Fabrication of High-Strength Mg(AZ91D)/NiTi Composites by Infiltration and Their Compressive and Damping Properties

In order to improve the mechanical properties and damping capacity of porous NiTi alloy, an method for fabricating the novel Mg(AZ91D)/NiTi composites with optimized damping capacity and mechanical properties by infiltration of Mg (AZ91D magnesium alloy) into porous NiTi alloys had developed, and the compressive and damping properties of the composite were studied. The results show that the composites still possessed the martensitic transformation features, and showed excellent cycling compressive properties including excellent linear superelasticity up to 2.3%. The compressive strength of the composites could reach to 530 MPa, higher than that of porous NiTi alloys (200-300 MPa) obviously. The several damping mechanisms benefiting from the introduction of infiltrated phases made Mg(AZ91D)/NiTi composites had better general combination of strength and damping capacity.