Ductile behavior and excellent corrosion resistance of Mg-Zn-Yb-Ag metallic glasses
| Autor: | Lu Wenbing, Dan Yu, Aiying Chen, He Meifeng, Shuai Wang, Xie Xiaoming, Hao Wang, Chenggong Yuan |
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| Rok vydání: | 2021 |
| Předmět: |
Materials science
Amorphous metal Superplastic Mechanical Engineering Alloy Corrosion resistance Oxide chemistry.chemical_element engineering.material Copper Shear bands Corrosion Amorphous solid chemistry.chemical_compound chemistry Magnesium-based amorphous alloy Mechanics of Materials Ultimate tensile strength TA401-492 engineering General Materials Science Composite material Ductility Materials of engineering and construction. Mechanics of materials |
| Zdroj: | Materials & Design, Vol 210, Iss, Pp 110027-(2021) |
| ISSN: | 0264-1275 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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