QUENCHING AND AGEING BEHAVIORS OF Mg-Li-Zn ALLOY
(Department of Metal Forming; School of Material and Metallurgy; P. O. Box 317; Northeastern University; Shenyang 110006)
Abstract: 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 ℃ for 1 h, and water quenching. The experiments indicates that the mechanical properties of the ternary alloy are σb=305.1 MPa, σ 0.2 =191.8 MPa, δ =6.28% after solid solution at 370 ℃ for 1 h, water quenching, and ageing at 38 ℃ for 20 h; and those of the alloy with the optimum constituent (Mg-7Li-14Zn-0.57La- 1.22Nd-1.0Ce-1.6Ag) are σb=405.1 MPa, σ 0.2 =201.1 MPa, δ = 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.
Key words: Mg-Li-Zn quenching ageing