Transactions of Materials and Heat Treatment

Title：Study on high-temperature rheological behavior and constitutive model for A356 aluminum alloy

Authors：

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ClassificationCode：TG146.2

year,vol(issue):pagenumber：2022,47(4):242-248

Abstract：

The high-temperature rheological behaviour and the constitutive model of A356 aluminum alloy play an important role on its stress state, which lays a significant foundation for the finite element simulation of aluminum alloy during the rheological forming process. Therefore, the tensile specimens were prepared from A356 aluminum alloy wheel hub casting billet, the isothermal tensile experiments were conducted by test machine Instron 3369 at the experimental temperature of 300-375 ℃ and the strain rate of 0.001-0.1 s-1. The obtained true stress-true strain curves show that the rheological stress of material is significantly affected by thermodynamic conditions such as temperature and strain rate. Based on the true stress-true strain curve, a physical model based on dislocation density theory was established to characterize the rheological stress under different thermodynamic conditions. The predicted value of the model was compared with the experimental data, and the error analysis was carried out. The results show that the established physical model can accurately predict the high-temperature tensile rheological behaviour of A356 aluminum alloy.

Funds：

国家自然科学基金资助项目（51275533）；河北省院士工作站建设专项（179A76193H）

作者简介：曾胜（1995-），男，硕士研究生 E-mail：zengsheng95@csu.edu.cn 通信作者：常海平（1978-），男，硕士，高级工程师 E-mail：changhaiping@dicastal.com

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