Influence of initial microstructure on the hot working flow stress of Mg-3Al-1Zn
Influence of initial microstructure on the hot working flow stress of Mg-3Al-1Zn
复制标题
DOI：
10.1016/j.msea.2006.02.041
复制
发表时间：
2006-05-15
期刊：
影响因子：
6.4
通讯作者：
Barnett, M. R.
中科院分区：
文献类型：
--
作者：
Beer, A. G.;Barnett, M. R.
研究了变形和扭转变形的AZ31镁合金的热加工流动应力。结果表明，热变形行为对变形条件、初始组织和变形方式十分敏感。在低应变速率和高温下，铸态材料的压缩峰值应力较高，而在高应变速率和较低温度下，细晶变形材料的压缩峰值应力较高。此外，扭转时的应力-应变曲线对峰值流动应力表现出比压缩时高得多的应变，特别是在较低温度下。最值得注意的是，在变形材料的压缩过程中，随着温度的降低和应变率的增加，应力-应变曲线的形状发生了很大的变化。从原始晶粒度、织构、孪生和动态再结晶等方面解释了变形行为的这些关键特征。(C)2006爱思唯尔B.V.保留所有权利。
The hot working flow stress is examined for wrought and as-cast magnesium alloy AZ31, deformed in both compression and torsion. It is found that the hot deformation behaviour is sensitive to the deformation conditions, initial microstructure and the deformation mode. The peak stresses in compression are higher for as-cast material at low strain rates and high temperatures, whereas they are higher for fine-grained wrought material at high strain rates and low temperatures. Also, the stress-strain curves in torsion exhibit considerably higher strains to the peak flow stress than in compression, particularly at lower temperatures. Most noticeably in the compression of the wrought material, the shape of the stress-strain curves change considerably as the temperature is reduced and the strain rate is increased. These key features of the deformation behaviour are explained in terms of initial grain size, texture, twinning and dynamic recrystallization. (c) 2006 Elsevier B.V. All rights reserved.