The yield asymmetry and precipitation behavior of pre-twinned ZK60 alloy

被引：27

作者：

Chen, Hongbing ^{[1
,2
]}

Liu, Tianmo ^{[1
]}

Zhang, Yin ^{[1
]}

Song, Bo ^{[3
]}

Hou, Dewen ^{[1
]}

Pan, Fusheng ^{[1
]}

机构：

[1] Chongqing Univ, Coll Mat Sci & Engn, Chongqing 400044, Peoples R China

[2] Southwest Univ, Coll Engn & Technol, Chongqing 400716, Peoples R China

[3] Southwest Univ, Fac Mat & Energy, Chongqing 400716, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2016年 / 652卷

基金：

中国国家自然科学基金;

关键词：

Magnesium alloys; Precipitation; Twinning; Transmission electron microscopy; Yield asymmetry; ROLLED MG-3AL-1ZN ALLOY; AZ31 MG ALLOY; MAGNESIUM ALLOY; COMPRESSIVE DEFORMATION; DETWINNING DEFORMATION; TEXTURE; SEGREGATION; DEPENDENCE; BOUNDARIES; EVOLUTION;

D O I：

10.1016/j.msea.2015.11.092

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

This study aims to investigate the tension and compression properties and precipitation behavior of pre-twinned ZK60 alloys. It was found that aging treatment can effectively reduce the tension-compression yield asymmetry of pre-twinned ZK60 alloy. For the pre-twinned sample with 10 h aging treatment, the yield asymmetry ratio is nearly equal to 1. Precipitate behavior in {10-12} extension twins of ZK60 Mg alloy were characterized by TEM. Three different morphologies of precipitates, [0001](twin) rods, (0001)(twin) plates and [11-20](twin) in laths were observed in (10-12) extension twins. The precipitates constituted Mg4Zn7 or MgZn2 phases. The Mg4Zn7 phases have two variant orientations of the [010] zone axis, [010](Mg4Zn7) parallel to [0001](twin) and (- 201)(Mg4Zn7) parallel to (-12-10)(twin) or (- 201)(Mg4Zn7) parallel to (10-10)(twin), while the MgZn2 phases have an orientation of [-12-10](Mg4Zn2) parallel to [0001](twin) and (10-12)(Mg4Zn2) parallel to (10-10)(twin). [11-20](twin) laths as a new morphology of the precipitates have been found in ZK60 alloy, which have an orientation relationship of [010] (Mg4Zn7) parallel to [0001] (twin) and (-201)(Mg4Zn7) parallel to (-12-10)(twin). Finally, the influences of aging treatment on yield asymmetry of pre-twinned 2K60 alloy are addressed and discussed. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：167 / 174

页数：8

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