Abstract
The influences of Ca and Ce/La microalloying on the microstructure evolution and bio-corrosion resistances of extruded Mg-Zn alloys have been systematically investigated in the current study. Compared with single Ca or Ce/La addition, the Ca-Ce/La cooperative microalloying results in an outstanding grain refinement, because the fine secondary phase particles effectively hinder the recrystallized grain growth. The coarse Ca 2 Mg 6 Zn 3 phases promote the formation of Ca 3 (PO 4 ) 2 or hydroxyapatite particles during the immersion process and accelerate the dissolution of the corrosion product film, which destroys its integrity and results in the deterioration of anti-corrosive performance. The Ce/La elements can be dispersed within the conventional Mg 7 Zn 3 phases, which reduce the internal galvanic corrosion between Mg matrix and the secondary phases, leading to an obvious improvement of corrosion resistance. Therefore, the Ca-Ce/La cooperative microalloying achieves a homogenous fine-grained microstructure and improves the protective ability of surface film, which will pave a new avenue for the design of biomedical Mg alloys in the coming future.
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