Abstract
The microalloying effects of Y on the microstructure, mechanical properties and bio-corrosion resistances of Mg69Zn27Ca4 (at.%) alloy were investigated by X-ray diffraction, compressive tests and electrochemical treatments, respectively. The Y-bearing Mg–Zn–Ca alloys were found to possess an ultrahigh compressive strength above 1000MPa as well as high specific strength of 3.44×105Nmkg−1. The enhanced mechanical properties can be attributed to the ductile dendrite phase, Mg12YZn, which is dispersed in the matrix with the Y addition. Furthermore, the Y-doped Mg–Zn–Ca alloys studied in this work have much better corrosion resistance than traditional ZK60 and pure Mg alloys in simulated body fluid (SBF) at 37°C, which could be good candidates to be used as biomedical materials.
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