|About this Abstract
||2021 TMS Annual Meeting & Exhibition
||Magnesium Technology 2021
||Role of microstructural heterogeneities in damage formation and fracture of coarse-grained Mg during tensile loading
||Evgenii Vasilev, Marko Knezevic
|On-Site Speaker (Planned)
In-situ and ex-situ tension tests are carried out in conjunction with electron backscatter diffraction and micro X-ray computed tomography on coarse-grained samples of pure magnesium to study the development of structural heterogeneities and voids induced by plastic deformation. Heterogeneities initiate in grains favorably oriented for basal slip and twins as these reorient grains from harder to softer orientations for basal slip. In particular, nucleation of voids is observed at the interface between soft twinned domains and hard parent grains. Additionally, large twins accommodate significant shear strain form surface ridges. Such heterogeneities also result in voids nucleation from the surface. In addition to twinning induced voids, damage accumulates and voids form and propagate along high-angle grain boundaries between grains with low Schmid factor for basal slip. Such observations are rationalized with the activity on non-coplanar slip systems on each side of the grain boundary inducing strong pile barrier effects triggering voids.