Effects of Y and Ce addition on microstructure and mechanical properties of squeezing casting Mg-6Al alloy were investigated by OM（optical microscope） and SEM（scanning electron microscope）

universal tensile tester.The results indicate that microstructure of squeezing casting Mg-6Al alloy is transformed from net-like structure into discontinuous net-like structure

in which the grain size is greatly refined

and mechanical properties of the alloy at room temperature can be significantly raised with Y and Ce mixed addition.Tensile strength and elongation of the squeezing casting Mg-6Al alloy with 0.5% Ce and 0.5% Y addition are increased from 126 MPa to 200 MPa and from 1% to 8.5%

respectively.