Study on the reversion aging process of 7075 T4 aluminum alloy
7075 aluminum alloy has low density,high specific strength and good aging hardening behavior.It is widely used in aerospace and military at present and will play an important role on automotive lightweighting in the future.It is,however,prone to cracking and springback during cold forming,and the traditional hot forming equipment costs much.Therefore,Integrated Reversion Aging and Forming(IRAF)has been investigated in order to achieve a cost-efficient and productive process on forming high-performance 7075T4 alu-minum alloy.The reversion aging characteristics of high-strength 7075T4 aluminum alloy has been studied at 120 ℃-240 ℃ with hardness test,tensile test and SEM/TEM.The results show that IRAF effectively improves formability of 7075T4 aluminum alloy and leads to good paintbake response(pbr).
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