Journal
SCRIPTA MATERIALIA
Volume 65, Issue 3, Pages 179-182Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2011.03.036
Keywords
Nanoindentation; Dislocation nucleation; Pop-in; Crystal structure; Activation energy
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Funding
- National Science Foundation [NSF DMR-0905979]
- US Department of Energy, Office of Basic Energy Sciences, Materials Sciences and Engineering Division
- Tennessee Agricultural Experiment Station
- University of Tennessee College of Engineering
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0905979] Funding Source: National Science Foundation
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Nanoindentation tests were performed on single crystals of Mo and Ni. The critical shear stress for the first pop-in was similar to 1/7 of the shear modulus in both crystals. The dependence of pop-in probability on load was understood in terms of a thermally activated dislocation nucleation process. Comparison of the activation energies suggests nucleation of full dislocations in Mo and partial dislocations in Ni. The activation energy analysis also offers information on the specific slip system on which dislocations are nucleated. (C) 2011 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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