Detwinning behavior of Mg-3Al-1Zn alloy at elevated temperatures

被引：25
作者：
Yu, Huihui [1 ]
Xin, Yunchang [1 ]
Zhou, Hua [1 ]
Hong, Rui [1 ]
Zhao, Lingyu [1 ]
Liu, Qing [1 ]
机构：
[1] Chongqing Univ, Sch Mat Sci & Engn, Chongqing 400044, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 617卷
基金：
中国国家自然科学基金;
关键词：
Mg alloy; Detwinning; Temperature; Twin boundary migration; WROUGHT MAGNESIUM ALLOY; LOW-CYCLE FATIGUE; STRAIN-RATE; DEFORMATION-BEHAVIOR; ROOM-TEMPERATURE; AZ31; TEXTURE; MG; MICROSTRUCTURE; FORMABILITY;
D O I：
10.1016/j.msea.2014.08.034
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
Detwinning behavior of a strongly textured magnesium alloy AZ31 at different temperatures was investigated, with a focus on the effect of temperature on twin boundaries (TBs) migration. A hot extruded Mg alloy AZ31 rod was subjected to a 3% pre-compression along the extrusion direction (ED) to generate {10 (1) over bar2} twins. Subsequent tensions along the ED at temperatures of 30 degrees C, 100 degrees C, 150 degrees C, 200 degrees C and 250 degrees C, respectively, were carried out to initiate detwinning. Mechanical behavior and microstructure evolution during detwinning deformation were examined. Our results show that the activation stress for {10 (1) over bar2} TBs migration decreases with the increasing of temperature from 30 degrees C to 250 degrees C. Even at 250 degrees C, detwinning rather than non-basal slips dominates tension along the ED of pre-strained specimens. All strain hardening curves of detwinning deformation at temperatures of 30-250 degrees C contain three stages that often appear in a {10 (1) over bar2} twinning predominant deformation. The length of Stage II is predominantly related to {10 (1) over bar2} twin volume fraction. It is found that the peak hardening rate in Stage II decreases with increased temperature. (C) 2014 Elsevier B.V. All rights reserved.
引用
收藏
页码：24 / 30
页数：7
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