The relationships between residual stress relaxation and texture development in AZ31 Mg alloys via the vibratory stress relief technique
The relationships between residual stress relaxation and texture development in AZ31 Mg alloys via the vibratory stress relief technique
复制标题
AZ31镁合金中通过振动时效技术实现的残余应力松弛与织构演变之间的关系
DOI：
10.1016/j.matchar.2014.09.019
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发表时间：
2015-01-01
影响因子：
4.7
通讯作者：
Wu, Weite
中科院分区：
文献类型：
--
作者：
Wang, Jia-Siang;Hsieh, Chih-Chun;Wu, Weite
利用高分辨率X射线衍射仪和便携式X射线残余应力分析仪，采用简单悬臂梁振动系统对冷轧AZ 31镁合金的残余应力松弛和织构演变进行了系统研究。研究了振动应力激发对表面残余应力分布和振动时效过程中出现的极图（0002）织构的影响。与相同合金在非振动条件下的效果相比，可以观察到表面残余应力分布均匀，应力集中区的残余压应力得到松弛，而不是所有的残余应力被消除。随着振动时效时间的延长，合金的残余压应力、织构密度和（0002）择优取向先增大后减小。应强调的是，振动时效时间超过10 min的振动应力消除工艺能够弱化AZ 31镁合金的强基底织构，这对于提高其成形性是有价值的，并且是几乎完美的3D-Debye-Scherrer环的原因。(C)2014 Elsevier Inc. All rights reserved.
A systematic study of residual stress relaxation and the texture evolution of cold-rolled AZ31 Mg alloys using the vibratory stress relief technique with a simple cantilever beam vibration system was performed using a high-resolution X-ray diffractometer and a portable X-ray residual stress analyzer. The effects of vibrational stress excitation on the surface residual stress distribution and on the texture of pole figures (0002) occurring during the vibratory stress relief were examined. Compared with the effects corresponding to the same alloy under non-vibration condition, it can be observed that the uniform surface residual stress distribution and relaxation of the compressive residual stress in the stress concentration zone were observed rather than all of the residual stresses being eliminated. Furthermore, with an increase in the vibrational aging time, the compressive residual stress, texture density, and (0002) preferred orientation increased first and then decreased. It should be underlined that the vibratory stress relief process for the vibrational aging time of more than 10 min is able to weaken the strong basal textures of AZ31 Mg alloys, which is valuable for enhancement of their formability and is responsible for an almost perfect 3D-Debye-Scherrer ring. (C) 2014 Elsevier Inc. All rights reserved.