Dynamic mechanical behavior and microstructure evolution of 7A52-T6 alloy at elevated temperatures

Abstract

Dynamic mechanical behavior and microstructural evolution of 7A52-T6 aluminum alloy were investigated at elevated temperatures ranging from 150 to 350°C and strain rates ranging from 2000s−1 to 5000s−1 using a compressive hospitalization pressure bar (SHPB) system. The results show that 7A52 aluminum alloy has obvious temperature sensitivity, but the sensitivity to strain rate is weak. The effects of temperature on the microstructure of 7A52 aluminum alloy are significant, and the dislocation density decreases with the increase of temperature. With the increase of impact temperature, some of the η’ phases are dissolved, and some of them are transformed into η phases. This study in general provides a significant understanding on the relationship between microstructure evolution and mechanical behavior of 7A52-T6 aluminum alloy under dynamic loading and at elevated temperature.