Abstract
In this study, X-ray microtomography results aided with fractography have been utilised to elucidate the effect of distribution of the secondary phases on the damage mechanism of the Mg-4Zn-xCa (x = 0, 0.2, 0.4, 0.6, 1.0 wt%) alloys. The alloy Mg-4Zn exhibited 2-phase microstructure comprising of α-Mg matrix and second phase (MgZn), which converted to interconnected network of Ca2Mg6Zn3 phase along grain boundaries with increase in Ca content. The compressive strength increased with the increase in Ca content up to 0.4 wt% due to the formation of Ca2Mg6Zn3 phase. However, it further decreased due to easier crack propagation through the 3D network of Ca2Mg6Zn3 at grain boundaries.
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