Abstract
The grain refinement mechanism and resulting grain-refinement strengthening effect of rare earth elements Y and Sm on magnesium alloy AZ81 have been investigated by means of microstructure analysis, tensile tests and theoretic calculation. The results show that the formation of high melting-point Al2Y and Al2Sm phases is observed in magnesium alloy AZ81 after 1.8 wt% Y and Sm addition. The phases act as the heterogeneous nucleation cores of α-Mg matrix, and refine the grain size. It leads to the effective grain-refinement strengthening and enhance the strength of the alloy.
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