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Crystallographic orientation and size dependence of tension–compression asymmetry in molybdenum nano-pillars

Kim, Ju-Young and Jang, Dongchan and Greer, Julia R. (2012) Crystallographic orientation and size dependence of tension–compression asymmetry in molybdenum nano-pillars. International Journal of Plasticity, 28 (1). pp. 46-52. ISSN 0749-6419. http://resolver.caltech.edu/CaltechAUTHORS:20111223-090231432

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Abstract

Uniaxial tension and compression experiments on [0 0 1] and [0 1 1] oriented molybdenum nano-pillars exhibit tension–compression asymmetry, a difference in attained stresses in compression vs. tension, which is found to depend on crystallographic orientation and sample size. We find that (1) flow stresses become higher at smaller diameters in both orientations and both loading directions, (2) compressive flow stresses are higher than tensile ones in [0 0 1] orientation, and visa versa in [0 1 1] orientation, and (3) this tension–compression asymmetry is in itself size dependent. We attribute these phenomena to the dependence of twinning vs. antitwinning deformation on loading direction, to the non-planarity of screw dislocation cores in Mo crystals, and to the possibly lesser role of screw dislocations in governing nano-scale plasticity compared with bulk Mo.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.ijplas.2011.05.015 DOIArticle
http://www.sciencedirect.com/science/article/pii/S0749641911000994PublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2011 Elsevier Ltd. Received 15 December 2010; revised 21 April 2011; Available online 12 June 2011. This work was supported by Office of Naval Research under Grant No. N00014-09-1-0883. The authors gratefully acknowledge A. Buxbaum from FEI Company for TEM sample preparation, and critical support and infrastructure for this work provided by the Kavli Nanoscience Institute (KNI) at Caltech.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014-09-1-0883
Subject Keywords:Dislocations; Microstructures; Metallic material; Mechanical testing; Nano-scale plasticity; Nano-scale plasticity
Record Number:CaltechAUTHORS:20111223-090231432
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20111223-090231432
Official Citation:Ju-Young Kim, Dongchan Jang, Julia R. Greer, Crystallographic orientation and size dependence of tension–compression asymmetry in molybdenum nano-pillars, International Journal of Plasticity, Volume 28, Issue 1, January 2012, Pages 46-52, ISSN 0749-6419, 10.1016/j.ijplas.2011.05.015.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28584
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:09 Jan 2012 19:19
Last Modified:23 Aug 2016 10:08

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