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Title: Segregation-induced ordered superstructures at general grain boundaries in a nickel-bismuth alloy

Abstract

The properties of materials change, sometimes catastrophically, as alloying elements and impurities accumulate preferentially at grain boundaries. Studies of bicrystals show that regular atomic patterns often arise as a result of this solute segregation at high-symmetry boundaries, but it is not known whether superstructures exist at general grain boundaries in polycrystals. In bismuth-doped polycrystalline nickel, we found that ordered, segregation-induced grain boundary superstructures occur at randomly selected general grain boundaries, and that these reconstructions are driven by the orientation of the terminating grain surfaces rather than by lattice matching between grains. This discovery shows that adsorbate-induced superstructures are not limited to special grain boundaries but may exist at a variety of general grain boundaries, and hence they can affect the performance of polycrystalline engineering alloys.

Authors:
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Publication Date:
Research Org.:
Carnegie Mellon Univ., Pittsburgh, PA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1541684
DOE Contract Number:  
SC0014506
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 358; Journal Issue: 6359; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English
Subject:
Science & Technology - Other Topics

Citation Formats

Yu, Zhiyang, Cantwell, Patrick R., Gao, Qin, Yin, Denise, Zhang, Yuanyao, Zhou, Naixie, Rohrer, Gregory S., Widom, Michael, Luo, Jian, and Harmer, Martin P. Segregation-induced ordered superstructures at general grain boundaries in a nickel-bismuth alloy. United States: N. p., 2017. Web. doi:10.1126/science.aam8256.
Yu, Zhiyang, Cantwell, Patrick R., Gao, Qin, Yin, Denise, Zhang, Yuanyao, Zhou, Naixie, Rohrer, Gregory S., Widom, Michael, Luo, Jian, & Harmer, Martin P. Segregation-induced ordered superstructures at general grain boundaries in a nickel-bismuth alloy. United States. doi:10.1126/science.aam8256.
Yu, Zhiyang, Cantwell, Patrick R., Gao, Qin, Yin, Denise, Zhang, Yuanyao, Zhou, Naixie, Rohrer, Gregory S., Widom, Michael, Luo, Jian, and Harmer, Martin P. Thu . "Segregation-induced ordered superstructures at general grain boundaries in a nickel-bismuth alloy". United States. doi:10.1126/science.aam8256.
@article{osti_1541684,
title = {Segregation-induced ordered superstructures at general grain boundaries in a nickel-bismuth alloy},
author = {Yu, Zhiyang and Cantwell, Patrick R. and Gao, Qin and Yin, Denise and Zhang, Yuanyao and Zhou, Naixie and Rohrer, Gregory S. and Widom, Michael and Luo, Jian and Harmer, Martin P.},
abstractNote = {The properties of materials change, sometimes catastrophically, as alloying elements and impurities accumulate preferentially at grain boundaries. Studies of bicrystals show that regular atomic patterns often arise as a result of this solute segregation at high-symmetry boundaries, but it is not known whether superstructures exist at general grain boundaries in polycrystals. In bismuth-doped polycrystalline nickel, we found that ordered, segregation-induced grain boundary superstructures occur at randomly selected general grain boundaries, and that these reconstructions are driven by the orientation of the terminating grain surfaces rather than by lattice matching between grains. This discovery shows that adsorbate-induced superstructures are not limited to special grain boundaries but may exist at a variety of general grain boundaries, and hence they can affect the performance of polycrystalline engineering alloys.},
doi = {10.1126/science.aam8256},
journal = {Science},
issn = {0036-8075},
number = 6359,
volume = 358,
place = {United States},
year = {2017},
month = {10}
}

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