Analysis of Tensile Deformation Behavior of Rolled AZ31 Mg Alloy Subjected to Precompression and Subsequent Annealing Using DIC

This study investigates the effects of precompression and subsequent annealing on tensile deformation behavior a rolled AZ31 Mg alloy at room temperature using digital image correlation (DIC). When as-rolled sample (AR sample) is subjected to precompresssion along rolling direction (RD) transverse (TD), sample’s texture changes from typical normal (ND)-oriented basal RD- TD-oriented textures, respectively, because lattice reorientation by {10– 12} twinning. During tension RD, AR precompressed TD subsequently annealed 250 o C (TDCA accomodate strain via dislocation slip, resulting in high yield strengths slip-dominant strain-hardening behaviors. In contrast, RD (RDCA exhibits low strength twinningdominant behavior, owing vigorous activation {10–12} twinning during tension. DIC results reveal that sample, noticeable localization occurs an early stage due difficulty accommodating thickness direction. RDCA distribution relatively homogeneous twinning, but rapid hardening caused abundant twins causes premature crack initiation. Because planes most grains TDCA are aligned parallel direction, effectively accommodated prismatic highest elongation among three samples.