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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 19    No. 3    June 2009

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Effect of predeformation on semi-solid microstructure of ZK60+RE magnesium alloy
ZHAO Zu-de(赵祖德), CHEN Qiang(陈 强), WANG Yan-bin(王艳彬), SHU Da-yu(舒大禹)

Southwest Technique and Engineering Institute, Chongqing 400039, China

Abstract:Microscopical techniques were used to provide the semi-solid microstructure evolutions of ZK60+RE alloys formed by compression and equal channel angular extrusion(ECAE), respectively. It is found that after compression and ECAE, as-cast microstructures exhibit an obvious directional characteristic. The predeformation exerts a significant influence on the formation of thixotropic microstructures during partial remelting. Coalescence and Ostwald ripening are operative in the semi-solid mixture for both compression and ECAE formed alloys. Furthermore, the degree of spheroidization of ECAE formed alloy is better than that of compression formed alloy in appearance.

 

Key words: microstructure; ZK60+RE magnesium alloy; semi-solid state; coalescence; Ostwald ripening

ISSN 1672-7029
CN 43-1423/U

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