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Title: Heterogeneous solute segregation suppresses strain localization in nanocrystalline Ag-Ni alloys

Abstract

Solute segregation to individual grain boundaries is used by design to produce strong and stable nanocrystalline metallic alloys. Grain-boundary segregation, however, is known to cause adverse embrittlement effects from a strain-localization failure mechanism that imposes significant material limitations for structural applications. Here, using atomistic simulations, it is discovered that heterogeneous Ni segregation in nanocrystalline Ni-mixed Ag alloys dramatically shuts down localized shear bands during plastic deformation, while simultaneously increasing the tensile strength. Nanocrystalline Cu-mixed Ag metals are predicted to exhibit standard homogeneous Cu segregation and a tensile strength that saturates above a solute concentration of 8 at.% due to glass-like shear localization induced by grain boundaries. By contrast, it is found that heterogeneous Ni segregation in nanocrystalline Ag-Ni alloys forms solute-rich clusters along interfaces leading to strain delocalization at high strain and continuous strengthening at high solute concentrations up to 15 at.%. As a result, this study reveals the importance of heterogeneous versus homogeneous segregation behaviors on strain localization and points to a fundamentally new strategy to design failure-resistant nanostructured materials through grain boundary segregation engineering.

Authors:
 [1];  [2]
  1. Guilin University of Electronic Technology, Guangxi Province (China)
  2. University of Vermont, Burlington, VT (United States)
Publication Date:
Research Org.:
Univ. of Vermont, Burlington, VT (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1669363
Alternate Identifier(s):
OSTI ID: 1659368
Grant/Contract Number:  
SC0020054
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 200; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Nanostructured materials; Heterogeneous segregation; Homogeneous segregation; Strain localization; Atomistic simulations

Citation Formats

Pan, Zhiliang, and Sansoz, Frederic. Heterogeneous solute segregation suppresses strain localization in nanocrystalline Ag-Ni alloys. United States: N. p., 2020. Web. https://doi.org/10.1016/j.actamat.2020.08.074.
Pan, Zhiliang, & Sansoz, Frederic. Heterogeneous solute segregation suppresses strain localization in nanocrystalline Ag-Ni alloys. United States. https://doi.org/10.1016/j.actamat.2020.08.074
Pan, Zhiliang, and Sansoz, Frederic. Wed . "Heterogeneous solute segregation suppresses strain localization in nanocrystalline Ag-Ni alloys". United States. https://doi.org/10.1016/j.actamat.2020.08.074. https://www.osti.gov/servlets/purl/1669363.
@article{osti_1669363,
title = {Heterogeneous solute segregation suppresses strain localization in nanocrystalline Ag-Ni alloys},
author = {Pan, Zhiliang and Sansoz, Frederic},
abstractNote = {Solute segregation to individual grain boundaries is used by design to produce strong and stable nanocrystalline metallic alloys. Grain-boundary segregation, however, is known to cause adverse embrittlement effects from a strain-localization failure mechanism that imposes significant material limitations for structural applications. Here, using atomistic simulations, it is discovered that heterogeneous Ni segregation in nanocrystalline Ni-mixed Ag alloys dramatically shuts down localized shear bands during plastic deformation, while simultaneously increasing the tensile strength. Nanocrystalline Cu-mixed Ag metals are predicted to exhibit standard homogeneous Cu segregation and a tensile strength that saturates above a solute concentration of 8 at.% due to glass-like shear localization induced by grain boundaries. By contrast, it is found that heterogeneous Ni segregation in nanocrystalline Ag-Ni alloys forms solute-rich clusters along interfaces leading to strain delocalization at high strain and continuous strengthening at high solute concentrations up to 15 at.%. As a result, this study reveals the importance of heterogeneous versus homogeneous segregation behaviors on strain localization and points to a fundamentally new strategy to design failure-resistant nanostructured materials through grain boundary segregation engineering.},
doi = {10.1016/j.actamat.2020.08.074},
journal = {Acta Materialia},
number = ,
volume = 200,
place = {United States},
year = {2020},
month = {9}
}

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