Effect of silicon on damping capacities of pure magnesium and magnesium alloys

A new idea of using a stiffer metallic compound Mg2Si to enhance the damping capacities of pure magnesium and its alloys is successfully attempted. The present paper focuses on the relation between damping capacities and the addition amount of Si. The results show that damping capacities increase with increasing amount of Si. Particular emphasis is placed on the increasing dislocation density around matrix–particulate interface and the refinement of grain size promoted by big growth restriction factor of Si.