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Effects of size on the strength and deformation mechanism in Zr-based metallic glasses

Jang, Dongchan and Gross, Cameron T. and Greer, Julia R. (2011) Effects of size on the strength and deformation mechanism in Zr-based metallic glasses. International Journal of Plasticity, 27 (6). pp. 858-867. ISSN 0749-6419. http://resolver.caltech.edu/CaltechAUTHORS:20110627-112106280

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Abstract

We report results of uniaxial compression tests on Zr_(35)Ti_(30)Co_(6)Be_(29) metallic glass nano-pillars with diameters ranging from ~1.6 μm to ~100 nm. The tested pillars have nearly vertical sidewalls, with the tapering angle lower than ~1° (diameter >200 nm) or ~2° (diameter ~100 nm), and with a flat pillar top to minimize the artifacts due to imperfect geometry. We report that highly-localized-to-homogeneous deformation mode change occurs at 100 nm diameter, without any change in the yield strength. We also find that yield strength depends on size only down to 800 nm, below which it remains at its maximum value of 2.6 GPa. Quantitative Weibull analysis suggests that the increase in strength cannot be solely attributed to the lower probability of having weak flaws in small samples – most likely there is an additional influence of the sample size on the plastic deformation mechanism.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1016/j.ijplas.2010.09.010DOIArticle
http://www.sciencedirect.com/science/article/pii/S0749641910001427PublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2010 Elsevier Ltd. Received 14 June 2010; revised 21 September 2010. Available online 30 September 2010. This research is supported by NSF MRSEC (DMR-0520565) and ONR Grant No. 00140910883 at Caltech. The authors gratefully acknowledge Kavli Nanoscience Institute at Caltech for critical support and infrastructure and W.L. Johnson and M.D. Demetriou for providing the bulk sample and for useful discussion.
Group:Kavli Nanoscience Institute
Funders:
Funding AgencyGrant Number
NSFDMR-0520565
Office of Naval Research (ONR)00140910883
Subject Keywords:Mechanical properties testing-compression test; Amorphous materials-metallic glasses; Mechanical properties-brittle-to-ductile transition; Mechanical properties-yield phenomena
Record Number:CaltechAUTHORS:20110627-112106280
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20110627-112106280
Official Citation:Dongchan Jang, Cameron T. Gross, Julia R. Greer, Effects of size on the strength and deformation mechanism in Zr-based metallic glasses, International Journal of Plasticity, Volume 27, Issue 6, June 2011, Pages 858-867, ISSN 0749-6419, DOI: 10.1016/j.ijplas.2010.09.010.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24223
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:27 Jun 2011 20:33
Last Modified:23 Aug 2016 10:02

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