Effect of Sub-T-g Annealing on the Corrosion Resistance of the Cu-Zr Amorphous Alloys
- Authors
- Shin, Sang-Soo; Kim, Hong-Kyu; Lee, Jae-Chul; Park, Ik-Min
- Issue Date
- Mar-2018
- Publisher
- CHINESE ACAD SCIENCES, INST METAL RESEARCH
- Keywords
- Amorphous alloys; Corrosion; Annealing; Molecular dynamics; Electrochemical performance
- Citation
- ACTA METALLURGICA SINICA-ENGLISH LETTERS, v.31, no.3, pp 273 - 280
- Pages
- 8
- Indexed
- SCIE
SCOPUS
- Journal Title
- ACTA METALLURGICA SINICA-ENGLISH LETTERS
- Volume
- 31
- Number
- 3
- Start Page
- 273
- End Page
- 280
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/76832
- DOI
- 10.1007/s40195-017-0637-9
- ISSN
- 1006-7191
2194-1289
- Abstract
- 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 Cu50Zr50 amorphous alloy with different degrees of short-range order, which were prepared by annealing below the glass transition temperature (T-g). It was found that the corrosion resistance of amorphous alloys is improved to a significant level when the alloys were heated below T-g. Calorimetric studies showed that thermally activated relaxation process of created disorder, which occurs during sub-T-g annealing, 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-T-g annealing on the improvement in the corrosion resistance of the amorphous alloys from the viewpoint the relaxation process of the short-range orders.
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