The microstructure of semi-solid Mg-10Al-4Zn alloy was observed by OM（optical microscope）

SEM（scanning electron microscope）

EDS（energy dispersive spectrometer） and LEXT.OM observation reveals that there exists the fine and round semi-solid microstructure with uniform distribution and higher solid fraction.The finer structure can be observed by SEM

and the melting firstly occurred in the boundary with higher solute concentration by combining with EDS analysis.LEXT observation indicates that the solid phase particle is spheroid in three-dimensional structure

which is composed of eutectic phase and remelting α-Mg phase by two-dimensional planar height diagram verification.