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中南大学学报(自然科学版)

Journal of Central South University

第48卷    第11期    总第279期    2017年11月

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文章编号:1672-7207(2017)11-2942-07
基于蠕变时效交互作用机理的2219铝合金统一本构建模
李喜财1, 2,湛利华1, 2

(1. 中南大学 高性能复杂制造国家重点实验室,湖南 长沙,410083; 2. 中南大学 机电工程学院,湖南 长沙,410083)

摘 要: 在不同的时效温度和试验应力条件下,对2219铝合金开展蠕变时效行为研究。随后,分别对蠕变试样进行力学性能测试和透射电镜观察,以获得该合金在蠕变时效过程中的力学性能演变规律和析出相演变规律;进一步查明材料蠕变量、析出相特征尺寸与力学性能的关系。在此基础上,建立基于成形成性耦合作用机理的2219铝合金蠕变时效本构方程,采用粒子群算法(POS)对方程中的材料常数进行拟合,并将蠕变应变和屈服强度的拟合结果与试验结果进行对比。研究结果表明:试验应力、时效温度和时效时间都会对2219铝合金的蠕变行为产生重要影响;通过提高试验应力或时效温度,可以缩短蠕变第二阶段的时间,加速蠕变第三阶段(蠕变破坏阶段)的到来。蠕变应变和屈服强度的拟合结果的相对误差分别为2.70%和0.70%。基于成形成性耦合作用机理的铝合金蠕变时效统一本构方程能够较好地反映蠕变与时效形性演变规律。

 

关键字: 2219铝合金;蠕变时效;本构建模

Unified constitutive modeling of creep aging behavior of AA2219 based on interaction of creep and aging interactive mechanism
LI Xicai1, 2, ZHAN Lihua1, 2

1. State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha 410083, China; 2. School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China

Abstract: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.

 

Key words: AA2219 alloy; creep aging; constitutive model

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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