Microstructures and properties of rapidly solidified Mg-Zn-Ca alloys

被引：26
|
作者：
Zhou Tao [1 ]
Chen Ding [1 ]
Chen Zhen-hua [1 ]
机构：
[1] Hunan Univ, Sch Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2008年 / 18卷
关键词：
Mg-Zn-Ca alloy; rapid solidification; microstructure; micro-hardness;
D O I：
10.1016/S1003-6326(10)60183-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Ternary alloys based on the Mg-Zn-Ca system were produced by twin-roll rapid solidification. The alloys were characterized by OM, SEM, HRTEM, XRD, EDS and Micro-hardness. The results show that the rapidly solidified flakes are of fine dendritic cell structures with the cell size ranging from 1 to 5 mu m. The Mg-6Zn-5Ca alloy in RS and annealing (200 degrees C for 1 h) states are mainly composed of alpha-Mg, Mg2Ca, Ca2Mg6Zn3 and a small quantity of Mg51Zn20, MgZn2 and Mg2Zn3. Micro-hardness increases with the increment of Ca content and age hardening occurs after aging at 200 degrees C in the flakes probably due to the precipitation strengthening of the fine precipitates Mg2Ca and Ca2Mg6Zn3, Some phases at the grain boundary in Mg-6Zn-5Ca alloy are identified by means of HRTEM, which may be beneficial to the improvement in thermal stability of the alloy.
引用
收藏
页码：S101 / S106
页数：6
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