Unified constitutive modeling of creep aging behavior of AA2219 based on interaction of creep and aging interactive mechanism

被引：1

作者：

Li X. ^{[1
,2
]}

Zhan L. ^{[1
,2
]}

机构：

[1] State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha

[2] School of Mechanical and Electrical Engineering, Central South University, Changsha

来源：

Zhongnan Daxue Xuebao (Ziran Kexue Ban)/Journal of Central South University (Science and Technology) | 2017年 / 48卷 / 11期

基金：

中国国家自然科学基金;

关键词：

AA2219; alloy; Constitutive model; Creep aging;

D O I：

10.11817/j.issn.1672-7207.2017.11.014

中图分类号：

学科分类号：

摘要：

The creep aging behavior of AA2219 was studied at different aging temperatures and stresses. Then, series of mechanical property tests and TEM tests were carried out to obtain the evolutions of the mechanical property and precipitate behavior. The relationship of the creep strain, the precipitates size and the mechanical properties were also investigated. Based on the experimental results, a set of unified constitutive model of AA2219 was established based on the interaction of creep and aging mechanisms. The material constants of the established model were fitted by the particle swarm optimization(POS) method. The fitted results and experimental data of creep strain and yield strength were compared. The results show that test stress, aging temperature and aging time can affect the creep behavior of AA2219 significantly. The duration of the second creep stage is shortened and the arrival of the third creep stage (the damage stage) is brought ahead when the test stress or the aging temperature increase. The relative errors of fitting results of the creep strain and yield strength are 2.70% and 0.70% separately, which shows that the unified constitutive model based on the interaction of creep forming and age hardening can be well used to describe the creep aging behavior. © 2017, Central South University Press. All right reserved.

引用

页码：2942 / 2948

页数：6

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