Effect of Solution Treatment on the Microstructure and Mechanical Properties of Sand-Cast Mg–9Gd–4Y–0.5Zr Alloy

被引：6

作者：

Jing-Li Li ^{[1
,2
]}

Na Zhang ^{[3
]}

Xiao-Xuan Wang ^{[3
]}

Di Wu ^{[1
]}

Rong-Shi Chen ^{[1
]}

机构：

[1] The Group of Magnesium Alloys and Their Applications,Institute of Metal Research, Chinese Academy of Sciences

[2] School of Materials Science and Engineering, University of Science and Technology of China

[3] AVIC Shenyang Liming Aero—Engine Group Corporation

来源：

Acta Metallurgica Sinica(English Letters) | 2018年 / 31卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Mg–Gd–Y–Zr alloy; Solution treatment; Microstructure; Rare-earth hydride;

D O I：

暂无

中图分类号：

TG146.22 []; TG166.4 [镁及其合金的热处理];

学科分类号：

080201 ; 080502 ; 080503 ;

摘要：

Sand-cast Mg–9Gd–4Y–0.5 Zr(wt%) alloy was solution-treated at 500–565 ℃ in the time range of 0.5–30 h in air or vacuum to investigate its microstructure evolution and mechanical properties. The results showed that solution treatment temperature had a significant influence on the dissolving rate of eutectic phase and grain growth. Taken both of them into consideration, 510–520 ℃ was considered to be the optimum solution treatment temperature range for this alloy.It should be noted that the trace(0.4–0.9 vol%) and insoluble cuboid-shaped phase precipitated during solution treatment was identified to be YH2, of which the hydrogen was thought to come from both the melting and solution heating process.In addition, the 3D morphology and dissolving process of Mg24(Gd,Y)5 eutectic phases in the as-cast alloy were also discussed via in-situ observation under X-ray tomography.

引用

页码：189 / 198

页数：10

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