Microstructure, mechanical properties and fracture behaviors of large-scale sand-cast Mg-3Y-2Gd-1Nd-0.4Zr alloy

被引：0

作者：

Lixiang Yang ^{[1
,2
,3
]}

Yuanding Huang ^{[2
]}

Zhengquan Hou ^{[3
]}

Lv Xiao ^{[3
]}

Yuling Xu ^{[3
]}

Xiwang Dong ^{[3
]}

Fei Li ^{[1
]}

Gerrit Kurz ^{[4
]}

Baode Sun ^{[1
]}

Zhongquan Li ^{[1
,3
]}

Norbert Hort ^{[2
]}

机构：

[1] Shanghai Key Lab of Advanced High-temperature Materials and Precision Forming and State Key Lab of Metal Matrix Composites, School of Materials Science and Engineering, Shanghai Jiao Tong University

[2] MagIC-Magnesium Innovation Centre and Institute of Metallic Biomaterials, Helmholtz-Zentrum Hereon

[3] Shanghai Spaceflight Precision Machinery Research Institute

[4] Institute of Material and Process Design, Helmholtz-Zentrum Hereon

来源：

Journal of Magnesium and Alloys | 2023年 / 08期

基金：

中国国家自然科学基金;

关键词：

D O I：

暂无

中图分类号：

TG146.22 [];

学科分类号：

080502 ;

摘要：

In order to improve the ductility of commercial WE43 alloy and reduce its cost, a Mg-3Y-2Gd-1Nd-0.4Zr alloy with a low amount of rare earths was developed and prepared by sand casting with a differential pressure casting system. Its microstructure, mechanical properties and fracture behaviors in the as-cast, solution-treated and as-aged states were evaluated. It is found that the aged alloy exhibited excellent comprehensive mechanical properties owing to the fine dense plate-shaped β’ precipitates formed on prismatic habits during aging at 200 ℃ for 192 hrs after solution-treated at 500 ℃ for 24 hrs. Its ultimate tensile strength, yield strength, and elongation at ambient temperature reach to 319 ± 10 MPa, 202 ± 2 MPa and 8.7 ± 0.3% as well as 230 ± 4 MPa, 155 ± 1 MPa and 16.0 ± 0.5% at 250 ℃. The fracture mode of as-aged alloy was transferred from cleavage at room temperature to quasi-cleavage and ductile fracture at the test temperature 300 ℃.The properties of large-scale components fabricated using the developed Mg-3Y-2Gd-1Nd-0.4Zr alloy are better than those of commercial WE43 alloy, suggesting that the new developed alloy is a good candidate to fabricate the large complex thin-walled components.

引用

页码：2763 / 2775

页数：13

共 24 条

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