Abstract
The effects of Zr addition on the as cast microstructure, tensile and creep properties of Mg–3·8Zn–2·2Ca (wt-%) magnesium alloy were investigated. The results indicate that adding 0·19–0·81 wt-%Zr to the Mg–3·8Zn–2·2Ca does not cause the formation of any new phases but causes the morphology of the Ca2Mg6Zn3 phase to change from the initial continuous and/or quasi-continuous net to the quasi-continuous and/or disconnected shapes. Furthermore, adding 0·19–0·81 wt-%Zr can effectively refine the grains of the Mg–3·8Zn–2·2Ca alloy, and an increase in Zr amount from 0·19 to 0·81 wt-% causes the grain size to gradually decrease. In addition, adding 0·19–0·81 wt-%Zr to the Mg–3·8Zn–2·2Ca alloy can improve the tensile properties but decreases the creep properties. Among these Mg–3·8Zn–2·2Ca alloys with the additions of 0·19, 0·52 and 0·81 wt-%Zr, the alloy with the addition of 0·81 wt-%Zr exhibits the relatively optimal tensile and creep properties.
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