| Interfacial plasticity governs strain rate sensitivity and ductility in nanostructured metals. | |
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MedLine Citation:
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PMID: 17360604 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Nano-twinned copper exhibits an unusual combination of ultrahigh strength and high ductility, along with increased strain-rate sensitivity. We develop a mechanistic framework for predicting the rate sensitivity and elucidating the origin of ductility in terms of the interactions of dislocations with interfaces. Using atomistic reaction pathway calculations, we show that slip transfer reactions mediated by twin boundary are the rate-controlling mechanisms of plastic flow. We attribute the relatively high ductility of nano-twinned copper to the hardening of twin boundaries as they gradually lose coherency during plastic deformation. These findings provide insights into the possible means of optimizing strength and ductility through interfacial engineering. |
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Authors:
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Ting Zhu; Ju Li; Amit Samanta; Hyoung Gyu Kim; Subra Suresh |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2007-02-21 |
Journal Detail:
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Title: Proceedings of the National Academy of Sciences of the United States of America Volume: 104 ISSN: 0027-8424 ISO Abbreviation: Proc. Natl. Acad. Sci. U.S.A. Publication Date: 2007 Feb |
Date Detail:
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Created Date: 2007-03-15 Completed Date: 2007-06-13 Revised Date: 2009-11-18 |
Medline Journal Info:
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Nlm Unique ID: 7505876 Medline TA: Proc Natl Acad Sci U S A Country: United States |
Other Details:
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Languages: eng Pagination: 3031-6 Citation Subset: IM |
Affiliation:
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Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Copper
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chemistry* Materials Testing Microscopy, Electron, Transmission Models, Chemical* Nanotechnology / methods* |
| Chemical | |
Reg. No./Substance:
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7440-50-8/Copper |
| Comments/Corrections | |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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