Aluminum alloy materials without special treatment belong to low-plasticity and difficult-to-deform materials under normal temperature conditions, which restricts its application in industry. Therefore, taking 6061-T6 aluminum alloy sheet as the research object, the effects of diffe-rent heat treatment process parameters such as heating temperature, holding time and cooling mode on the plasticity and hardness of 6061 aluminum alloy were studied by means of uniaxial tensile test, Vickers hardness test and metallographic tests. The results show that the degree of recrystallization is the main factors affecting the plastic properties of 6061 aluminum alloy. When the heat treatment heating temperature is range from 410℃ to 590℃, and the holding time is 2 h, and under air cooling (AC) conditions, the plastic properties of 6061 aluminum alloy had fluctuating increase trend with the rise of heating temperatures, reaching maximum value of 22.92% at 560℃. While the hardness of the aluminum alloy showed a trend of decreased first and then increased. Under the same heat treatment temperature and cooling conditions, extending the hol-ding time, the plasticity of the 6061 aluminum alloy first increased and then decreased, and the overall trend was upward, while change tendency of hardness shows it down first and then up. Under the same heat treatment temperature and holding time, different cooling methods, such as air cooling(AC), furnace cooling(FC) and water quenching(WQ), have little effect on the plastic properties of 6061 aluminum alloy, but it have a greater impact on the hardness. Under the selected test conditions, considering the mechanical properties of 6061 aluminum alloy comprehensively, the heat treatment temperature is 560℃, holding time is 4 h, and the ideal strength, hardness and plasticity can be obtained under water quenching. © 2021, Materials Review Magazine. All right reserved.
