Sliding wear-induced chemical nanolayering in Cu-Ag, and its implications for high wear resistance

F. Ren, S. N. Arshad, P. Bellon, R. S. Averback, M. Pouryazdan, H. Hahn

Research output: Contribution to journalArticle

Abstract

Sliding friction of metallic materials results in severe plastic deformation of the contacting surfaces. While plastic deformation is generally considered detrimental, as it leads to localized material failure and wear, in some cases it can trigger the formation of self-organized microstructures with the potential for improved wear resistance. We report here on a novel, self-adapting mechanism in a Cu90Ag10 two-phase alloy that relies on the spontaneous formation of chemically nanolayered structures during sliding wear. For sufficiently large initial Ag precipitate sizes, the nanolayered structures remain stable up to the sliding surface, leading to a reduction in wear rate. Similar chemically nanolayered structures are observed in Cu90Ag10 alloys deformed by high-pressure torsion, enabling controlled investigation of this process. The results of these studies suggest a novel approach, through self-organization, for designing metallic alloys that can achieve low wear rates.

Original languageEnglish (US)
Pages (from-to)148-158
Number of pages11
JournalActa Materialia
Volume72
DOIs
StatePublished - Jun 15 2014

Keywords

  • Copper alloys
  • Deformation structures
  • High-pressure torsion
  • Self-organization and patterning
  • Wear

ASJC Scopus subject areas

  • Ceramics and Composites
  • Metals and Alloys
  • Polymers and Plastics
  • Electronic, Optical and Magnetic Materials

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