Enhancing Fracture Toughness of Magnesium Alloy by Formation of Low-Angle Grain Boundary Structure

The effect of the low angle grain boundary structure on the mechanical properties and deformation behavior was investigated using Mg-Al-Zn alloys, which were produced by caliber rolling. The {10-12} deformation twins were formed at the head of the crack-tip during fracture toughness even in the fine-grained structures; however, the present caliber rolled alloys showed high strength and fracture toughness balance that resulted from the high fraction of low-angle grain boundaries, which did not become the origin of the micro-void formation.