On the recrystallization behavior of homogenized AZ81 magnesium alloy: The effect of mechanical twins and γ precipitates

被引：81
作者：
Changizian, P. [1 ]
Zarei-Hanzaki, A. [1 ]
Abedi, H. R. [1 ]
机构：
[1] Univ Tehran, Coll Engn, Sch Met & Mat Engn, Tehran, Iran
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2012年 / 558卷
关键词：
Mechanical characterization; Magnesium alloys; Thermomechanical processing; Recrystallization; Twinning; Precipitation; SEVERE PLASTIC-DEFORMATION; HIGH-TEMPERATURE DEFORMATION; A356; ALUMINUM-ALLOY; AZ31 MG ALLOY; DYNAMIC RECRYSTALLIZATION; FLOW BEHAVIOR; HOT DEFORMATION; MICROSTRUCTURE; CAST; TEXTURE;
D O I：
10.1016/j.msea.2012.07.054
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The present study deals with the recrystallization behavior of homogenized AZ81 magnesium alloy with emphasizing on the role of mechanical twins and gamma precipitates. Towards this end a set of hot compression tests were conducted in the temperature range of 250-450 degrees C under strain rates of 0.003, 0.03 and 0.3 s(-1). The results indicate that the dynamic recrystallization (DRX) has been occurring in the large scales thereby considered as the main factor affecting the related flow stress characteristics. The twin related dynamic recrystallization (including DRX within twin bands and DRX at twin-twin intersections) possesses a great contribution to the formation of new recrystallized grains. The obtained results also confirm that the dynamic precipitation of gamma phase has a significant effect on hindering the growth of new DRX grains thereby resulting in an outstanding grain refinement. The role of mechanical twinning and dynamic precipitation on the DRX behavior of the alloy is more pronounced at higher and lower Zener-Hollomon parameter, respectively. (C) 2012 Elsevier B.V. All rights reserved.
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收藏
页码：44 / 51
页数：8
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