Transactions of Materials and Heat Treatment

Title：Optimization on isothermal open-die forging temperature for aluminum alloy 7075

Authors： Gao Shengxiang Deng Lixia Zhang Wenxiang

Unit： Zhejiang Industry Polytechnic College Hefei University of Technology

KeyWords： Hefei University of Technology

ClassificationCode：TG146.4

year,vol(issue):pagenumber：2018,43(8):8-12

Abstract：

In order to optimize the performance of aluminum alloy 7075, the isothermal open-die forging test of aluminum alloy 7075 was implemented under different forging temperatures, and the influences of forging temperature on tensile property, impact property and wear resistance were analyzed. The experimental results show that when the forging temperature is too low, the dynamic recrystallization hardly occurs inside aluminum alloy 7075, and the existed uneven microstructure with large grain size is not conducive to the improvement of tensile property and impact property as well as wear resistance. However, with the increase of forging temperature, the dynamic recrystallization inside aluminum alloy 7075 is improved, the grain size is smaller and refined to realize uniform distribution, and the tensile property and impact property as well as wear resistance are improved. When the forging temperature reaches 420 ℃, the dynamic recrystallization is up to the strongest, the alloy grains are almost completely refined with uniform distribution, the microstructure is improved to the maximum extent, and the tensile property and impact property as well as wear resistance are improved greatly. Furthermore, when the temperature exceeds 420 ℃, the dynamic recrystallization of aluminum alloy 7075 no longer occurs, the grain is no longer refined and becomes coarse, and the microstructure becomes uneven and no compact, which leads to the decrease trend of tensile property, impact property and wear resistance. So, the optimized forging temperature of aluminum alloy 7075 is 420 ℃.

Funds：

2016 年浙江省教育厅科研项目（Y201636055）

高生祥（1978-），男，硕士，副教授 E-mail：307437234@qq.com

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