Journal
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
Volume 644, Issue -, Pages 79-84Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.msea.2015.07.050
Keywords
Metal matrix composites; Nanoindentation; Aging; Interface structure; Dislocation distribution
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Funding
- National Basic Research Program of China (973 Program) [2012CB619600]
- National High-Tech R&D Program of China (863 Program) [2013AA031201]
- National Natural Science Foundation of China [51471190]
- Science and Technology Commission of Shanghai Municipality (STCSM) [13PJ1404000, 14DZ2261200]
- Office of Naval Research (ONR) [ONR N00014-12-1-0237]
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In particulate-reinforced metal matrix composites (MMCs), geometrically necessary dislocations (GNDs) form in the vicinity of reinforcement/matrix interfaces. In this study, the hardness distribution across the interface was studied using nanoindentation with high spatial resolution, for composites treated under different aging conditions. The size of the GND punched zone, as determined from the hardness measurement, was found to be in agreement with that estimated by transmission electron microscopy (TEM). Mechanical characterization of bulk composites revealed a reduction in failure strain with decreasing punched zone size, while the strength of the composites was found to depend more on the intrinsic strength of the matrix alloy. These observations were interpreted in terms of the load transfer capacity between the matrix and reinforcement through the interface. (C) 2015 Elsevier B.V. All rights reserved.
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