Abstract
AbstractMicrostructure evolution and bio‐corrosion behaviors of as‐cast Mg‐3Zn‐0.4Zr‐xY (x = 0, 1, 2, 3 and 4 wt.%) alloys were studied by using optical microscope, x‐ray diffractometer, transmission electron microscopy, scanning electron microscope, immersion test and electrochemical measurement. Results indicated that yttrium addition led to significant grain refinement and to the formation of I‐phase (Mg3YZn6) and W‐phase (Mg3Y2Zn3). The volume fraction of I‐phase is dramatically increased after 2 wt% yttrium addition, and the corrosion resistance is improved, while further addition reverses the effect, due to the rising W‐phase, which increases the amount of cathodic sites and accelerates the galvanic corrosion process.
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