Dynamic recrystallization of AZ91 magnesium alloy during compression deformation at elevated temperature

High temperature compressive tests of AZ91 Mg alloy were carried out at 573 - 723 K and strain rates of 0. 001 - 1 s^-1 . The microstructures of as-compressed samples were observed by optical microscopy and transmission electron microscopy (TEM), and the microhardness was also tested. It is shown that with the increase of temperature or the decrease of strain rate, the flow stress decreases, at the same time the dynamic recrystallization (DRX) of the alloy is more noticeable. The microstructures reveal that continuous dynamic recrystallization, which develops through conversion of low-angle grain boundaries into high-angle boundaries, occurs preferentially at the grain boundary.

Dynamic recrystallization of AZ91 magnesium alloy during compression deformation at elevated temperature

High temperature compressive tests of AZ91 Mg alloy were carried out at 573 -723 K and strain rates of 0. 001 - 1s -1. The microstructures of as-compressed samples were observed by optical microscopy and transmission electron microscopy (TEM), and the microhardness was also tested. It is shown that with the increase of temperature or the decrease of strain rate, the flow stress decreases, at the same time the dynamic recrystallization (DRX)of the alloy is more noticeable. The microstructures reveal that continuous dynamic recrystallization, which develops through conversion of low-angle grain boundaries into high-angle boundaries, occurs preferentially at the grain boundary.