Mechanical behavior and deformation mechanisms of AZ31 Mg alloy at liquid nitrogen temperature

Abstract

The mechanical behavior and deformation mechanisms of AZ31 magnesium alloy at liquid nitrogen temperature were investigated by compressing samples with different original textures to fracture at liquid nitrogen and ambient temperatures with different constant true strain rates. The results showed that the samples compressed at liquid nitrogen temperature exhibit higher strength especially when compression axis parallel to extrusion direction. Mechanical anisotropy is more remarkable during compressing at liquid nitrogen temperature. Twinning tends to be inhibited at liquid nitrogen temperature, regardless of original orientation and strain rate. The two main deformation mechanisms at liquid nitrogen temperature are twinning in several certain grains and grain rotation.