Ductile behavior and excellent corrosion resistance of Mg-Zn-Yb-Ag metallic glasses

Magnesium-based metal glasses (MMGs) have broad application potential as bio-implant materials because of their disordered atomic structure, fine degradability, low elasticity modulus, and high strength. However, their low plasticity and poor corrosion resistance limit their application. In the present study, Mg-Zn-Yb-Ag metallic glasses were fabricated by injecting into a copper roller. The addition of trace amounts of ytterbium (Yb) and precious metal silver significantly improved the ductility of MMGs under bending and tensile loading. The results show that the amorphous alloy with 4 at% of Yb exhibits optimum specific strength mainly because of high-density coarsening shear bands. Electrochemical experiments, immersion test, and analysis of corrosion products by XPS and EDS after immersion showed that the amorphous alloy with 4 at% of Yb exhibits the greatest corrosion resistance among the four samples because of rare earth (Yb) oxide film. The addition of the appropriate amount of the rare-earth element Yb to amorphous Mg-based alloys can not only remarkably influence the alloy plasticity but also improve the alloy corrosion resistance, thereby increasing the alloy application prospects. (c) 2021 Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license (http:// creativecommons.org/licenses/by-nc-nd/4.0/).

Automated summary

The study fabricated Mg-Zn-Yb-Ag metallic glasses by injecting into a copper roller, showing improved ductility under bending and tensile loading with the addition of trace amounts of ytterbium and precious metal silver. The amorphous alloy with 4 at% of Yb exhibited the greatest corrosion resistance due to a rare earth oxide film, indicating the potential of rare-earth element Yb in influencing alloy plasticity and corrosion resistance for better application prospects.