Abstract
Today, there is a demand for bio-stapler which gradually degraded in the body and disappeared after healing from the medical field. Magnesium is noted as the material with biodegradability and biocompatibility. However, compared with the current material, magnesium have too poor mechanical properties to apply to the stapler. Therefore, it is necessary to improve its mechanical properties. It is known that addition of Ca improves the strength and corrosion resistance. To investigate the effect of alloying element on formability of Mg-Ca alloys, the generalized stacking fault energy was estimated by first-principles calculations for binary Mg-Ca, ternary Mg-Ca-Na, ternary Mg-Ca-K and ternary Mg-Ca-Sr alloys. We suggest that addition of Na, K or Sr reduced plastic anisotropy of binary Mg-Ca alloys.
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