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Volume 9
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10.3390/met9111215
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Article

Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains

by
Yixian Cai
1,2,
Lihua Zhan
1,2,3,*,
Yongqian Xu
2,3,*,
Chunhui Liu
2,3,
Jianguang Wang
4,
Xing Zhao
2,3,
Lingzhi Xu
2,3,
Canyu Tong
2,3,
Gengquan Jin
2,3,
Qing Wang
2,3,
Lan Hu
4 and
Minghui Huang
2,3
1
Light Alloy Research Institute of Central South University, Changsha 410083, China
2
State Key Laboratory of High-Performance Complex Manufacturing, Central South University, Changsha 410083, China
3
School of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
4
Shanghai Aerospace Equipment Manufacturing Co., Ltd., Shanghai 200245, China
*
Authors to whom correspondence should be addressed.
Metals 2019, 9(11), 1215; https://doi.org/10.3390/met9111215
Submission received: 21 September 2019 / Revised: 5 November 2019 / Accepted: 7 November 2019 / Published: 12 November 2019
(This article belongs to the Special Issue Metal Plasticity and Fatigue at High Temperature)
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Abstract

Age forming is an advanced manufacture technology for forming large aluminum panels. Temperature, initial stress level and pre-strains have a great effect on the formability and performance. The stress relaxation aging behavior of AA7150-T7751 under different temperatures, initial stress levels and pre-strains was studied through stress relaxation tests, tensile tests and TEM observations. The results show that the formability can be improved with the increase of temperature, initial stress levels and pre-strains. Deformation mechanisms during stress relaxation of the material were analyzed on the basis of creep stress exponent and apparent activation energy. The aging precipitates of the studied alloy were not sensitive to the age forming conditions, but drastically coarsened at over aging temperature, which decreased the mechanical properties. In addition, the relationship between stress relaxation behavior and aging strengthening is discussed. Based on the dislocation theory and the modified Arrhenius equation, a stress relaxation constitutive equation considering the initial mobile dislocation density and temperature dependent activation energy was established. This model can predict very well the stress relaxation behavior under various temperature, stress level and pre-strain conditions, with an average error of 2%.
Keywords: stress relaxation aging behavior; pre-strain; initial stress levels; temperature; constitutive modelling; AA7150-T7751 stress relaxation aging behavior; pre-strain; initial stress levels; temperature; constitutive modelling; AA7150-T7751

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MDPI and ACS Style

Cai, Y.; Zhan, L.; Xu, Y.; Liu, C.; Wang, J.; Zhao, X.; Xu, L.; Tong, C.; Jin, G.; Wang, Q.; et al. Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains. Metals 2019, 9, 1215. https://doi.org/10.3390/met9111215

AMA Style

Cai Y, Zhan L, Xu Y, Liu C, Wang J, Zhao X, Xu L, Tong C, Jin G, Wang Q, et al. Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains. Metals. 2019; 9(11):1215. https://doi.org/10.3390/met9111215

Chicago/Turabian Style

Cai, Yixian, Lihua Zhan, Yongqian Xu, Chunhui Liu, Jianguang Wang, Xing Zhao, Lingzhi Xu, Canyu Tong, Gengquan Jin, Qing Wang, and et al. 2019. "Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains" Metals 9, no. 11: 1215. https://doi.org/10.3390/met9111215

APA Style

Cai, Y., Zhan, L., Xu, Y., Liu, C., Wang, J., Zhao, X., Xu, L., Tong, C., Jin, G., Wang, Q., Hu, L., & Huang, M. (2019). Stress Relaxation Aging Behavior and Constitutive Modelling of AA7150-T7751 under Different Temperatures, Initial Stress Levels and Pre-Strains. Metals, 9(11), 1215. https://doi.org/10.3390/met9111215

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