Improved Zr Grain Refining Efficiency For Commercial Purity Mg Via Intensive Melt Shearing

The low concentration Zr and intensive melt shearing effects on grain refinement of commercial purity Mg has been studied. It was found that the low concentration Zr addition, combined with intensive melt shearing, resulted in a significantly grain refinement. The mechanism of grain refinement on the intensive melt shearing dispersing MgO film into individual MgO particle and enhancing the adsorption of low concentration Zr on the surface of MgO particle was proposed.