRUCTURED TUNGSTEN-IRON ALLOY PREPARED BY ELECTRODEPOSITION
International Journal of Modern Physics B, 2006Tungsten-iron alloy was produced by electrodeposition. The electrodeposited alloy (15 at.% W ) possesses a two-phase composite microstructure, containing a nanocrystalline phase of distorted BCC structure with a grain size between 50 to 150 nm and an amorphous phase as the matrix. TEM in-situ annealing revealed that this composite structure was stable
Chiu, Y. L., Baluc, N., Schaeublin, R.
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