THERMAL-DEFORMATION MODEL OF A Sr-MODIFIED A356 ALUMINUM ALLOY

  • Yongyue Liu School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 China
  • Xianglai Xu School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 China
  • Jiangxiong Cheng School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 China
  • Hongwei Sun School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 China
  • Xueping Ren School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083
  • Peng Jiang School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 China
Keywords: A356 aluminum alloy, Sr modification, microstructure, thermal-deformation model

Abstract

The hot-deformation behavior of A356 aluminum alloy with a Sr modification was investigated using a Gleeble 1500 thermal simulator. The true stress-strain curves with a deformation temperature of 300–500 °C and a strain rate of 0.01–5 s–1 were clarified. The activation energy of the A356 aluminum alloy with Sr modification was 221.474 kJ/mol. The influences of friction and temperature on the curves were investigated, and then the constitutive equation was established. The results show that the flow stress is obviously affected by temperature and strain rate. The experimental stress is lower than the theoretical stress, and the stress difference between the experimental and theoretical stress increases with the increasing strain. The maximum stress difference reaches 17.8 MPa when the sample deformed at 300 °C/5 s–1 with a reduction of 16 %. For all the deformation conditions the correlation coefficient is 0.99 and the average relative error is 4.8 %, which shows the good predictability of the current model. The developed constitutive equation can provide guidance for the study of the hot-deformation behavior of similar aluminum alloys.

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Published
2022-04-06
How to Cite
1.
Liu Y, Xu X, Cheng J, Sun H, Ren X, Jiang P. THERMAL-DEFORMATION MODEL OF A Sr-MODIFIED A356 ALUMINUM ALLOY. MatTech [Internet]. 2022Apr.6 [cited 2022Jun.27];56(2):225–232. Available from: https://mater-tehnol.si/index.php/MatTech/article/view/355