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

Ren, F. and Arshad, S. N. and Bellon, P. and Averback, R. S. and Pouryazdan, M. and Hahn, H. (2014):
Sliding wear-induced chemical nanolayering in Cu–Ag, and its implications for high wear resistance.
In: Acta Materialia, PERGAMON-ELSEVIER SCIENCE LTD, England, pp. 148-158, 72, ISSN 13596454,
[Online-Edition: http://dx.doi.org/10.1016/j.actamat.2014.03.060],
[Article]

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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Item Type: Article
Erschienen: 2014
Creators: Ren, F. and Arshad, S. N. and Bellon, P. and Averback, R. S. and Pouryazdan, M. and Hahn, H.
Title: Sliding wear-induced chemical nanolayering in Cu–Ag, and its implications for high wear resistance
Language: English
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. (C) 2014 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.

Journal or Publication Title: Acta Materialia
Volume: 72
Publisher: PERGAMON-ELSEVIER SCIENCE LTD, England
Uncontrolled Keywords: Copper alloys, Wear, Deformation structures, Self-organization and patterning, High-pressure torsion
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Joint Research Laboratory Nanomaterials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 10 Feb 2016 09:58
Official URL: http://dx.doi.org/10.1016/j.actamat.2014.03.060
Identification Number: doi:10.1016/j.actamat.2014.03.060
Funders: This research was supported by the NSF under Grants DMR 09-06703, DMR 10-05813, and MRI 0923428., The work was carried out in part in the Frederick Seitz Materials Research Laboratory Central Facilities, University of Illinois, which are partially supported by the U.S. Department of Energy under Grants DE-FG02-07ER46453 and DE-FG02-07ER46471.
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