Influences of solution treatment on microstructure and mechanical properties of AZ31 magnesium alloy were investigated by Zeiss microscope and X-ray diffraction.The results show that the tensile strength of AZ31 magnesium alloy is increased from 69.7 MPa to 86.6 MPa with solid solution treatment at 688K from 6 h to 12 h.The β-Mg17Al12 phase in the microstructure of the AZ31 magnesium is gradually dissolved into the matrix phase after solid solution at 688 K for 12 h.With increasing in the solution time

the static recrystallization in the magnesium alloy can be fully undergone

and a large amount of fine recrystallization grains with the average size of 10 μm are generated at the boundary of the AZ31 magnesium alloy after the solid solution at 688 K for 12 h.