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A search for evidence of strain gradient hardening in Au submicron pillars under uniaxial compression using synchrotron X-ray microdiffraction

Budiman, A. S. and Han, S. M. and Greer, J. R. and Tamura, N. and Patel, J. R. and Nix, W. D. (2008) A search for evidence of strain gradient hardening in Au submicron pillars under uniaxial compression using synchrotron X-ray microdiffraction. Acta Metallurgica et Materialia, 56 (3). pp. 602-608. ISSN 0956-7151. https://resolver.caltech.edu/CaltechAUTHORS:20170408-144528730

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Abstract

When crystalline materials are mechanically deformed in small volumes, higher stresses are needed for plastic flow. This has been called the “smaller is stronger” phenomenon and has been widely observed. Various size-dependent strengthening mechanisms have been proposed to account for such effects, often involving strain gradients. Here we report on a search for strain gradients as a possible source of strength for single-crystal submicron pillars of gold subjected to uniform compression, using a submicron white-beam (Laue) X-ray diffraction technique. We have found, both before and after uniaxial compression, no evidence of either significant lattice curvature or subgrain structure. This is true even after 35% strain and a high flow stress of 300 MPa were achieved during deformation. These observations suggest that plasticity here is not controlled by strain gradients or substructure hardening, but rather by dislocation source starvation, wherein smaller volumes are stronger because fewer sources of dislocations are available.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2007.10.031DOIArticle
ORCID:
AuthorORCID
Greer, J. R.0000-0002-9675-1508
Additional Information:© 2007 Acta Materialia Inc. Published by Elsevier Ltd. Received 23 May 2007, Revised 12 October 2007, Accepted 13 October 2007, Available online 19 December 2007. This work was supported by the Office of Science, Office of Basic Energy Sciences, of the US Department of Energy under Contract Nos. DE-FG02-04ER46163 and DE-AC02-05CH11231. Additional support though an NSF-EU Collaborative Research Program: NANOMESO under NSF Grant No. 0502208 is gratefully acknowledged.
Funders:
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-04ER46163
Department of Energy (DOE)DE-AC02-05CH11231
NSFDMR-0502208
Subject Keywords:Materials with reduced dimensions; Size effects; Dislocation; Synchrotron radiation; X-ray diffraction (XRD)
Issue or Number:3
Record Number:CaltechAUTHORS:20170408-144528730
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20170408-144528730
Official Citation:A.S. Budiman, S.M. Han, J.R. Greer, N. Tamura, J.R. Patel, W.D. Nix, A search for evidence of strain gradient hardening in Au submicron pillars under uniaxial compression using synchrotron X-ray microdiffraction, Acta Materialia, Volume 56, Issue 3, February 2008, Pages 602-608, ISSN 1359-6454, https://doi.org/10.1016/j.actamat.2007.10.031. (http://www.sciencedirect.com/science/article/pii/S1359645407006994)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:76002
Collection:CaltechAUTHORS
Deposited By: 1Science Import
Deposited On:04 May 2017 19:30
Last Modified:03 Oct 2019 16:56

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