Ex-situ EBSD analysis of hot deformation behavior and microstructural evolution of Mg-1Al-6Y alloy via uniaxial compression

摘要

The microstructure and texture evolution of as-extruded Mg-0.96 wt%Al-5.82 wt%Y (denoted as Mg-1Al-6Y) alloy with strain at a temperature of 350 ℃ and a strain rate of 0.1 s~(-1) were studied using ex-situ electron backscatter diffraction (EBSD). Moreover, the deformation mechanism was systematically analyzed. The results shown that weak <2-1-11> rare-earth texture and no twinning were observed in the as-extruded Mg-1Al-6Y alloy. The hot compression curve exhibited obvious work-hardening characteristics with a yield strength of 98 MPa. In the initial stage of deformation, {10-12} extension twinning was formed in some grains. As the strain increased, the number of {10-12} extension twinning and texture intensity gradually decreased, whereas the amount of low-angle grain boundaries increased. The Schmid factor (SF) of pyramidal slip remained at ~0.4. In addition, the TEM characterization revealed that as the strain increased, dislocations multiplied, and the pyramidal