Mg-0.7Zn-1.4at%Y alloys annealed at low temperatures after quenching in water from 520C were studied by high-resolution transmission electron microscopy and high-angle annular detector dark-field scanning transmission electron microscopy. Stacking faults, thin bands of a 14H-type long-period stacking phase and relatively thick bands of long-period stacking were precipitated in α-Mg crystalline grains by annealing at 300, 400 and 500C, respectively. The precipitation of stacking faults, long-period stacking phase and a supersaturated solid solution without any precipitates were reversibly transformed by annealing at low temperatures. It could be concluded that the stacking faults and long-period stacking phase were stabilized by the segregation of Zn and Y from a supersaturated solid solution.

Stabilization of Stacking Faults and a Long Period Stacking Phase Dispersed in α-Mg Crystalline Grains of Mg-0.7at%Zn-1.4at%Y Alloy. J.Lee, K.Sato, T.J.Konno, K.Hiraga: Materials Transactions, 2009, 50[1], 222-5