期刊
ACTA MATERIALIA
卷 72, 期 -, 页码 148-158出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2014.03.060
关键词
Copper alloys; Wear; Deformation structures; Self-organization and patterning; High-pressure torsion
资金
- NSF [DMR 09-06703, DMR 10-05813, MRI 0923428]
- Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois
- U.S. Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1005813] Funding Source: National Science Foundation
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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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