On the recrystallization behavior of homogenized AZ81 magnesium alloy: The effect of mechanical twins and γ precipitates
On the recrystallization behavior of homogenized AZ81 magnesium alloy: The effect of mechanical twins and γ precipitates
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DOI：
10.1016/j.msea.2012.07.054
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发表时间：
2012-12-15
期刊：
影响因子：
6.4
通讯作者：
Abedi, H. R.
中科院分区：
文献类型：
--
作者：
Changizian, P.;Zarei-Hanzaki, A.;Abedi, H. R.
本研究涉及均质化 AZ81 镁合金的再结晶行为，重点是机械孪晶和伽马析出物的作用。为此，在250-450摄氏度的温度范围内，在0.003、0.03和0.3 s(-1)的应变速率下进行了一组热压缩测试。结果表明，动态再结晶（DRX）已经大范围发生，因此被认为是影响相关流变应力特性的主要因素。孪晶相关的动态再结晶（包括孪晶带内的DRX和孪晶孪晶交叉处的DRX）对新再结晶晶粒的形成有很大的贡献。所得结果还证实，γ相的动态析出对阻碍新DRX晶粒的生长具有显着作用，从而导致显着的晶粒细化。机械孪晶和动态析出对合金 DRX 行为的作用分别在较高和较低的 Zener-Hollomon 参数下更为明显。 (C) 2012 Elsevier B.V. 保留所有权利。
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.