Despite the economy of material cost and excellent toughness of Cu-based amorphous alloys, especially Cu50Zr50, their poor corrosion resistance to a chloride medium limits their widespread applications. In this study, corrosion tests were performed on the Cu50Zr50amorphous alloy with different degrees of short-range order, which were prepared by annealing below the glass transition temperature (Tg). It was found that the corrosion resistance of amorphous alloys is improved to a significant level when the alloys were heated below Tg. Calorimetric studies showed that thermally activated relaxation process of created disorder, which occurs during sub-Tgannealing, is responsible for the improvement in the corrosion resistance. Molecular dynamics simulations performed on the Cu-Zr amorphous alloys demonstrated that the relaxation process of the alloys is associated with the formation of energetically stable icosahedra and icosahedron-like structures. Our study highlights the effects of sub-Tgannealing on the improvement in the corrosion resistance of the amorphous alloys from the viewpoint the relaxation process of the short-range orders.
Bibliographical notePublisher Copyright:
© The Chinese Society for Metals and Springer-Verlag GmbH Germany 2017.
- Amorphous alloys
- Electrochemical performance
- Molecular dynamics
ASJC Scopus subject areas
- Metals and Alloys
- Industrial and Manufacturing Engineering