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Size effects in Al nanopillars: Single crystalline vs. bicrystalline

Kunz, Allison and Pathak, Siddhartha and Greer, Julia R. (2011) Size effects in Al nanopillars: Single crystalline vs. bicrystalline. Acta Materialia, 59 (11). pp. 4416-4424. ISSN 1359-6454. http://resolver.caltech.edu/CaltechAUTHORS:20110624-095047405

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Abstract

The mechanical behavior of bicrystalline aluminum nano-pillars under uniaxial compression reveals size effects, a stochastic stress–strain signature, and strain hardening. Pillar diameters range from 400 nm to 2 μm and contain a single, non-sigma high angle grain boundary oriented parallel to the pillar axes. Our results indicate that these bicrystalline pillars are characterized by intermittent strain bursts and exhibit an identical size effect to their single crystalline counterparts. Further, we find that the presence of this particular grain boundary generally decreases the degree of work hardening relative to the single crystalline samples. These findings, along with transmission electron microscopy analysis, show that nano-pillar plasticity in the presence of a grain boundary is also characterized by dislocation avalanches, likely resulting from dislocation nucleation-controlled mechanisms, and that at these small length scales this grain boundary may serve as a dislocation sink rather than a dislocation source.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.actamat.2011.03.065DOIArticle
http://www.sciencedirect.com/science/article/pii/S1359645411002205PublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2011 Acta Materialia Inc. Published by Elsevier Ltd. Received 31 January 2011; received in revised form 25 March 2011; accepted 25 March 2011. Available online 22 April 2011. S.P. gratefully acknowledges the support from the W.M. Keck Institute for Space Studies Postdoctoral Fellowship program. J.R.G. gratefully acknowledges financial support from an NSF Career award (DMR-0748267). The authors also thank Andrew T. Jennings and Carol Garland for TEM assistance and A. Fernandez, A. Jerusalem, and C. Weinberger for useful discussions.
Group:Kavli Nanoscience Institute, Keck Institute for Space Studies
Funders:
Funding AgencyGrant Number
W. M. Keck Institute for Space Studies UNSPECIFIED
NSF DMR-0748267
Subject Keywords:Compression test; Nanoindentation; Electron backscatter diffraction; Interfaces; Aluminum
Record Number:CaltechAUTHORS:20110624-095047405
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110624-095047405
Official Citation:Allison Kunz, Siddhartha Pathak, Julia R. Greer, Size effects in Al nanopillars: Single crystalline vs. bicrystalline, Acta Materialia, Volume 59, Issue 11, June 2011, Pages 4416-4424, ISSN 1359-6454, DOI: 10.1016/j.actamat.2011.03.065. (http://www.sciencedirect.com/science/article/pii/S1359645411002205)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24199
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:24 Jun 2011 18:55
Last Modified:23 Aug 2016 10:02

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