Quenching and ageing behaviors of Mg-Li-Zn alloy

The effects of the condition of solid solution treatment and the kind of quenching medium on the ageing behaviors of the Mg-7Li-14Zn(%) alloys were studied. The optimum conditions of solid solution treatment were certained as solid solution at 370 degrees C for 1 h, and water quenching. The experiments indicates that the mechanical properties of the ternary alloy are sigma(b) = 305. 1 MPa, sigma(0.2) = 191.8 MPa, delta = 6.28% after solid solution at 370 degrees C for 1 h, water quenching, and ageing at 38 degrees C for 20 h; and those of the alloy with the optimum constituent (Mg-7Li-14Zn-0.57La-1.22Nd-1. 0Ce-1. 6Ag)([7]) are sigma(b) = 405.1 MPa, sigma(0.2) = 201. 1 MPa, delta = 8.98 % after the same treatment. Finally, the ageing processes of the ternary alloy and the optimum alloy were observed through X-ray diffraction spectrums.