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Reactive Milling and Mechanical Properties of NiAl Composite with HfC Dispersoids 被引量:4
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作者 FubaoYANG JiyangZHOU 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2002年第1期59-62,共4页
A NiAI-based composite with HfB2 dispersed particles has been synthesized by mechanical alloying of Ni, Al, Hf and C powders. The formation mechanism of NiAI-HfC during milling can be attributed to two chemical reacti... A NiAI-based composite with HfB2 dispersed particles has been synthesized by mechanical alloying of Ni, Al, Hf and C powders. The formation mechanism of NiAI-HfC during milling can be attributed to two chemical reactions: Ni+AI→NiAI+△H; Hf+C→HfC+△H, induced by mechanical collision in a certain period of time, which results in an abrupt exothemic reaction. Hot pressing (HP) and hot isostatic pressing (HIP) have been used to make the NiAI-10HfC compacts near fully dense. Compressive testing from room temperature to 1000℃ indicated that the yield stress of NiAI-10HfC composite is 3-4 times higher than that of cast NiAl and correspond to the MA NiAI-10TiB2 composite. In the meantime, yield strength at high temperature is dependent on strain rate, and deformation is controlled by diffusion mechanism. 展开更多
关键词 NiAl composite Hfc dispersoids Mechanical property Reactive milling micrstructure
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MICROSTRUCTURE IN LASER FUSED HIGH SPEED STEEL W6Mo5Cr4V2(M2) 被引量:2
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作者 LIU Ning CUI Kun Huazhong University of Science and Technology,Wuhan.China DENG Zonggang Hefei University of Technology,Hefei,China CHENG Benpei KONG Jie Institute of Solid State Physics,Academia Sinica,Hefei,China Doctorate student,Department of Mechanical Engineering No.2,Huazhong University of Science and Technology,Wuhan 430074,China 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 1993年第1期36-39,共4页
Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified ingot.When narrower chill zoneformed,the long columnar dendrites ... Microstructure of the deepest zone of high speed steel W6Mo5Cr4V2(M2)melt after laser fu-sion was found to be so fine as the ehill zone of a solidified ingot.When narrower chill zoneformed,the long columnar dendrites grow into the melt and then the fine equiaxed cellularstructure appears in upper melt region nearly surface.The substructure of cellular grains anddendrites was observed to consist of martensite and retained austenile,while the carbides asM_6C_■ Cr_7C_3 and MC distributed at their boundaries.It is believed that the highermicrohardness up to HV_(0.1)=865-960 of the laser fused structure of the alloy is due to the oc-currence of martensite. 展开更多
关键词 High speed steel W6Mo5Cr4V2(M2) laser fused treatment micrstructure
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