Journal
WEAR
Volume 303, Issue 1-2, Pages 602-610Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.wear.2013.04.006
Keywords
Ag-Cu alloy; Wear; Microstructure; Work hardening; Mechanical mixing
Funding
- NSF [DMR 09-06703]
- US Department of Energy [DE-FG02-07ER46453, DE-FG02-07ER46471]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0906703] Funding Source: National Science Foundation
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Dry sliding wear behavior of nanostructured eutectic Ag-Cu with grain size similar to 114 nm was investigated using pin-on-disc testing. The subsurface microstructure and texture evolution were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, nano-beam diffraction, and high angle annular dark field. During sliding wear, plastic deformation transforms the subsurface material into hierarchical microstructures. At depths of 1-15 mu m below the sliding surface, a two phase (Ag-rich and Cu-rich) nano-lamellar structure is observed, where the layer thickness decreases from 98 nm at a depth of 15 mu m to 11 nm at a depth of 1 mu m. Right below the sliding surface, where an equivalent strain of 7.1 was estimated, wear induced plastic deformation drives the subsurface material into a non-equilibrium super-saturated solid solution phase, with similar to 9 nm equiaxed nano-grains. These refined microstructures led to significant work-hardening in the subsurface material, as revealed by nanoindentation testing. Finally, the microstructure evolution and the underlying deformation mechanism of Ag-Cu are discussed on the basis of these characterizations. (C) 2013 Elsevier B.V. All rights reserved.
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