Effect of Cu Content on Precipitation Behavior of Al-Zn-Mg-Cu Aluminum Alloy
CHAO Daiyi1, SUN Youzheng1, LIU Xiaoteng1, LI Xingdong1, LI Weijian2, LYU Zhengfeng1, CHENG Rence1
1 National Engineering Research center for Plastic Working of Aluminium Alloys, Shandong Nanshan Aluminum Co., Ltd., Longkou 265713; 2 College of Nuclear Equipment and Nuclear Engineering, Yantai University, Yantai 264005
Abstract: The effects of Cu content on precipitation behavior of GP area and η′ phase of Al-Zn-Mg-Cu aluminum alloy was investigated by using the aluminum alloy module in thermodynamic simulation software in detail. The results show that the content of some Cu element was in GP area and η′ phase. Under aging temperature of 120 ℃ and 160 ℃, with the increase of Cu content from 1.9% to 2.5%, the content of GP area decreased from 2.65% and 1.11% to 2.60% and 1.02% respectively. While the content of η′ phase decreased from 6.71% and 6.52% to 7.25% and 7.07% respectively. The used time of η′ phase content reaching 6.5wt% decreased with the increase of Cu content. The time from 23 h and 5 h droped down to 16 h and 2.8 h with the increase of Cu content at the aging temperature 120 ℃ and 160 ℃, respectively. The nose temperature kept at 150 ℃ of GP area and 330 ℃ of η′ phase with the increasing of Cu content, as well as the critical cooling ratio kept at 16 ℃/s. In other words, the content of Cu have a little effect on quenching sensitivity.
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2019, Vol. 33 
