Journal
THIN SOLID FILMS
Volume 571, Issue -, Pages 260-267Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.tsf.2014.06.022
Keywords
Metal-ceramic composite; Multilayers; Layer thickness; Nanolaminate; High temperature nanomechanics; Nanoindentation
Categories
Funding
- National Science Foundation of the US
- Spanish Ministry of Economy and Competitiveness under the Materials World Network Program through the project High temperature mechanical behavior of metal/ceramic nanolaminate composites [NSF-DMR-1209988, PCIN-2013-029]
- US DOE, Office of Basic Energy Sciences
- Spanish Ministry of Economy and Competitiveness [MAT2012-31889]
- European Commission through the project RADINTERFACES [263273]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1209928] Funding Source: National Science Foundation
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Composite laminates on the nanoscale have shown superior hardness and toughness, but little is known about their high temperature behavior. The mechanical properties (elastic modulus and hardness) were measured as a function of temperature by means of nanoindentation in Al/SiC nanolaminates, a model metal-ceramic nanolaminate fabricated by physical vapor deposition. The influence of the Al and SiC volume fraction and layer thicknesses was determined between room temperature and 150 degrees C and, the deformation modes were analyzed by transmission electron microscopy, using a focused ion beam to prepare cross-sections through selected indents. It was found that ambient temperature deformation was controlled by the plastic flow of the Al layers, constrained by the SiC, and the elastic bending of the SiC layers. The reduction in hardness with temperature showed evidence of the development of interface-mediated deformation mechanisms, which led to a clear influence of layer thickness on the hardness. (C) 2014 Elsevier B.V. All rights reserved.
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