Elemental separation in nanocrystalline Cu-Al alloys

Y. B. Wang, X. Z. Liao, Y. H. Zhao, J. C. Cooley, Z. Horita, Y. T. Zhu

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Abstract

Nanocrystallization by high-energy severe plastic deformation has been reported to increase the solubility of alloy systems and even to mix immiscible elements to form non-equilibrium solid solutions. In this letter, we report an opposite phenomenon - nanocrystallization of a Cu-Al single-phase solid solution by high-pressure torsion separated Al from the Cu matrix when the grain sizes are refined to tens of nanometers. The Al phase was found to form at the grain boundaries of nanocrystalline Cu. The level of the separation increases with decreasing grain size, which suggests that the elemental separation was caused by the grain size effect.

Original languageEnglish
Article number231912
JournalApplied Physics Letters
Volume102
Issue number23
DOIs
Publication statusPublished - Jun 10 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Wang, Y. B., Liao, X. Z., Zhao, Y. H., Cooley, J. C., Horita, Z., & Zhu, Y. T. (2013). Elemental separation in nanocrystalline Cu-Al alloys. Applied Physics Letters, 102(23), [231912]. https://doi.org/10.1063/1.4811157