Abstract
Micro-alloying of Ca in Mg–1Zn-0.3Nd (wt.%) alloy is found to significantly improve tensile strength and process high ductility simultaneously. It closely correlates with grain refinement and the increased coherent nano Mg2Ca and (Mg, Zn)3Nd precipitates. Ca addition enhances alloying elements co-segregation at grain boundary and promotes grain refinement. Furthermore, nano Mg2Ca particles induced by Ca addition can significantly promote the precipitation of (Mg, Zn)3Nd phase via the heterogeneous nucleation mechanism owing to their excellent coherency relationship and ultimately lead to the pronounced strengthening effect. In addition, both fine grains and the coherent characteristics between Mg2Ca, (Mg, Zn)3Nd, and Mg matrix facilitate strain coordination during deformation and yield relatively high ductility.
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