Effects of Three-Step Aging on Microstructure and Stress Corrosion Cracking of 7N01 Aluminum Alloys

Shuai Wang, Binghui Luo, Yaya Zheng, Sizhi Tan, Gen Jiang, Guochao Cai
2019 IOP Conference Series: Materials Science and Engineering  
The precipitation of 7N01 alloy after three-step ageing treatment at 65°C, 100°C and 150°C has been investigated. The SAED results show that at 65°Cpre-aging the GPI zones were precipitated from the quenched solid solution and aging at 150°C results in evolution of the GPI zones formed during under ageing into the η' phase. It was found that compared with the two-stage aging(T74) and T6 aging, pre-aging at 65°C significantly increased number density of η' phase. The modified microstructure
more » ... ts in tensile properties comparable to that of the T6 temper, but with significantly improved the resistance of stress corrosion cracking performance.
doi:10.1088/1757-899x/562/1/012063 fatcat:r6g5wffekvds5hye74ptmqjvii