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Only trace Ca addition to the Mg–2Gd–0.5Zn–0.2Zr (at.%) alloy leads to the precipitation of Guinier-Preston (GP) zones and remarkably improves the creep resistance at elevated temperatures. The Mg–2Gd–0.5Zn–0.4Ca–0.2Zr alloy exhibits a minimum creep rate of 5.75×10−8s−1 tested at 250°C and 110MPa, its superior creep resistance is attributed to the precipitation of dense GP zones on the basal plane,...
The addition of a small amount of Zr to a Mg–6.2Zn (Z6) binary alloy causes a substantial increase in the tensile yield strength of the extruded form of this alloy. This is attributed to the formation of thermally stable fine Mg(Zn,Zr) precipitates, which refine the extruded microstructure. A fine dispersion of β′1 and β′2 precipitates within the refined grains after T6 aging at 160°C results in a...
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