期刊
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
卷 214, 期 4, 页码 775-783出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jmatprotec.2013.08.017
关键词
Al-Zn-Mg-Cu alloy; Simulated age-forming; Stress relaxation; Threshold stress; Thermal activation energies
资金
- Natural Science Foundation of China [51171051]
The stress relaxation behavior of age-forming for an Al-Zn-Mg-Cu alloy was studied using a designed device that can simulate the age forming process. The mechanism of stress relaxation was also revealed through calculating thermal activation parameters and analyzing the microstructures. The results suggested that the stress relaxation behavior of the Al-Zn-Mg-Cu alloy in the simulated age-forming process can be divided into three stages according to the stress level. The three stages of stress relaxation are: (i) the initial high stress stage, (ii) the subsequent middle stress transition stage and (iii) the last low stress equilibrium stage, respectively. The deformation activation energies are 132 kJ/imol in the initial high stress stage, 119 kJ/mol in the subsequent middle stress transition stage and 91 kJ/mol in the last low stress equilibrium stage, respectively. The analysis of the thermal activation parameters and microstructures revealed that dislocation creep was the dominant deformation mechanism in the initial and subsequent stages of the stress relaxation; whereas diffusion creep is the mechanism in the last stage of the stress relaxation. Additionally, a special threshold stress phenomena was present in the stress relaxation of the age-forming process, which was scribed to the interaction between precipitation and dislocation in the Al-Zn-Mg-Cu alloy (C) 2013 Elsevier B.V. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据