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Mg-6Zn-5Ca-3Ce and Mg-6Zn-5Ca-3Ce-0.5La (wt.%) alloys in the form of rods were prepared by hot extrusion of rapidly solidified powders, produced via atomization of the alloy melt and subsequent splat-quenching between a pair of water-cooled copper rollers. The microstructures and phase constitutions of the alloys were investigated. The results showed that the thermally stable Mg  x  Zn  y RE z   phase with a small amount of Ca was present in the alloys, and its formation may be due to the dissolving of Ca in Mg  x  Zn  y RE z   phase. For the Mg-6Zn-5Ca-3Ce alloy, the grain size ranged from 350 nm to 1 μm. With an addition of 0.5 wt.% La, the microstructure of the alloy was refined, for which the grain size ranged from 300 nm to 500 nm, mainly resulting from the increase in both the number of  RE -containing intermetallics and the melting point of the Mg  x  Zn  y RE z   phase with a small amount of Ca.

Phase constitutions of rapid solidification/powder metallurgy Mg–Zn–Ca– RE alloys