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Title: Influence of grain boundary characteristics on thermal stability in nanotwinned copper

Abstract

High density grain boundaries provide high strength, but may introduce undesirable features, such as high Fermi levels and instability. We investigated the kinetics of recovery and recrystallization of Cu that was manufactured to include both nanotwins (NT) and high-angle columnar boundaries. We used the isothermal Johnson-Mehl-Avrami-Kolmogorov (JMAK) model to estimate activation energy values for recovery and recrystallization and compared those to values derived using the non-isothermal Kissinger equation. The JMAK model hinges on an exponent that expresses the growth mechanism of a material. The exponent for this Cu was close to 0.5, indicating low-dimensional microstructure evolution, which is associated with anisotropic twin coarsening, heterogeneous recrystallization, and high stability. Since this Cu was of high purity, there was a negligible impurity-drag-effect on boundaries. The twin coarsening and heterogeneous recrystallization resulted from migration of high-angle columnar boundaries with their triple junctions in one direction, assisted by the presence of high concentration vacancies at boundaries. Analyses performed by electron energy loss spectroscopy of atomic columns at twin boundaries (TBs) and in the interior showed similar plasma peak shapes and L3 edge positions. As a result, this implies that values for conductivity and Fermi level are equal for atoms at TBs and in themore » interior.« less

Authors:
 [1];  [1];  [1];  [1];  [1];  [2]
  1. Florida State Univ., Tallahassee, FL (United States)
  2. Northeastern Univ., Shenyang (China)
Publication Date:
Research Org.:
Florida State Univ., Tallahassee, FL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1326644
Grant/Contract Number:
SC0008832
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 6; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Niu, Rongmei, Han, Ke, Su, Yi-feng, Besara, Tiglet, Siegrist, Theo M., and Zuo, Xiaowei. Influence of grain boundary characteristics on thermal stability in nanotwinned copper. United States: N. p., 2016. Web. doi:10.1038/srep31410.
Niu, Rongmei, Han, Ke, Su, Yi-feng, Besara, Tiglet, Siegrist, Theo M., & Zuo, Xiaowei. Influence of grain boundary characteristics on thermal stability in nanotwinned copper. United States. doi:10.1038/srep31410.
Niu, Rongmei, Han, Ke, Su, Yi-feng, Besara, Tiglet, Siegrist, Theo M., and Zuo, Xiaowei. 2016. "Influence of grain boundary characteristics on thermal stability in nanotwinned copper". United States. doi:10.1038/srep31410. https://www.osti.gov/servlets/purl/1326644.
@article{osti_1326644,
title = {Influence of grain boundary characteristics on thermal stability in nanotwinned copper},
author = {Niu, Rongmei and Han, Ke and Su, Yi-feng and Besara, Tiglet and Siegrist, Theo M. and Zuo, Xiaowei},
abstractNote = {High density grain boundaries provide high strength, but may introduce undesirable features, such as high Fermi levels and instability. We investigated the kinetics of recovery and recrystallization of Cu that was manufactured to include both nanotwins (NT) and high-angle columnar boundaries. We used the isothermal Johnson-Mehl-Avrami-Kolmogorov (JMAK) model to estimate activation energy values for recovery and recrystallization and compared those to values derived using the non-isothermal Kissinger equation. The JMAK model hinges on an exponent that expresses the growth mechanism of a material. The exponent for this Cu was close to 0.5, indicating low-dimensional microstructure evolution, which is associated with anisotropic twin coarsening, heterogeneous recrystallization, and high stability. Since this Cu was of high purity, there was a negligible impurity-drag-effect on boundaries. The twin coarsening and heterogeneous recrystallization resulted from migration of high-angle columnar boundaries with their triple junctions in one direction, assisted by the presence of high concentration vacancies at boundaries. Analyses performed by electron energy loss spectroscopy of atomic columns at twin boundaries (TBs) and in the interior showed similar plasma peak shapes and L3 edge positions. As a result, this implies that values for conductivity and Fermi level are equal for atoms at TBs and in the interior.},
doi = {10.1038/srep31410},
journal = {Scientific Reports},
number = ,
volume = 6,
place = {United States},
year = 2016,
month = 8
}

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