Study on Influence of Torsion Turns on Microstructure Evolution and Mechanical Properties in an AZ80 Magnesium Alloy Processed by High-Pressure Torsion

The AZ80 magnesium alloy was prepared through a series of process including melting, forging, and high-pressure torsion (HPT). The results indicate that the high-pressure torsion process effectively refines the grain size and enhances the mechanical properties of the alloy, particularly at the 1/2 radius of the samples. Furthermore, the dislocation density in the HPT-ed samples is higher than that in the initial sample and decreases with an increasing number of torsion turns. Aging treatment results show that both the degree of recrystallization and the variation in Vickers hardness exhibit stable trends in samples subjected to high torsion turns, especially in the 10-turn sample. This study provides a foundation for controlling the microstructure and mechanical properties of AZ80 magnesium alloy.