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Effects of stress state on the deformation and damage mechanisms of Mg alloys

Babak Kondori (Texas A&M University), A. Amine Benzerga (Texas A&M University)

Materials for Extreme Environments: Multiscale Experiments and Simulations

Mon 2:40 - 4:00

Salomon 203

Much is known about the uniaxial response of Mg alloys under both tension and compression. Yield and plastic flow anisotropy are often invoked to rationalize their low formability with the propensity for twinning playing a potentially important role in damage accumulation to failure. However, little is known about the behavior of Mg alloys under multi-axial stress and deformation states. Here we investigate such states under initially axisymmetric stressing with different amounts of hydrostatic pressure superimposed onto some uniaxial loading. To achieve this, round notched bars with varying notch radii are used. Compression cylindrical pins are also used to characterize the yield and plastic flow anisotropy along all principal directions of a plate, as well as in three off-axes orientations. The effects of stress state triaxiality on the anisotropy of deformation and on the fracture behavior are investigated in both AZ31B and WE43 alloys.