Effects of Cooling Rate and Component on the Microstructure and Mechanical Properties of Mg–Zn–Y Alloys  

作　　者：Shuang Shao Yong Liu Chun-Shui Xu Ying-Xuan Xu Bin Wu Xiao-Shu Zeng Xian-Feng Lu Xiang-Jie Yang 

机构地区：[1]Key Laboratory of Near Net Forming of Jiangxi Province,Nanchang University

出　　处：《Acta Metallurgica Sinica(English Letters)》2015年第1期7-14,共8页金属学报（英文版）

基　　金：financially supported by the National Natural Science Foundation of China (NO. 51464034);the Cooperation and Exchanges of Nanchang City (2012DWHZXCL@JDYTH-001);the Educational Commission of Jiangxi Province (No. GJJ13069);the Innovation Fund Designated for Graduate Students of Jiangxi Province (No. YC2013-S027);the Hong Kong Scholars Program (No. XJ2012025);the China Post-doctoral Science Foundation funded project (No. 2012T50594, 2014M551866);the Jiangxi Post-doctoral Science Foundation (No. 2014KY11);Doctoral Fund of Ministry of Education of China (No. 20113601110008)

摘　　要：The microstructure and mechanical properties of Mg–6Zn–1Y and Mg–6Zn–3Y（wt%） alloys under different cooling rates were investigated. The results show that the second dendrite arm spacing（SDAS） of Mg–6Zn–1Y and Mg–6Zn–3Y is reduced by 32 and 30% with increasing cooling rates（Rc） from 10.2 to 23 K/s, which can be predicted using a empirical model of SDAS=68 R 0：45：45cand SDAS=73 R 0c, respectively. The compressive strength of both alloys increases with increasing the cooling rate, which is attributed to the increase of volume fraction（Vf） of secondary phases under high cooling rate. The interaction of the cooling rate and component with SDAS has been theoretically analyzed using interdependence theory.The microstructure and mechanical properties of Mg–6Zn–1Y and Mg–6Zn–3Y（wt%） alloys under different cooling rates were investigated. The results show that the second dendrite arm spacing（SDAS） of Mg–6Zn–1Y and Mg–6Zn–3Y is reduced by 32 and 30% with increasing cooling rates（Rc） from 10.2 to 23 K/s, which can be predicted using a empirical model of SDAS=68 R 0：45：45cand SDAS=73 R 0c, respectively. The compressive strength of both alloys increases with increasing the cooling rate, which is attributed to the increase of volume fraction（Vf） of secondary phases under high cooling rate. The interaction of the cooling rate and component with SDAS has been theoretically analyzed using interdependence theory.

关 键 词：Mg–Zn–Y alloys Microstructural characterization Compressive strength Cooling rate Interdependence theory 

分 类 号：TG146.22[一般工业技术—材料科学与工程]