Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报(英文版)

Transactions of Nonferrous Metals Society of China

Vol. 23    No. 3    March 2013

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Rapid solidification of Cu60Co30Cr10 alloy under different conditions
Jin-bo GUO1, Chong-de CAO1, Su-lian GONG1, Rui-bo SONG1, Xiao-jun BAI1,Jian-yuan WANG1, Jian-bang ZHENG1, Xi-xing WEN

1. Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education,
Department of Applied Physics, Northwestern Polytechnical University, Xi’an 710072, China;
2. Key Laboratory for Non-equilibrium Synthesis and Modulation of Condensed Matter, Ministry of Education,Xi’an Jiaotong University, Xi’an 710049, China

Abstract:Metastable liquid phase separation and rapid solidification in a metastable miscibility gap were investigated on the Cu60Co30Cr10 alloy by using the electromagnetic levitation and splat-quenching. It is found that the alloy generally has a microstructure consisting of a (Co,Cr)-rich phase embedded in a Cu-rich matrix, and the morphology and size of the (Co,Cr)-rich phase vary drastically with cooling rate. During the electromagnetic levitation solidification processing the cooling rate is lower, resulting in an obvious coalescence tendency of the (Co,Cr)-rich spheroids. The (Co,Cr)-rich phase shows dendrites and coarse spheroids at lower cooling rates. In the splat quenched samples the (Co,Cr)-rich phase spheres were refined signi?cantly and no dendrites were observed. This is probably due to the higher cooling rate, undercooling and interface tension.

 

Key words: Cu-Co-Cr alloy; rapid solidification; metastable liquid phase separation; electromagnetic levitation; splat-quenching

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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