Solidification of Mg-28%Zn-2%Y alloy involving icosahedral quasicrystal phase

被引：11

作者：

Wan Di-qing ^{[1
]}

Yang Gen-cang ^{[1
]}

Man, Zhu ^{[1
]}

Quan, Xu ^{[1
]}

Zhou Yao-he ^{[1
]}

机构：

[1] Northwestern Polytech Univ, State Key Lab Solidificat Proc, Xian 710072, Peoples R China

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2007年 / 17卷 / 03期

基金：

中国国家自然科学基金;

关键词：

Mg-Zn-Y alloy; icosahedral quasicrystal; microstructure; solidification;

D O I：

10.1016/S1003-6326(07)60138-1

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

Applying XRD, DTA, SEM and TEM techniques, an investigation on the solidification microstructure and solidification sequence of Mg-rich Mg-28%Zn-2%Y (mole fraction) alloy was carried out. It is found that, a-Mg dendrites, Mg7Zn3 phase and icosahedral quasicrystal phase coexist in the as-solidified alloy, where the icosahedral quasicrystal, whose structure is indentified to be a face-centered type, originates from a peritectic reaction occurring at 416 degrees C. The primary phase of this peritectic reaction has the composition of Mg20Zn66Y14, which is coincident with the H phase reported by TSAI as (Zn, Mg)(5)Y. Furthermore, the single I-phase grain morphology was observed and its growth evolution was also discussed.

引用

页码：586 / 589

页数：4

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