Transactions of Materials and Heat Treatment

Title：Thermal deformation behavior of homogeneous 7475 aluminum alloy

Authors： Wang Yonghong1 2 Wang Jingtao1 2 Huang Tongjian1 Yang Hang1 Guo Fengjia1 2 3 Zheng Cheng1 2

Unit： 1. National Engineering Research Center for Plastic Working of Aluminium Alloys Shandong Nanshan Aluminium Co. Ltd. 2. Nonferrous Metal Industry Research Institute Shandong Nanshan Aluminum Co. Ltd. 3. College of Materials Science and Engineering Yantai Nanshan University

KeyWords： homogeneous 7475 aluminum alloy thermal deformation rheological stress constitutive equation thermal processing map

ClassificationCode：TG146.2+1

year,vol(issue):pagenumber：2024,49(10):248-255

Abstract：

The high-temperature thermal deformation behavior of homogeneous 7475 aluminum alloy was studied by using thermal simulation testing machine Gleeble-3500 at the deformation temperature of 300-450 ℃ and the strain rate of 0.01-1 s-1. The results show that with the increasing of strain rate and the decreasing of deformation temperature, the rheological stress shows an increasing trend, and the true stress-true strain curve exhibits obvious work hardening and dynamic softening phenomena. Based on this, a constitutive model based on hyperbolic sine equation is established to describe the thermal deformation behavior of alloy at high temperature. In addition, based on the experimental data and the dynamic material model, the thermal processing maps under different strains are established to reveal the influences of strain, deformation temperature and strain rate on the power dissipation rate η and rheological instability ξ. According to the trend of power dissipation rate during the entire thermal deformation process, it is concluded that the homogeneous 7475 aluminum alloy mainly undergoes dynamic recovery and dynamic recrystallization, without superplasticity. The rheological instability zone and safe processing zone are further analyzed, and the optimal thermal processing zone of homogeneous 7475 aluminum alloy is determined to be the deformation temperature of 420-450 ℃ and the strain rate of 0.026-0.185 s-1.

Funds：

作者简介：王永红（1986-），女，硕士，工程师,E-mail：2645138291@qq.com

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