The effect of stress-aging on dimensional stability behavior of Al-Cu-Mg alloy
The effect of stress-aging on dimensional stability behavior of Al-Cu-Mg alloy
复制标题
应力时效对Al-Cu-Mg合金尺寸稳定性行为的影响
DOI：
10.1016/j.jallcom.2017.05.183
复制
发表时间：
2017-09-25
影响因子：
6.2
通讯作者：
Guo, L.
中科院分区：
文献类型：
--
作者：
Song, Y. F.;Ding, X. F.;Guo, L.
为了提高Al-Cu-Mg（2024铝合金）的尺寸稳定性，提出了应力时效法。研究了应力时效过程中残余应力的降低和析出相的加速。在应力时效过程中，合金中析出一定量的S′颗粒。当外加应力增加到100 MPa时，残余应力和热应变（epsilon c）减小，微屈服强度显著增加。这是由于位错被均匀分布的析出相有效地钉住，储存的弹性能显著减少，从而使2024铝合金的尺寸稳定性有了较大的提高。但当外加应力进一步增大至150 MPa时，由于析出相粗化，残余应力和热应变增大，微屈服强度略有下降。(C) 2017 Elsevier B.V.版权所有
The stress-aging method is proposed to improve the dimensional stability of Al-Cu-Mg (2024 aluminum) alloy. Both the reduction of residual stress and the acceleration of precipitates are investigated during the stress-aging process. It is observed that some S' particles precipitate in the alloy during stress-aging. With the external stress increase to 100 MPa, the residual stress and thermal strain (epsilon c) decrease, while the micro-yield strength increases significantly. This is attributed to that the dislocations are effectively pinned by the uniformly distributed precipitates and the stored elastic energy diminishes remarkably, which leads to a considerable improvement of the dimensional stability of 2024 aluminum alloy. However, when further increases the external stress to 150 MPa, due to the coarsened precipitates, the residual stress and thermal strain increase, while the micro-yield strength decreases slightly. (C) 2017 Elsevier B.V. All rights reserved.