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High temperature creep strength at 650K and microstructures of Mg-Y-Zn-based alloys with fourth elements (nickel and calcium) have been investigated. The microalloying of 0.5mass % calcium markedly increases the stacking fault density in the Mg-3mass%Y-0.5mass%Zn alloy. Furthermore, the addition of calcium can decrease the size of stacking faults. On the other hand, in the nickel-added alloy, many precipitates were formed and the estimated stacking faults density decreased significantly. The creep strength of the Mg-Y-Zn-Ca alloy is higher than that of the base alloy (Mg-3mass%Y-0.5mass%Zn, WZ305). Transmission electron microscopic (TEM) observations revealed that many a-dislocations on the basal planes in the magnesium matrix are extended during creep deformation in Mg-Y-Zn-based alloys. There was significant consumption of solute atoms in the matrix and deterioration of creep strength in the Mg-Y-Zn-Ni alloy, because the formation of a large number of precipitates began before creep. On the other hand, both the low mobile dislocation density and the large separation width of extended a-dislocations were observed in the Mg-Y-Zn-Ca alloy, which exhibits excellent creep strength at 650K under 20MPa. [doi:10.2320/matertrans.MC200722

Microalloying Effects of Ca and Ni on High-Temperature Creep Behavior in Mg-Y-Zn Alloys