Effects of mechanical vibration on microstructure and mechanical properties of AZ91D magnesium alloy in lost foam casting have been investigated

and its vibration refinement mechanism is understood. The results show that mechanical vibration can significantly refine the as-cast microstructure of the AZ91D magnesium alloy to improve the mechanical properties. The maximum tensile strength can be obtained with the vibrated force of 1.5 kN. With the further increase of the vibrated force

the tensile strength of the Mg alloy can be somewhat decreased arising from the formation of micro-porosity in the microstructure.