Deformation and Failure Mechanisms in a Magnesium Alloy Under Uniaxial Compressive Loading
Tóm tắt
We have investigated the deformation and failure mechanisms of a rolled AZ31B magnesium alloy under both quasi-static (
$$10^{-3}\,{\text {to}}\,10^{-2}\,{\text{s}}^{-1}$$
) and dynamic (
$$10^{3}\,{\text{s}}^{-1}$$
) compressive loading. The observed anisotropy in the plastic response originates from the different in-plane and out-of-plane deformation mechanisms activated when the loading orientation changes. For plasticity driven by extension twins, extension twin–twin boundaries were found to dominate in the late stage of deformation. Severe localization was observed after deformation mediated by pyramidal slip and contraction twinning compared to the deformation mainly caused by extension twinning. The fracture process was established as a function of both loading rate and loading orientation. Moreover, the intermetallic inclusions in the material, which appeared to be hard and brittle, might lead to macroscopic fracture under compressive loading.
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