Microstructure and phase transformation of as-cast and annealed Mg-4Zn-1Y alloy containing quasi-crystal phase

被引：14
|
作者：
Yang, Yang [1 ]
Zhang, Kui [1 ]
Li, Xing-Gang [1 ]
Li, Yong-Jun [1 ]
Ma, Ming-Long [1 ]
Shi, Guo-Liang [1 ]
Yuan, Jia-Wei [1 ]
机构：
[1] Gen Res Inst Nonferrous Met, State Key Lab Fabricat & Proc Nonferrous Met, Beijing 100012, Peoples R China
来源：
RARE METALS | 2015年 / 34卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Mg-Zn-Y alloy; Heat treatment; Microstructure; Phase transformation; Icosahedral quasi-crystal; ZN-Y ALLOYS; MECHANICAL-PROPERTIES; EXTRUSION; NACL;
D O I：
10.1007/s12598-014-0443-8
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
By means of optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM) analyses, the microstructures of as-cast and heat-treated Mg-4Zn-1Y (wt%) alloy containing quasi-crystal phase were studied. The microstructure of the as-cast alloy consists of alpha-Mg solid solution grains, intermetallic particles and eutectic phases (W-phase and I-phase), and huge grains with serious dendritic segregation are clearly observed. After heat treatment, phase transformation and dissolution occur in the alloy and many phases remain. When the alloy was treated above 410 A degrees C, the eutectic phases transform into spherical shape as the I-phase turns to W-phase. After heat treatment for long time, the alloy is over burnt and the W-phase decomposes to Mg-Y binary phase.
引用
收藏
页码：239 / 244
页数：6
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