Strain Localization During Compressive Deformation of Mg-Gd Alloy

Strain localization occurring at advanced deformation under compression of Mg-0.28 at. pctGd alloy has been studied. The strain localization develops in previously twinned microstructure in the form of shear bands (SBs) represented by narrow, heterogeneous zones of localized deformation. The onset of shear banding appears when the work hardening capacity of the material is exhausted. SBs are promoted by activation of high-stress contraction and double twins and are 18 pct harder than the surrounding parent material. It is shown that the development of strain localization delays the failure, which is attributed to the strengthening effect of SBs.