A coupled EBSD/TEM study of the microstructural evolution of multi-axial compressed pure Al and Al-Mg alloy
A coupled EBSD/TEM study of the microstructural evolution of multi-axial compressed pure Al and Al-Mg alloy
复制标题
多轴压缩纯铝和铝镁合金显微组织演化的 EBSD/TEM 耦合研究
DOI：
10.1016/j.msea.2016.01.080
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发表时间：
2016-03-21
期刊：
影响因子：
6.4
通讯作者：
Song, Min
中科院分区：
文献类型：
--
作者：
Yang, Xiaohui;Wang, Degao;Song, Min
采用透射电镜（TEM）和EBSD技术研究了多轴压缩（MAC）对纯Al和Al- 4wt % Mg合金组织演变的影响。结果表明，高浓度溶质Mg的加入改变了Al的晶粒细化过程。最重要的是，纯Al和Al-4 wt%Mg合金通过不同的机制形成了新的高角度晶界：纯Al的取向分裂，低应变下的剪切带和Al-4 wt%Mg合金的取向分裂。此外，在变形过程中，溶质Mg会阻碍位错滑移，延缓动态恢复。结果表明，Al-4 wt%Mg合金的取向偏差演化速度较纯Al慢，且在硬度和显微组织演化方面与纯Al存在明显差异。(C) 2016 Elsevier B.V.版权所有
The effects of multi-axial compression (MAC) on the microstructural evolution of pure Al and Al-4 wt% Mg alloy were investigated by means of TEM and EBSD techniques. It shows that the addition of high concentration solute Mg to Al changes the grain refinement process. Most importantly, new high-angle grain boundaries form via different mechanisms for pure Al and Al-4 wt%Mg alloy: orientation splitting for pure Al and shear banding at low strain and orientation splitting at high strain for Al-4 wt%Mg alloy. In addition, the solute Mg can hinder the dislocation slip and retard the dynamic recovery during the deformation process. Consequently, the Al-4 wt%Mg alloy exhibits a slower misorientation evolution compared to pure Al, and obvious differences in hardness and microtexture evolution exist between pure Al and Al-4 wt%Mg alloy. (C) 2016 Elsevier B.V. All rights reserved.