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Title: Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten

Abstract

The unique ability of grain boundaries to act as effective sinks for radiation damage plays a significant role in nanocrystalline materials due to their large interfacial area per unit volume. Leveraging this mechanism in the design of tungsten as a plasma-facing material provides a potential pathway for enhancing its radiation tolerance under fusion-relevant conditions. In this study, we explore the impact of defect microstructures on the mechanical behavior of helium ion implanted nanocrystalline tungsten through nanoindentation. Softening was apparent across all implantation temperatures and attributed to bubble/cavity loaded grain boundaries suppressing the activation barrier for the onset of plasticity via grain boundary mediated dislocation nucleation. An increase in fluence placed cavity induced grain boundary softening in competition with hardening from intragranular defect loop damage, thus signaling a new transition in the mechanical behavior of helium implanted nanocrystalline tungsten.

Authors:
 [1];  [1];  [2]; ORCiD logo [3];  [4];  [2]; ORCiD logo [1]
  1. Stony Brook Univ., NY (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Idaho National Lab. (INL), Idaho Falls, ID (United States)
  4. Middle East Technical Univ., Ankara (Turkey)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1423975
Report Number(s):
LA-UR-17-26895
Journal ID: ISSN 2045-2322
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Scientific Reports
Additional Journal Information:
Journal Volume: 8; Journal Issue: 1; Journal ID: ISSN 2045-2322
Publisher:
Nature Publishing Group
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Cunningham, W. Streit, Gentile, Jonathan M., El-Atwani, Osman, Taylor, Chase N., Efe, Mert, Maloy, Stuart A., and Trelewicz, Jason R. Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten. United States: N. p., 2018. Web. doi:10.1038/s41598-018-20990-1.
Cunningham, W. Streit, Gentile, Jonathan M., El-Atwani, Osman, Taylor, Chase N., Efe, Mert, Maloy, Stuart A., & Trelewicz, Jason R. Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten. United States. doi:10.1038/s41598-018-20990-1.
Cunningham, W. Streit, Gentile, Jonathan M., El-Atwani, Osman, Taylor, Chase N., Efe, Mert, Maloy, Stuart A., and Trelewicz, Jason R. Tue . "Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten". United States. doi:10.1038/s41598-018-20990-1. https://www.osti.gov/servlets/purl/1423975.
@article{osti_1423975,
title = {Softening due to Grain Boundary Cavity Formation and its Competition with Hardening in Helium Implanted Nanocrystalline Tungsten},
author = {Cunningham, W. Streit and Gentile, Jonathan M. and El-Atwani, Osman and Taylor, Chase N. and Efe, Mert and Maloy, Stuart A. and Trelewicz, Jason R.},
abstractNote = {The unique ability of grain boundaries to act as effective sinks for radiation damage plays a significant role in nanocrystalline materials due to their large interfacial area per unit volume. Leveraging this mechanism in the design of tungsten as a plasma-facing material provides a potential pathway for enhancing its radiation tolerance under fusion-relevant conditions. In this study, we explore the impact of defect microstructures on the mechanical behavior of helium ion implanted nanocrystalline tungsten through nanoindentation. Softening was apparent across all implantation temperatures and attributed to bubble/cavity loaded grain boundaries suppressing the activation barrier for the onset of plasticity via grain boundary mediated dislocation nucleation. An increase in fluence placed cavity induced grain boundary softening in competition with hardening from intragranular defect loop damage, thus signaling a new transition in the mechanical behavior of helium implanted nanocrystalline tungsten.},
doi = {10.1038/s41598-018-20990-1},
journal = {Scientific Reports},
number = 1,
volume = 8,
place = {United States},
year = {Tue Feb 13 00:00:00 EST 2018},
month = {Tue Feb 13 00:00:00 EST 2018}
}

Journal Article:
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