Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

doi:10.1007/s40436-018-0243-8

Advances in Manufacturing ›› 2019, Vol. 7 ›› Issue (1): 30-41.doi: 10.1007/s40436-018-0243-8

Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

Ze-Xing Su^1,2, Chao-Yang Sun^1,2, Ming-Wang Fu³, Ling-Yun Qian^1,2

1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China;
2 Beijing Key Laboratory of Lightweight Metal Forming, Beijing 100083, People's Republic of China;
3 Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, People's Republic of China

收稿日期:2018-05-23 出版日期:2019-03-25 发布日期:2019-03-22
通讯作者: Chao-Yang Sun E-mail:suncy@ustb.edu.cn
基金资助:
The work is financially supported by the Natural Science Foundation of Beijing Municipality (Grant No. 3182025), the National Natural Science Foundation of China (Grant No. U1730121), the Joint Foundation (general) Project of the Equipment Pre-research of the Ministry of Education (Grant No. 6141A020221) and the Postdoctoral Science Foundation of China (Grant No. 2017M620609).

Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

Ze-Xing Su^1,2, Chao-Yang Sun^1,2, Ming-Wang Fu³, Ling-Yun Qian^1,2

1 School of Mechanical Engineering, University of Science and Technology Beijing, Beijing 100083, People's Republic of China;
2 Beijing Key Laboratory of Lightweight Metal Forming, Beijing 100083, People's Republic of China;
3 Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hung Hom, Hong Kong, People's Republic of China

Received:2018-05-23 Online:2019-03-25 Published:2019-03-22
Contact: Chao-Yang Sun E-mail:suncy@ustb.edu.cn
Supported by:
The work is financially supported by the Natural Science Foundation of Beijing Municipality (Grant No. 3182025), the National Natural Science Foundation of China (Grant No. U1730121), the Joint Foundation (general) Project of the Equipment Pre-research of the Ministry of Education (Grant No. 6141A020221) and the Postdoctoral Science Foundation of China (Grant No. 2017M620609).

摘要/Abstract

摘要： A physical-based constitutive model was developed to model the viscoplastic flow behavior and microstructure evolution of AZ80 magnesium alloy during the hot working process. The competing deformation mechanisms, including work hardening, dynamic recovery, and dynamic recrystallization, in an isothermal compression environment were considered in the model. The internal state variables, including the normalized dislocation density and recrystallized volume fraction, were incorporated into the model to articulate the microstructure evolution during hot deformation. The kinetic condition critical for dynamic recrystallization, considering the effects of the deformation temperature and strain rate, was obtained by employing both the Poliak-Jonas criterion and Zener-Hollomon parameter. Microstructure observations indicate that the recrystallized volume fraction increases with decreasing Z parameter at constant strain, which is consistent with the predicted kinetics model. Based on the developed model, a good correlation was also obtained between the predicted and experimental flow stress. The results indicate a good predictability of the model in describing the hot deformation behavior and microstructure evolution of AZ80 magnesium alloy.

The full text can be downloaded at https://link.springer.com/content/pdf/10.1007%2Fs40436-018-0243-8.pdf

关键词: AZ80 magnesium alloy, Hot deformation, Constitutive model, Microstructure evolution, Dynamic recrystallization (DRX)

Abstract: A physical-based constitutive model was developed to model the viscoplastic flow behavior and microstructure evolution of AZ80 magnesium alloy during the hot working process. The competing deformation mechanisms, including work hardening, dynamic recovery, and dynamic recrystallization, in an isothermal compression environment were considered in the model. The internal state variables, including the normalized dislocation density and recrystallized volume fraction, were incorporated into the model to articulate the microstructure evolution during hot deformation. The kinetic condition critical for dynamic recrystallization, considering the effects of the deformation temperature and strain rate, was obtained by employing both the Poliak-Jonas criterion and Zener-Hollomon parameter. Microstructure observations indicate that the recrystallized volume fraction increases with decreasing Z parameter at constant strain, which is consistent with the predicted kinetics model. Based on the developed model, a good correlation was also obtained between the predicted and experimental flow stress. The results indicate a good predictability of the model in describing the hot deformation behavior and microstructure evolution of AZ80 magnesium alloy.

The full text can be downloaded at https://link.springer.com/content/pdf/10.1007%2Fs40436-018-0243-8.pdf

Key words: AZ80 magnesium alloy, Hot deformation, Constitutive model, Microstructure evolution, Dynamic recrystallization (DRX)

Ze-Xing Su, Chao-Yang Sun, Ming-Wang Fu, Ling-Yun Qian. Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy[J]. Advances in Manufacturing, 2019, 7(1): 30-41.

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Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

Physical-based constitutive model considering the microstructure evolution during hot working of AZ80 magnesium alloy

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