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Transition from a strong-yet-brittle to a stronger-and-ductile state by size reduction of metallic glasses

Jang, Dongchan and Greer, Julia R. (2010) Transition from a strong-yet-brittle to a stronger-and-ductile state by size reduction of metallic glasses. Nature Materials, 9 (3). pp. 215-219. ISSN 1476-1122.

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Amorphous metallic alloys, or metallic glasses, are lucrative engineering materials owing to their superior mechanical properties such as high strength and large elastic strain. However, their main drawback is their propensity for highly catastrophic failure through rapid shear banding, significantly undercutting their structural applications. Here, we show that when reduced to 100 nm, Zr-based metallic glass nanopillars attain ceramic-like strengths (2.25 GPa) and metal-like ductility (25%) simultaneously. We report separate and distinct critical sizes for maximum strength and for the brittle-to-ductile transition, thereby demonstrating that strength and ability to carry plasticity are decoupled at the nanoscale. A phenomenological model for size dependence and brittle-to-homogeneous deformation is provided.

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URLURL TypeDescription ReadCube access InNature: Research Highlights InCaltech News InMew Scientist
Jang, Dongchan0000-0002-2814-9734
Greer, Julia R.0000-0002-9675-1508
Additional Information:© 2010 Macmillan Publishers Limited. Published online: 7 February 2010. The authors gratefully acknowledge the financial support of the National Science Foundation through MRSEC (DMR-0520565) at Caltech and of the Office of Naval Research (grant no. N000140910883), as well as Kavli Nanoscience Institute at Caltech and W. L. Johnson and M. D. Demetriou for providing the bulk sample and for useful discussions. Author contributions: D.J. and J.R.G. designed the research and J.R.G. supervised the project. D.J. carried out the experiments. D.J. and J.R.G. contributed to the interpretation of the results and to the writing of the paper.
Group:Kavli Nanoscience Institute
Funding AgencyGrant Number
Office of Naval Research (ONR)N000140910883
Kavli Nanoscience InstituteUNSPECIFIED
Subject Keywords:Glasses | Mechanical properties | Nanoscale materials
Issue or Number:3
Record Number:CaltechAUTHORS:20100305-133845582
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17676
Deposited By: Tony Diaz
Deposited On:12 Mar 2010 18:16
Last Modified:14 Apr 2020 21:43

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