1Key Laboratory of New Processing Technology for Nonferrous Metal & Materials (Ministry of Education), Guilin University of Technology, Guilin 541004 2State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004 3Guangxi Key Laboratory of Universities for Clean Metallurgy and Comprehensive Utilization of Nonferrous Metal Resources, Guilin 541004
Abstract：The static and dynamic precipitation behavior of solution-treated binary Al–20 wt.% Zn alloy is investigated via artificial aging, cold rolling and artificial aging combined with cold rolling. The solution-treated Al–Zn alloy exhibits high thermal stability during aging, and low densities of nano-sized Zn particles are precipitated along with Al grain boundaries after aging at 200$^{\circ}\!$C for 13 h. Compared with static precipitation, dynamic precipitation occurs more easily in the Al–Zn alloy. Zn clusters are obtained after cold rolling at an equivalent plastic strain of 0.6, and the size of the Zn phase reaches hundreds of nanometers when the strain is increased to 12.1. The results show that the speed of static precipitation can be significantly enhanced after the application of 2.9 rolling strain. Grain refinement and defects induced by cold rolling are considered to promote Zn precipitation. The hardness of Al–Zn alloy is also affected by static and dynamic precipitations.
2016, Vol. 33 
