Abstract
The effect of indirect extrusion on microstructural refinement, mechanical properties and corrodibility of the pure Mg and Mg–Ca alloys (up to 3wt.% Ca) in Hank’s solution has been systematically studied. After extrusion, mechanical properties including tensile strength and ductility, and corrosion resistance of the Mg–Ca alloys were greatly enhanced in the Mg–Ca alloys with Ca⩾1%. Effective break-up of (semi-)continuous secondary phase (Mg2Ca) existing along grain boundaries or interdendritic regions during extrusion played a critical role in enhancement of the corrosion resistance of the Mg–Ca alloys with Ca⩾1% compared to the as-cast counterparts.
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