The Mg–6.5Gd–2.5Dy–1.8wt%Zn alloy with high strength and ductility was prepared by conventional casting method. At room temperature, the as-cast alloy with 14H long-period stacking ordered structure exhibited an ultimate tensile strength of 276MPa and elongation to failure of 10.8%, while they were 392MPa and 6.1% for the peak-aged alloy with basal plane stacking faults. The results indicate that the kinking of long-period stacking ordered structure was beneficial for both work hardening and plasticity, and 14H long-period stacking ordered structure contributes more to the improvement of ductility while SF was more effective in increasing strength.

Microstructure and Mechanical Properties of Mg–Gd–Dy–Zn Alloy with Long Period Stacking Ordered Structure or Stacking Faults. J.Zhang, Z.Leng, S.Liu, J.Li, M.Zhang, R.Wu: Journal of Alloys and Compounds, 2011, 509[29], 7717-22