Mg-based bulk metallic glass composite with high bio-corrosion resistance and excellent mechanical properties

An in situ formed Mg75Cu13.33Y6.67Zn5 bulk metallic glass composite with both excellent high bio-corrosion resistance and superior mechanical properties has been synthesized. The composite shows a significant plastic strain of about 19% and high compressive strength of about 1040 MPa. Attributed to the glassy matrix that postpones the growth of corrosion pits, the composite displays high pitting potential and low corrosion current density. The corrosion current density is about two orders of magnitude lower than AZ31 alloy. The composite presents a uniform corrosion morphology with micro-scale uniformly distributed corrosion pits. Electrochemical impedance spectroscopy for composite alloy consists only of single capacitive loop.