Fabrication and thermal stability of a nanocrystalline Ni-Al-Cr alloy: Comparison with pure Cu and Ni

Keiichiro Oh-ishi, Zenji Horita, David J. Smith, Ruslan Z. Valiev, Minoru Nemoto, Terence G. Langdon

研究成果: Contribution to journalArticle

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A Ni-Al-Cr alloy with an initial grain size of approximately 60 μm was subjected to torsion straining to a strain of approximately 7 at room temperature, thereby reducing the grain size to approximately 34 nm. Similar torsion straining with samples of pure Cu and pure Ni gave grain sizes of approximately 170 and approximately 130 nm, respectively. Inspection of the Ni-Al-Cr alloy after torsion straining revealed highly strained regions containing dislocations associated with lattice distortions but with an absence of any Ni3Al ordered phase. The ultrafine grains in the Ni-Al-Cr alloy were extremely stable at high temperatures, and it was possible to retain a grain size of less than 100 nm after annealing at temperatures up to approximately 900 K. By contrast, there was rapid grain growth in the samples of pure Cu and Ni at annealing temperatures in the vicinity of approximately 500 K. The stability of the grains in the Ni-Al-Cr alloy is attributed to the formation of a Ni3Al-based ordered phase after annealing at approximately 650-700 K. The presence of this phase also leads to an apparent negative slope in the standard Hall-Petch relationship.

元の言語英語
ページ(範囲)4200-4207
ページ数8
ジャーナルJournal of Materials Research
14
発行部数11
DOI
出版物ステータス出版済み - 11 1999

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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    Oh-ishi, K., Horita, Z., Smith, D. J., Valiev, R. Z., Nemoto, M., & Langdon, T. G. (1999). Fabrication and thermal stability of a nanocrystalline Ni-Al-Cr alloy: Comparison with pure Cu and Ni. Journal of Materials Research, 14(11), 4200-4207. https://doi.org/10.1557/JMR.1999.0569