Effect of Cu on microstructure, mechanical properties, and texture evolution of ZK60 alloy fabricated by hot extrusion−shearing process

被引：15
作者：
DAI S. [1 ,2 ]
WANG F. [1 ,2 ]
WANG Z. [1 ,2 ]
LIU Z. [1 ,2 ]
MAO P.-L. [1 ,2 ]
机构：
[1] School of Materials Science and Engineering, Shenyang University of Technology, Shenyang
[2] Key Laboratory of Magnesium Alloys and the Processing Technology of Liaoning Province, Shenyang
来源：
Transactions of Nonferrous Metals Society of China (English Edition) | 2020年 / 30卷 / 06期
关键词：
extrusion−shearing process; mechanical properties; Mg−Zn−Cu−Zr alloy; microstructure characterization; strengthening mechanism; texture evolution;
D O I：
10.1016/S1003-6326(20)65315-8
中图分类号：
学科分类号：
摘要：
As-cast Mg−6Zn−xCu−0.6Zr (x=0, 0.5, 1.0, wt.%) alloys were fabricated by permanent mold casting; then, the alloys were subjected to homogenization heat treatment and extrusion−shearing (ES) process. The microstructure and mechanical properties of the alloys were evaluated by OM, SEM/EDS, XRD, TEM, EBSD and tensile tests. The results show that the hard MgZnCu phase in Cu-added alloy can strengthen particle-stimulated nucleation (PSN) effect and hinder the migration of dynamic recrystallization (DRX) grain boundary at an elevated temperature during ES. The ZK60+0.5Cu alloy shows an optimal tensile strength–ductility combination (UTS of 396 MPa, YS of 313 MPa, and δ=20.3%) owing to strong grain boundary strengthening and improvement of Schmid factor for {0001} basal slip. The aggregation of microvoids around the MgZnCu phase mainly accounts for the lower tensile elongation of ZK60+1.0Cu alloy compared with ZK60 alloy. © 2020 The Nonferrous Metals Society of China
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页码：1511 / 1523
页数：12
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