THE OXIDATION PROCESS IN THE TEXTURED THIN TAPES OF BINARY COPPER-BASED ALLOYS

  • Teona Suaridze M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
  • Yuliya Khlebnikova M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
  • Dmitry Rodionov M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
  • Lada Egorova M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences
Keywords: textured tapes, binary copper alloys, oxidation, surface structure, complex oxides

Abstract

In the present work, the authors studied the development of the oxidation process in some binary copper alloys (Cu – 40 % Ni, Cu – 30 % Ni, Cu – 1.6 % Fe, Cu – 0.4 % Cr). The authors determined the principal locations for the formation of corrosion centers on the surface of textured tape substrates of Cu–Me alloys (where Me=Ni, Cr, Fe) after annealing in an oxidizing atmosphere for 5, 30, and 250 min at the temperature of 700 °С. The study established that the oxidation of the surface of thin tapes of Cu – 0.4 % Cr and Cu – 1.6 % Fe alloys is not homogeneous, in contrast to the Cu – 40 % Ni and Cu – 30 % Ni alloys. The corrosion centers formed more intensively on the segregated particles of the alloying element – pure chromium or iron with a bcc lattice.

The study discovered that the oxide film formed as a result of prolonged annealing, in Cu–Cr and Cu–Fe alloys, has a greater thickness in the zone of grain boundaries. According to the X-ray spectrum analysis, in the spectra taken from the boundaries, the higher oxygen content is registered than in the central zone of a grain.

The study shows that in the textured tapes of Cu–Cr and Cu–Fe alloys, both the surface oxidation and internal oxidation of tapes occur in the process of short-term annealing (700 °С, 5 and 30 min). As a result of electron-diffraction analysis, the authors identified that, in the course of oxidation, a layer of complex spinel-type CuMe2O4 (Me=Cr, Fe) oxide appears on the alloying element particles during the annealing, and the dispersed copper oxides, mainly Cu2O with a small quantity of CuO, are produced in the copper matrix.

Author Biographies

Teona Suaridze , M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

junior researcher

Yuliya Khlebnikova , M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

PhD (Engineering), leading researcher

Dmitry Rodionov , M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

Doctor of Sciences (Physics and Mathematics), chief researcher

Lada Egorova , M.N. Mikheev Institute of Metal Physics of Ural Branch of Russian Academy of Sciences

PhD (Engineering), senior researcher

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Published
2019-12-30
Section
Technical Sciences