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Title: Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation

Abstract

Nanocrystalline metals are often postulated as irradiation tolerant materials due to higher grain boundary densities. The efficiency of these materials in mitigating irradiation damage is still under investigation. Here, we present an in-situ transmission electron microscopy with ion irradiation study on equiaxed 35 nm grained tungsten (NCW-35 nm) and compare its radiation tolerance, in terms of dislocation loop damage, to several other grades of tungsten with different grain sizes at two temperatures (RT and 1073 K). The NCW-35 nm was shown to possess significant higher radiation tolerance in terms of loop damage. As demonstrated by Kinetic Monte Carlo simulations, at least part of the higher radiation tolerance of the small grains is due to higher interstitial storage (at the grain boundaries) and defect recombination (in the grain interiors) in the small grain material. In addition, experimental observations reveal rapid and efficient dislocation loop absorption by the grain boundaries and this is considered the dominant factor for mass transport to the boundaries during irradiation, enabling the remarkable radiation tolerance of 35 nm grained tungsten. Furthermore, this study demonstrates the possibility of attaining high radiation tolerant materials, in terms of dislocation loop damage, by minimizing grain sizes in the nanocrystalline regime.

Authors:
ORCiD logo [1];  [1];  [1]; ORCiD logo [1]; ORCiD logo [1];  [2]; ORCiD logo [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Fusion Energy Sciences (FES); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR)
OSTI Identifier:
1503314
Alternate Identifier(s):
OSTI ID: 1496750; OSTI ID: 1636985
Report Number(s):
LA-UR-18-26832
Journal ID: ISSN 1359-6454; 151393
Grant/Contract Number:  
AC02-06CH11357; 89233218CNA000001; AC07- 051D14517; 20160674PRD3; SC0008875
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 165; Journal Issue: C; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; dislocation loops; grain boundaries; in-situ TEM; nanocrystalline; In-situ TEM

Citation Formats

El-Atwani, Osman, Esquivel, Erika, Aydogan, Eda, Martinez, Enrique, Baldwin, Jon Kevin Scott, Li, Meimei, Uberuaga, Blas P., and Maloy, Stuart Andrew. Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation. United States: N. p., 2018. Web. doi:10.1016/j.actamat.2018.11.024.
El-Atwani, Osman, Esquivel, Erika, Aydogan, Eda, Martinez, Enrique, Baldwin, Jon Kevin Scott, Li, Meimei, Uberuaga, Blas P., & Maloy, Stuart Andrew. Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation. United States. doi:10.1016/j.actamat.2018.11.024.
El-Atwani, Osman, Esquivel, Erika, Aydogan, Eda, Martinez, Enrique, Baldwin, Jon Kevin Scott, Li, Meimei, Uberuaga, Blas P., and Maloy, Stuart Andrew. Thu . "Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation". United States. doi:10.1016/j.actamat.2018.11.024. https://www.osti.gov/servlets/purl/1503314.
@article{osti_1503314,
title = {Unprecedented irradiation resistance of nanocrystalline tungsten with equiaxed nanocrystalline grains to dislocation loop accumulation},
author = {El-Atwani, Osman and Esquivel, Erika and Aydogan, Eda and Martinez, Enrique and Baldwin, Jon Kevin Scott and Li, Meimei and Uberuaga, Blas P. and Maloy, Stuart Andrew},
abstractNote = {Nanocrystalline metals are often postulated as irradiation tolerant materials due to higher grain boundary densities. The efficiency of these materials in mitigating irradiation damage is still under investigation. Here, we present an in-situ transmission electron microscopy with ion irradiation study on equiaxed 35 nm grained tungsten (NCW-35 nm) and compare its radiation tolerance, in terms of dislocation loop damage, to several other grades of tungsten with different grain sizes at two temperatures (RT and 1073 K). The NCW-35 nm was shown to possess significant higher radiation tolerance in terms of loop damage. As demonstrated by Kinetic Monte Carlo simulations, at least part of the higher radiation tolerance of the small grains is due to higher interstitial storage (at the grain boundaries) and defect recombination (in the grain interiors) in the small grain material. In addition, experimental observations reveal rapid and efficient dislocation loop absorption by the grain boundaries and this is considered the dominant factor for mass transport to the boundaries during irradiation, enabling the remarkable radiation tolerance of 35 nm grained tungsten. Furthermore, this study demonstrates the possibility of attaining high radiation tolerant materials, in terms of dislocation loop damage, by minimizing grain sizes in the nanocrystalline regime.},
doi = {10.1016/j.actamat.2018.11.024},
journal = {Acta Materialia},
number = C,
volume = 165,
place = {United States},
year = {2018},
month = {11}
}

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