Phase Selection in Solidi?cation of Undercooled Co–B Alloys

查看全文 作　　者：[1]X.X.Wei;[2]W.Xu;[1]J.L.Kang;[2]M.Ferry;[1]J.F.Li

机构地区：[1]State Key Laboratory of Metal Matrix Composites,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240.China;[2]Australian Research Council Centre of Excellence for Design in Light Metals,School of Materials Science and Engineering,The University of New South Wales,Sydney,NSW 2052,Australia

出　　处：《Journal of Materials Science & Technology》索引2017年第33卷第4期,共7页

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.51227001 and 51471108);the SJTU-UNSW Cooperative Research Fund(16X120030005) 摘　　要：A series Co-(18.5–20.7) at.% B melts encompassing the eutectic composition(Co81.5B18.5) were solidi?ed at different degrees of undercooling. It is found that the metastable Co23B6 phase solidi?es as a substitute for the stable Co3 B phase in the alloy melts undercooled above a critical undercooling value of ~60 K.The Co23B6 and α-Co phases make up a metastable eutectic. The corresponding eutectic composition and temperature are Co80.4B19.6 and 1343 K, respectively. On exposure of the metastable Co23B6 phase at a given temperature above 1208 K, it does not decompose even after several hours. But it transforms by a eutectoid reaction to α-Co + Co3 B at lower temperature. 关键词：UNDERCOOLING Rapid solidification Metastable phase diagram Structure evolution

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Phase Selection in Solidi?cation of Undercooled Co–B Alloys

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