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Room-temperature mechanical properties of WSi_2/mosi_2 composites

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Rare Metals 2002年第4期21卷 304-307页

作者： ZHANGHouan LIUXinyu 等 InstituteofMaterialSurfaceEngineering XiangtanPolytechnicUniversityXiangtan411201China DepartmentofMaterialScienceandEngineering CentralSouthUniversityChangsha410083China Research

Five kinds of WSi_2/mosi_2 composites were successfully prepared bymechanical alloying, IP and high temperature sintering techniques. And their hardness and fracturetoughness were measured by the Vickers indentation fracture mode through an Hv-10A type *** microstructure and morphology were investigated by a JSM-56001V scanning electron *** show that the addition of 50% WSi_2 (in mole fraction) has remarkable hardening andtoughening effects on the mosi_2 matrix, whose hardness value and fracture toughness value areincreased about 60% and 86%, respectively. For WSi_2/mosi_2 composite, the hardening mechanisms arefine-grain and the second phase particles strengthening, and the toughening mechanisms includefine-grain, grain drawing, crack deflection, microbridge and bowing toughening.

关键词： mosi_2 WSi_2 hardening and toughening mechanical property

Plasticity Enhancement Processes in NiAl and mosi_2

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Journal of Materials Science & Technology 1993年第6期9卷 405-415页

作者： R.Gibala H.Chang C.M.Czarnik K.M.Edwards A.Misra Department of Materials Science and Engineering,University of Michigan,Ann Arbor,Michigan 48109-2136,USA

This paper demonstrates that plasticity enhancement processes previously observed in bcc metals and associated with the presence of surface films and precipitates or dispersoids are operative in or- dered intermetallic compounds.' Some specific results are given for NiAl-and mosi_2-based *** plasticity of NiAl and related B2 ordered alloys at room temperature during monotonic deformation can be enhanced by application of surface films such as electroless nickel ***- nificant effects are also observed during cyclic *** presence of ductile second phases such as fcc γ or the ordered phase γ' introduced by alloying also enhances the plasticity of NiAl. mosi_2 exhibits similar effects of surface films and second phases,but primarily at elevated tempera- tures,T>900℃.In this paper,we illustrate the effects of ZrO_2 surface films deposited near room temperature and TiC particulate additions introduced by powder processing *** all cases, the plasticity enhancement is associated with enhanced dislocation generation processes under the conditions of constrained deformation at the film-substrate or precipitate/dispersoid-matrix inter- face of the composite system.

关键词： plasticity ordered intermetallics NiAl mosi_2

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钼及其合金表面硅化物涂层的研究进展

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粉末冶金技术 2016年第3期34卷 228-231页

作者：廉冀琼吴艺辉张厚安付明厦门理工学院厦门市粉末冶金技术与新材料重点实验室福建厦门361024 中南大学粉末冶金研究院湖南长沙410083

钼及其合金因其具有优异的高温力学性能、高的导电导热系数和低的热膨胀系数而广泛应用于有色冶金、机械、国防和航空航天等领域。然而,由于钼及其合金高温易氧化而限制了其应用范围。mosi_2因具有优异的高温抗氧化性能,被认为是最适合... 详细信息

钼及其合金因其具有优异的高温力学性能、高的导电导热系数和低的热膨胀系数而广泛应用于有色冶金、机械、国防和航空航天等领域。然而,由于钼及其合金高温易氧化而限制了其应用范围。mosi_2因具有优异的高温抗氧化性能,被认为是最适合工程应用的高温涂层材料。本文介绍从mosi_2的性能特点、制备工艺及mosi_2涂层的研究进展三个方面综述了近年来国内外钼及其合金的硅化钼涂层防护技术,并对mosi_2涂层的未来发展方向进行了展望。

关键词：钼及其合金 mosi_2 抗氧化涂层