The production of thin-walled complex WE54 magnesium alloy parts was carried out with ceramic mold shell by different casting methods.The results show that there exists cold shut

flow line

shrinkage porosity（hole）in the gravity casting thin-walled complex magnesium components due to its low filling ability

while the components with smooth surface and distinct profile as well as high dimensional precision and defect-free can be produced by low pressure casting.The mechanical properties of the low pressure casting magnesium alloy components treated by solid solution are significantly improved

in which the tensile strength and yield strength as well as elongation of the heat treated components are 272.6 MPa

205.29 MPa and 0.99%

respectively

which is attributed to the precipitation of dispersive fine MgY phase from the supersaturated solution phase.