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Nanolaminates Utilizing Size-Dependent Homogeneous Plasticity of Metallic Glasses

Kim, Ju-Young and Jang, Dongchan and Greer, Julia R. (2011) Nanolaminates Utilizing Size-Dependent Homogeneous Plasticity of Metallic Glasses. Advanced Functional Materials, 21 (23). pp. 4550-4554. ISSN 1616-301X. http://resolver.caltech.edu/CaltechAUTHORS:20120106-091747290

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Abstract

Homogeneous plasticity in metallic glasses is generally only observed at high temperatures or in very small structures (less than ≈100 nm), so their applications for structural performance have been very limited. Here, nanolaminates with alternating layers of Cu_(50)Zr_(50) metallic glass and nanocrystalline Cu are synthesized and it is found that samples with an optimal composition of 112-nm-thick metallic-glass layers and 16-nm-thick Cu layers demonstrate a maximum strength of 2.513 GPa, a value 33% greater than that predicted by the rule-of-mixtures and 25% better than that of pure Cu_(50)Zr_(50) metallic glass. Furthermore, ≈4% strain at fracture is achieved, suppressing the instantaneous catastrophic failure often associated with metallic glasses. It is postulated that this favorable combination of high strength and deformability is caused by the size-dependent deformation-mode transition in metallic glasses, from highly localized plasticity, leading to immediate failure in larger samples to homogeneous extension in the smaller ones.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1002/adfm.201101164DOIArticle
http://onlinelibrary.wiley.com/doi/10.1002/adfm.201101164/abstractPublisherArticle
ORCID:
AuthorORCID
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2011 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim. Received: May 24, 2011. Published online: September 22, 2011. The authors gratefully acknowledge financial support from the Defense Advanced Research Projects Agency (grant no. N66001-09-1-2092), the National Science Foundation through MRSEC (DMR-0520565) at Caltech 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
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
NSFDMR-0520565
Kavli Nanoscience InstituteUNSPECIFIED
Office of Naval Research (ONR)N66001-09-1-2092
Subject Keywords:nanolaminates; metallic glasses; size-dependent deformation modes
Record Number:CaltechAUTHORS:20120106-091747290
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120106-091747290
Official Citation:Kim, J.-Y., Jang, D. and Greer, J. R. (2011), Nanolaminates Utilizing Size-Dependent Homogeneous Plasticity of Metallic Glasses. Advanced Functional Materials, 21: 4550–4554. doi: 10.1002/adfm.201101164
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:28692
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:06 Jan 2012 17:33
Last Modified:23 Aug 2016 10:08

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