Influence of Sc on Microstructure and Mechanical Properties of High Zn-Containing Mg Alloy

الملخص EN

Microstructures and mechanical properties of Mg-11Zn and Mg-11Zn-1Sc (wt%) alloys were investigated.

The main secondary phase of Mg-11Zn and Mg-11Zn-1Sc alloys is MgZn2 phase.

Rare earth Sc element is an effective grain refiner and the grain size of Mg-11Zn-1Sc alloy is greatly refined.

The mechanical properties of the Mg-11Zn alloy were greatly improved with incorporation of 1 wt% Sc, especially for the elevated temperature strength.

Such mechanical property enhancement is ascribed to the refinement and pinning mechanism of high heat-resistant Sc and Sc-containing intermetallic particles in Mg alloy.