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

El-Atwani, Osman; Esquivel, Erika V.; Aydogan, Eda; Martinez, Enrique; Baldwin, Jon Kevin Scott; Li, Meimei; Uberuaga, Blas P.; Maloy, Stuart Andrew

doi:10.1016/j.actamat.2018.11.024

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

Journal Article · Thu Nov 15 00:00:00 EST 2018 · Acta Materialia

DOI:https://doi.org/10.1016/j.actamat.2018.11.024· OSTI ID:1496750

^[1]; Esquivel, Erika V. ^[1]; Aydogan, Eda ^[1]; ^[1]; ^[1]; Li, Meimei ^[2]; ^[1]; ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)

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.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Office of Nuclear Energy (NE); USDOE Office of Science (SC), Advanced Scientific Computing Research (ASCR); USDOE Office of Science (SC), Fusion Energy Sciences (FES)

Grant/Contract Number:: 89233218CNA000001; AC02-06CH11357; SC0008875

OSTI ID:: 1496750

Alternate ID(s):: OSTI ID: 1503314
OSTI ID: 1636985

Report Number(s):: LA-UR--18-26832

Journal Information:: Acta Materialia, Journal Name: Acta Materialia Journal Issue: C Vol. 165; ISSN 1359-6454

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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

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