Materials Science. Non-Equilibrium Phase Transformations.
Vol. 7 (2021), Issue 2, pg(s) 49-51

Investigation of the mg supersaturated solid solution decomposition in the Mg-Dy-Sm alloys

  • 1 Institution of Russian Academy of Sciences. A.A. Baikov Institute of Metallurgy and Material Science RAS, Russia

Abstract

Kinetics and phase transformations during decomposition of the supersaturated Mg solid solution in the Mg-Dy-Sm alloys at different Dy/Sm content ratios were investigated in this work. The solid solution decomposition occurs upon aging at a temperature of 200°C, at which strengthening of the alloys was expected to be highest. With increasing Dy/Sm ratio, the solid solution decomposition gradually decelerates. Addition of Dy to the Mg-Sm alloys intnsifies the age hardening, and the addition of Sm to the Mg-Dy alloys also promotes the hardening. The Mg solid solution decomposition in the ternary Mg-Dy-Sm alloys is accompanied by the formation of the GPzones, ordering, and the precipitation of plate-like particles in certain planes of the Mg crystal lattice. Such processes are typical of solid solution decomposition in the binary Mg-Re (Nd, Sm, Y, Gd, Tb, Dy) alloys.

Keywords

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