Microstructural and Texture Investigation on Shock Wave Assisted Deformation of Magnesium

Shock induced deformation of pure polycrystalline Magnesium along perpendicular to basal plane resulted in grain refinement (from 80 µm to 40 µm) mediated through formation of deformation twins (ET). There is a significant weakening of bulk texture has been observed because of grain fragmentation which produces many new orientations and leads to grain refinement. Extension twinning (ET) of the {10 \(\overline{1 }\) 2} type at 86o misorientation angle and <11 \(\overline{2 }\) 0> misorientation axis are dominant deformation mechanism in shocked magnesium, also play key role in texture weakening. Mainly, basal (0001) texture weakening was seen, and no other components were observed. Strain gradient within the grain having higher value at the grain boundary whereas peak shift in the kernel average misorientation (KAM) distribution plot by 0.5° (10%) towards higher strain in post deformed sample. Microhardness was found to be highest (50 Hv) at the mid-point deflection region and it decreases systematically towards the periphery.