Effect of temperature on microstructure and texture evolution of Mg-Zn-Er alloy during hot compression

The microstructure and texture evolutions in Mg-Zn-Er alloy during hot compression were investigated by using optical microscope (OM), field emission scanning electron microscope (EBSD) and transmission electron microscope (TEM). The results indicate that the temperature plays an important role in dynamic recrystallization (DRX) mechanism. The twin dynamic recrystallization (TDRX) is induced at a strain of 0.6 because of the activation of non-basal slip «a+c» dislocations at 200 °C. Meanwhile, the continuous DRX (CDRX) occurs at 350 °C, which is identified by the typical necklace-like structure around the residual initial grains. The DRX contributes to the modification of texture significantly. The tension twins are responsible for the weak texture at 200 °C. Meanwhile, the decrease in the basal texture is ascribed to the DRX sites which transfer from twin boundaries to initial grain boundaries as the temperature is increased from 200 to 350 °C.

Duke Scholars

Author Zhaohui Wang Pathology