There is considerable research on magnesium and its alloys for on-board hydrogen storage due to their high hydrogenstorage capacity by weight and low cost [15]. Besides, the Mgbased hydrides possess good-quality functional properties, such as heat-resistance, vibration absorbing, reversibility and recyclability.In recent years, therefore, much attention has been paid to investigations on specific material properties of Mg alloys for the development of new functional materials.