Effects of Y on microstructure and mechanical property of rapidly cooled Mg-6Al alloy

被引：0

作者：

Liu L. ^{[1
]}

Wang Z.-T. ^{[1
]}

Yang W. ^{[1
]}

Yu H. ^{[1
]}

Wu Z.-G. ^{[1
]}

Cai C.-C. ^{[1
]}

机构：

[1] National Defence Key Discipline Laboratory of Light Alloy Processing Science and Technology, Nanchang Hangkong University, Nanchang

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2019年 / 29卷 / 12期

基金：

中国国家自然科学基金;

关键词：

Heterogeneous nucleation; Magnesium alloy; Microstructure refinement; Rapid solidifcation; Rare earth;

D O I：

10.19476/j.ysxb.1004.0609.2019.12.03

中图分类号：

学科分类号：

摘要：

Effects of Y content on microstructure evolution and compression strength of rapidly cooled Mg-6Al alloy were investigated by injection casting into copper mould under the protection of vacuum induction melting. Both the structure and morphology of RE-rich phase were identified to reveal the refinement mechanism. The results show that the microstructure of rapidly cooled Mg-6Al alloy is significantly finer than that of the as-cast state, as indicated by the reduction of average grain size from 200 μm to 24.5 μm. Moreover, the grain morphology varies from coarse irregular petal to fine equiaxed dendrite. With the increase of Y content, the microstructure of rapidly cooled Mg-6Al alloy appears to be refined firstly and then coarsened. Square block or rod-shape Mg24Y5 phase forms in the ingot with the addition of 1%Y, which promotes heterogeneous nucleation of primary phase and is beneficial to grain refinement. Consequently, the minimum average grain size is merely 13 μm and the corresponding compression strength reaches 404 MPa. As for the sample with higher Y content, apparent agglomeration of Mg24Y5 phase occurs in Mg-6Al-1.25Y alloy, which weakens the grain refinement of rapid cooled alloy. © 2019, Science Press. All right reserved.

引用

页码：2709 / 2716

页数：7

共 22 条

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