Journal
SCRIPTA MATERIALIA
Volume 162, Issue -, Pages 63-67Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2018.10.045
Keywords
Micro-mechanical testing; Size effect; Intrinsic; Extrinsic
Categories
Funding
- National Science Foundation CAREER award [DMR-1752636]
- US Nuclear Regulatory Commission [NRC-HQ-84-14-G-0056]
- Purdue University
- US DOE Office of Nuclear Energy under DOE Idaho Operations Office as part of the Nuclear Science User Facilities experiments [DE-AC07-051D14517, 16-656, 18-1168]
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Miniaturized mechanical tests are commonly utilized to evaluate properties of materials, including thin films, nanostructured, and irradiated materials. However, the specimen size effect occurs when miniaturized sample geometries contain too few dislocation sources, resulting in elevated yield stresses. The size effect is controlled by extrinsic (specimen dimensions) and intrinsic (microstructure) factors. Here, we summarize extrinsic and intrinsic size effects from micro-compression pillar, micro-cantilever bend, and flexure studies reported in the archival literature. We find an approximately linear relationship between intrinsic and extrinsic size effects. Meaningful mechanical properties can be measured when extrinsic size dominates the intrinsic size. (C) 2018 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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