Composition optimization of high-strength Mg-Gd-Y-Zr alloys based on the structural unit of Mg-Gd solid solution

被引：13

作者：

Rui Jiang ^{[1
]}

Shengnan Qian ^{[1
]}

Chuang Dong ^{[1
,2
]}

Ying Qin ^{[1
]}

Yujuan Wu ^{[3
]}

Jianxin Zou ^{[3
]}

Xiaoqin Zeng ^{[3
]}

机构：

[1] Key Laboratory of Materials Modification (Ministry of Education), School of Material Science and Engineering, Dalian University of Technology

[2] School of Materials Science and Engineering, Dalian Jiaotong University

[3] National Engeering Research Center of Light Alloys Net Forming, School of Material Science and Engineering, Shanghai Jiao Tong University

来源：

Journal of Materials Science & Technology | 2021年 / 72卷 / 13期

关键词：

Mg-Gd solid solution; Chemical unit; Cluster-plus-glue-atom unit; Mg-Gd-Y-Zr cast alloys;

D O I：

暂无

中图分类号：

TG146.22 [];

学科分类号：

080502 ;

摘要：

Mg-Gd-Y-Zr alloys with high strength fall within narrow composition range.The present paper explains their composition rule by establishing the cluster-plus-glue-atom unit of Gd-containing Mg solid solution with the aid of Mg matrix and Mg5Gd precipitate phase.First,based on the structural homologue between Gd-containing Mg solid solution and Mg5Gd precipitate phase and in combination with our previously established method for calculating the glue atoms,[Gd-Mg12]Mg5is obtained as the chemical unit of Gd-containing Mg solid solution.Then,seven compositions are designed using different combinations of this unit and that of pure Mg [Mg-Mg12Mg3.After a systematic experimental investigation on the microstructure and mechanical property evolutions as a function of the unit proportions,it is revealed that the Mg-10.1 Gd-3.3 Y-0.9 Zr alloy,being issued from equi-proportion mixing of the two units,shows the strongest tendency of precipitation and reaches the highest strength of 374 MPa after aging.The composition and strength of this alloy are quite close to GW103 K which is well recognized for its general mechanical performance in Mg-Gd-Y-Zr system.

引用

页码：104 / 113

页数：10

共 15 条

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