Dynamic anisotropic grain growth during superplasticity in Al-Mg-Mn alloy
Dynamic anisotropic grain growth during superplasticity in Al-Mg-Mn alloy
复制标题
DOI：
10.1016/j.scriptamat.2018.02.021
复制
发表时间：
2018-05-01
影响因子：
6
通讯作者：
Sato, Eiichi
中科院分区：
文献类型：
--
作者：
Masuda, Hiroshi;Kanazawa, Takaaki;Sato, Eiichi
研究了准单相Al-Mg-Mn合金超塑性过程中动态各向异性晶粒生长的显微组织机制。延伸率为320%的拉伸超塑性是由晶界滑动介导的，晶界滑动伴随着刚性的晶粒旋转和有限的晶体滑移。变形后的试样呈双峰型微观结构。在超塑性过程中，一些晶粒保持了原来的尺寸和等轴形态，而另一些晶粒伸长了两倍以上，由沿拉伸轴排列的等轴亚晶粒组成。这些微观结构特征可能是由于晶界滑动伴随的旋转耦合晶粒聚结。(C) 2018材料学报Elsevier Ltd.出版。版权所有。
The microstructural mechanisms of dynamic anisotropic grain growth during superplasticity in a quasi-single phase Al-Mg-Mn alloy were characterized. The tensile superplasticity with 320% elongation was mediated by grain boundary sliding accompanied by rigid grain rotation with a limited crystallographic slip. The deformed sample exhibited a bimodal microstructure. Some grains maintained their original size and equiaxed morphology during superplasticity, whereas the others became elongated more than twice in aspect ratio and were composed of equiaxed subgrains that were aligned in the tensile axis. These microstructural features were possibly attributed to a rotation-coupled grain coalescence accompanied by grain boundary sliding. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.