| 1 | Phase Selection in Solidi?cation of Undercooled Co–B Alloys显示文摘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. | X.X.Wei W.Xu J.L.Kang M.Ferry J.F.Li | 2017 | Journal of Materials Science & Technology2017，33，4： | 2 |
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