Effect of hot deformation on the microstructure of spray-formed 7055 aluminum alloy extruded plate
蔺晓敏 1吴晓东 1曹玲飞 2唐松柏 1白敏1
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作者信息
1. International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China
2. International Joint Laboratory for Light Alloys(Ministry of Education),College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China;Shenyang National Laboratory for Materials Science,Chongqing University,Chongqing 400044,China
The hot deformation behavior of spray-formed 7055 aluminum alloy extruded plate was studied under conditions of 300-450℃and 0.01-25 s-1 through a combination of Gleeble hot compression experiments and Deform-3D software simulations.The processing maps,simulation results,and calculation of residual dislocation density and stored energy were used to understand the microstructure evolution of the alloy.The results show that the optimum hot working conditions for the alloy lies within the high-temperature and low-strain rate region(400-450℃,0.01-1.0 s-1),where the power dissipation coefficient η is the highest and the damage is the lowest.The unstable domain is concentrated in the high strain rate region(1.0-25 s-1),which has the highest damage and is prone to cracking.Moreover,a slow heating and long duration heat-treatment prior to hot deformation was designed to solve the problem of formation of coarse grains and abnormal grain growth after solution treatment.This heat treatment can effectively reduce the residual dislocation density and stored energy,and promote the precipitation of Al3Zr particles to hinder dislocation movement and pin grain boundaries,thereby inhibiting the static recrystallization during solution treatments.
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