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Effect of grain size on oxidation behaviour of Ag-20Cu-30Cr alloys in 0.1 MPa pure O2 at 700 and 800 °C

  • Xinyue Fan , Yang Han , Jiarui Yu , Changwei Li , Zhongqiu Cao EMAIL logo , Ke Zhang , Yan Wang and Shigang Xin
Published/Copyright: January 5, 2023
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 114 Issue 2

Abstract

Bulk three-phase nanocrystalline (NC) Ag-20Cu-30Cr alloy was obtained by hot-pressing mechanically alloyed powders, and oxidation tests were completed in 0.1 MPa pure O2 at 700 and 800 °C. The oxidation behaviour of the alloy and the effect of the grain size were also studied in comparison with the previous coarse-grained (CG) Ag-20Cu-30Cr alloy prepared by a powder metallurgy route. At the two temperatures the oxidation kinetic curves of the NC Ag-20Cu-30Cr alloy are composed of three parabolic stages, and their parabolic rate constants become smaller as the oxidation time increases. The oxidation rate at 700 °C is higher before 5 h, but lower after 5 h than that at 800 °C. Furthermore, the oxidation rate of the NC Ag-20Cu-30Cr alloy is lower than that of the CG Ag-20Cu-30Cr alloy at the same temperature. Moreover, the NC Ag-20Cu-30Cr alloy forms an outer oxide layer composed of the Cu oxides and double oxides of the metallic Ag, Cu and Cr as well as an inner regular, continuous and protective chromia layer. Thus, the Ag-20Cu-30Cr alloy can complete the transition from an internal to external oxidation of the reactive component Cr, and in the end form a regular, continuous and protective chromia layer after nanocrystallization.

Keywords: Ag–Cu–Cr alloy; High-temperature oxidation; Mechanical alloying; Nanocrystalline; Powder metallurgy
Corresponding author: Zhongqiu Cao, College of Chemistry and Chemical Engineering, Shenyang Normal University, Shenyang 110034, P. R. China, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: Authors are very grateful for the financial supports from the National Natural Science Foundation of China (51271127), and the Liaoning Provincial Key Research and Development Program of China (2018304025).

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

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Received: 2021-10-11
Accepted: 2022-03-31
Published Online: 2023-01-05
Published in Print: 2023-02-23

© 2022 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.1515/ijmr-2021-8599
Keywords for this article
Ag–Cu–Cr alloy; High-temperature oxidation; Mechanical alloying; Nanocrystalline; Powder metallurgy

Articles in the same Issue

  1. Frontmatter
  2. Review
  3. Preparations and applications of organic conducting polymers/graphene composites in heavy metal ion sensing: a review
  4. Original Papers
  5. Complex dielectric, electric modulus, impedance, and optical conductivity of Sr3−x Pb x Fe2TeO9 (x = 1.50, 1.88 and 2.17)
  6. Complex permittivity and predominance of non-overlapping small-polaron tunneling conduction process in copper indium selenide compound
  7. Effect of Bacillus and Pseudomonas biofilms on the corrosion behavior of AISI 304 stainless steel
  8. Fabrication of magnesium oxide nanoparticles using Eucalyptus tereticornis seed extract and their characterisation
  9. Greener route for synthesis of cerium oxide and Fe-doped cerium oxide nanoparticles using acacia concinna fruit extract
  10. Phase equilibria of Ni–Al–Pd and Ni–Cr–Pd ternary systems and Ni–Al–Cr–Pd quaternary system at 1423 K
  11. Effect of grain size on oxidation behaviour of Ag-20Cu-30Cr alloys in 0.1 MPa pure O2 at 700 and 800 °C
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  13. DGM – Deutsche Gesellschaft für Materialkunde
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