Microstructure evolution and mechanical properties of rheo-squeeze casting AZ91-Ca alloy during heat treatment

被引：0
作者：
Yang Zhang [1 ]
Xiao-ping Li [1 ]
Shun-ping Sun [1 ]
Ya-lin Lu [1 ]
Guo-hua Wu [2 ]
机构：
[1] School of Materials Engineering, Jiangsu University of Technology
[2] National Engineering Research Center of Light Alloy Net Forming, Shanghai Jiao Tong University
来源：
ChinaFoundry | 2017年 / 14卷 / 06期
基金：
中国国家自然科学基金;
关键词：
magnesium alloys; semisolid processing; heat treatment; microstructure; mechanical properties;
D O I：
暂无
中图分类号：
TG146.22 []; TG249.2 [压力铸造];
学科分类号：
080201 ; 080502 ; 080503 ;
摘要：
The rheo-squeeze casting(RSC)process is a newly-developed casting process for high-performance components.In order to further improve the mechanical properties of magnesium alloys,AZ91-2wt.%Ca(AZX912)alloy was prepared by the RSC process and then subjected to heat treatment.The microstructure evolution and mechanical properties of AZX912 alloy during heat treatment were investigated.It was found that during solid solution treatment at 410°C,β-MgAlphase with low melting point dissolves intoα-Mg matrix,while the connected network-like AlCa phase with high melting point tends to separate gradually,and the tips of AlCa phase is partially spheroidized.With the increase of solid solution time,the yield strength(YS)of AZX912 alloy decreases gradually while the ultimate tensile strength(UTS)and elongation to failure(E)increase continuously.Isothermal ageing at 225°C promotes the precipitation ofβ-MgAlphase in the matrix of AZX912 alloy.The hardness reaches the peak after ageing for 96 h and the increase in hardness is about 24.8%.The precipitation ofβ-MgAlphase during ageing treatment is beneficial to YS but harmful to E.The mechanism of microstructure evolution during heat treatment and its effect on mechanical properties are discussed.
引用
收藏
页码：485 / 491
页数：7
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