Abstract
In this paper, the as-cast microstructures, tensile and creep properties of Mg–3.8Zn–2.2Ca–xGd (x=0, 0.36, 0.88, 1.49 and 2.52wt%) magnesium alloys are investigated and compared. The results indicate that the additions of 0.36–2.52wt%Gd to the Mg–3.8Zn–2.2Ca ternary alloy can refine the grains of the alloy, and an increase in Gd content from 0.36wt% to 2.52wt% causes the grain size to gradually decrease. Furthermore, the additions of 0.36–2.52wt%Gd to the Mg–3.8Zn–2.2Ca ternary alloy can also improve the tensile properties of the alloy, and the alloy with the addition of 1.49wt%Gd exhibits the best tensile properties. In addition, the additions of 0.36–2.52wt%Gd to the Mg–3.8Zn–2.2Ca ternary alloy do not change the creep mechanism of the alloy. However, the creep properties of the Gd-containing alloys are improved, and an increase in Gd content from 0.36wt% to 2.52wt% causes the creep properties to gradually increase. Amongst the Gd-containing alloys with the additions of 0.36wt%, 0.88wt%, 1.49wt% and 2.52wt%Gd, the alloy with the addition of 1.49wt%Gd exhibits the relatively optimal tensile and creep properties.
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