Suppression of grain boundary migration at cryogenic temperature in an extremely fine nanograined Ni-Mo alloy

查看全文 作　　者：[1,2]J.Hu;[1,3]J.X.Li;Y.-[1]N.Shi

机构地区：[1]Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016,China;[2]Institute of Advanced Materials,East China JiaoTong University,Nanchang 330013,China;[3]School of Materials Science and Engineering,University of Science and Technology of China,Hefei 230026,China

出　　处：《Journal of Materials Science & Technology》索引2020年第54卷第22期,共5页

基　　金：financially supported by the Ministry of Science & Technology of China (No. 2017YFA0204401);the National Natural Science Foundation of China (Nos. ZDYZD201701, 51961012 and 51801064);the Jiangxi Outstanding Young Talents Funding Program (No. 20192BCB23014);the Liaoning Revitalization Talents Program (No. XLYC1808008);the Shenyang National Laboratory for Materials Science (No. 2016RP05)。 摘　　要：Microindentation creep tests on an electrodeposited extremely fine(4.9 nm) nanograined(ng) Ni-14.2 at.% Mo(Ni-14.2 Mo) at both room temperature(RT) and liquid nitrogen temperature(LNT) demonstrated that lowering temperature retarded softening in the ng Ni-Mo alloy. The obtained strain rate sensitivity at LNT was one order of magnitude lower than that at RT. Microstructural characterization revealed that mechanically-driven grain boundary(GB) migration was greatly suppressed by lowering temperature,which might be ascribed to the presence of solute Mo atoms that significantly retarded coupled GB motion at LNT. Deformation was instead carried by shear bands. 关键词：Extremely fine nanograined metals Mechanically-driven grain boundary migration Cryogenic temperature Shear bands Solute atoms

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Suppression of grain boundary migration at cryogenic temperature in an extremely fine nanograined Ni-Mo alloy

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