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Title: Nanodomained Nickel Unite Nanocrystal Strength with Coarse-Grain Ductility

Abstract

Conventional metals are routinely hardened by grain refinement or by cold working with the expense of their ductility. Recent nanostructuring strategies have attempted to evade this strength versus ductility trade-off, but the paradox persists. It has never been possible to combine the strength reachable in nanocrystalline metals with the large uniform tensile elongation characteristic of coarse-grained metals. Here a defect engineering strategy on the nanoscale is architected to approach this ultimate combination. For Nickel, spread-out nanoscale domains (average 7 nm in diameter) were produced during electrodeposition, occupying only ~2.4% of the total volume. Yet the resulting Ni achieves a yield strength approaching 1.3 GPa, on par with the strength for nanocrystalline Ni with uniform grains. Simultaneously, the material exhibits a uniform elongation as large as ~30%, at the same level of ductile face-centered-cubic metals. Electron microscopy observations and molecular dynamics simulations demonstrate that the nanoscale domains effectively block dislocations, akin to the role of precipitates for Orowan hardening. In the meantime, the abundant domain boundaries provide dislocation sources and trapping sites of running dislocations for dislocation multiplication and the ample space in the grain interior allows dislocation storage; a pronounced strain-hardening rate is therefore sustained to enable large uniform elongation.

Authors:
 [1];  [1];  [1];  [1];  [1];  [1];  [1];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Johns Hopkins Univ., Baltimore, MD (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; Natural Science Foundation of China; National 973 Program
OSTI Identifier:
1624777
Grant/Contract Number:  
FG02-03ER46056; 11072243; 11222224; 11472286; 50571110; 2012CB932203; 2012CB937500; 6138504
Resource Type:
Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 5; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; science & technology; mechanical properties; metals and alloys

Citation Formats

Wu, Xiaolei, Yuan, Fuping, Yang, Muxin, Jiang, Ping, Zhang, Chuanxin, Chen, Liu, Wei, Yueguang, and Ma, Evan. Nanodomained Nickel Unite Nanocrystal Strength with Coarse-Grain Ductility. United States: N. p., 2015. Web. doi:10.1038/srep11728.
Wu, Xiaolei, Yuan, Fuping, Yang, Muxin, Jiang, Ping, Zhang, Chuanxin, Chen, Liu, Wei, Yueguang, & Ma, Evan. Nanodomained Nickel Unite Nanocrystal Strength with Coarse-Grain Ductility. United States. https://doi.org/10.1038/srep11728
Wu, Xiaolei, Yuan, Fuping, Yang, Muxin, Jiang, Ping, Zhang, Chuanxin, Chen, Liu, Wei, Yueguang, and Ma, Evan. Tue . "Nanodomained Nickel Unite Nanocrystal Strength with Coarse-Grain Ductility". United States. https://doi.org/10.1038/srep11728. https://www.osti.gov/servlets/purl/1624777.
@article{osti_1624777,
title = {Nanodomained Nickel Unite Nanocrystal Strength with Coarse-Grain Ductility},
author = {Wu, Xiaolei and Yuan, Fuping and Yang, Muxin and Jiang, Ping and Zhang, Chuanxin and Chen, Liu and Wei, Yueguang and Ma, Evan},
abstractNote = {Conventional metals are routinely hardened by grain refinement or by cold working with the expense of their ductility. Recent nanostructuring strategies have attempted to evade this strength versus ductility trade-off, but the paradox persists. It has never been possible to combine the strength reachable in nanocrystalline metals with the large uniform tensile elongation characteristic of coarse-grained metals. Here a defect engineering strategy on the nanoscale is architected to approach this ultimate combination. For Nickel, spread-out nanoscale domains (average 7 nm in diameter) were produced during electrodeposition, occupying only ~2.4% of the total volume. Yet the resulting Ni achieves a yield strength approaching 1.3 GPa, on par with the strength for nanocrystalline Ni with uniform grains. Simultaneously, the material exhibits a uniform elongation as large as ~30%, at the same level of ductile face-centered-cubic metals. Electron microscopy observations and molecular dynamics simulations demonstrate that the nanoscale domains effectively block dislocations, akin to the role of precipitates for Orowan hardening. In the meantime, the abundant domain boundaries provide dislocation sources and trapping sites of running dislocations for dislocation multiplication and the ample space in the grain interior allows dislocation storage; a pronounced strain-hardening rate is therefore sustained to enable large uniform elongation.},
doi = {10.1038/srep11728},
journal = {Scientific Reports},
number = 1,
volume = 5,
place = {United States},
year = {Tue Jun 30 00:00:00 EDT 2015},
month = {Tue Jun 30 00:00:00 EDT 2015}
}

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