Investigation on microstructure characterizations and phase compositions of rapidly solidification/powder metallurgy Mg-6 wt.% Zn-5 wt.% Ce-1.5 wt.% Ca alloy

被引：14
|
作者：
Zhou, Tao [1 ]
Xia, Hua [1 ]
Yang, Mingbo [1 ]
Zhou, Zhiming [1 ]
Chen, Kang [1 ]
Hu, Jianjun [1 ]
Chen, Zhenhua [2 ]
机构：
[1] Chongqing Univ Technol, Coll Mat Sci & Engn, Chongqing 400054, Peoples R China
[2] Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2011年 / 509卷 / 09期
关键词：
Rapidly solidification/powder metallurgy; Mg-Zn-Ce-Ca alloy; Microstructure; Thermal property; UNDERCOOLED NICKEL-TIN; RARE-EARTH ALLOYS; MECHANICAL-PROPERTIES; DENDRITIC GROWTH; MAGNESIUM ALLOYS; Y ALLOYS; SYSTEM; BEHAVIOR;
D O I：
10.1016/j.jallcom.2010.12.133
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
Rapidly solidification/powder metallurgy (RS/PM) Mg-6Zn-5Ce-1.5Ca (wt.%) alloy in form of rods has been prepared by hot extrusion with RS powders, produced via atomizing the alloy melt and subsequent splat-quenching on the water-cooled copper twin-rollers. Microstructure characterizations and phase compositions of the alloy have been investigated. The results showed that the RS/PM Mg-6Zn-5Ce-1.5Ca alloy was the characteristics of very fine grains with the size ranging from 200 to 650 nm and was composed of alpha-Mg, Mg(x)Zn(y)Ce(z) phase with a few Ca (about 1 at.%) shortened as the Mg(x)Zn(y)Ce(z)-(Ca) phase, and a small quantity of Mg(51)Zn(20) phases. The melting point of the Mg(x)Zn(y)Ce(z)-(Ca) phase in the alloy was a little higher than that of the Mg(x)Zn(y)Ce(z) phase in RS/PM Mg-6Zn-5Ce alloy, which may be due to the dissolving of Ca in it. Moreover, the atomic percentage ratio of Zn to Ce in the Mg(x)Zn(y)Ce(z)-(Ca) phase around the grain boundary was close to 1.5. (C) 2010 Elsevier B.V. All rights reserved.
引用
收藏
页码：L145 / L149
页数：5
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