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Ex-situ EBSD analysis of hot deformation behavior and microstructural evolution of Mg–1Al–6Y alloy via uniaxial compression
Materials Science and Engineering: A ( IF 4.081 ) Pub Date : 2020-01-20 , DOI: 10.1016/j.msea.2020.138978
Mengna Zhang; Jinhui Wang; Yunpeng Zhu; Lei Zhang; Peipeng Jin

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 °C 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 dislocation was always observed. Therefore, the reduction of twinning and activation of pyramidal slip lead to the dominance of slip during the deformation. Hence, work hardening appeared in the compression curve of Mg–1Al–6Y alloy.
更新日期:2020-01-21

 

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