Grain boundary softening from stress assisted helium cavity coalescence in ultrafine-grained tungsten
Abstract
The formation of helium cavities in coarse-grained materials produces hardening proportional to the number density and size of the cavities and due to the interaction of dislocations with intragranular helium defects. In nanostructured metals containing a high density of interfacial sinks, preferential cavity formation in the grain boundaries instead produces softening that is often attributed to enhanced interfacial plasticity. Here, employing two grades of ultrafine-grained tungsten, we explore this effect using targeted implantation studies to map cavity evolution as a function of the irradiation conditions and quantify its impact on the mechanical response through nanoindentation. Softening is reported at implantation temperatures above the threshold for preferential grain boundary cavity formation but at a sufficiently low fluence prior to the growth of intragranular cavities. Collective changes in the mean cavity size, density, and morphology beneath a residual impression on an implanted surface indicate that cavity coalescence accompanied the reduction in hardness. Complementary atomistic simulations demonstrate that, in tungsten grain structures exhibiting softening, grain boundary bubble coalescence is driven by stress concentrations that further act to localize strain in the grain boundaries through cooperative deformation processes involving local atomic shuffling and sliding, dislocation emission, and even the nucleation of unstable twinning events.
- Authors:
-
[1];
[1];
[2];
[2];
[1]
- Stony Brook Univ., NY (United States)
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USDOE National Nuclear Security Administration (NNSA); National Science Foundation (NSF)
- OSTI Identifier:
- 1972120
- Alternate Identifier(s):
- OSTI ID: 1971175
- Report Number(s):
- LA-UR-22-32535
Journal ID: ISSN 1359-6454
- Grant/Contract Number:
- 89233218CNA000001; SC0012704; 1810040
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Acta Materialia
- Additional Journal Information:
- Journal Volume: 252; Journal ID: ISSN 1359-6454
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; tungsten; grain boundaries; helium; deformation mechanisms
Citation Formats
Cunningham, W．Streit, Zhang, Yang, Thomas, Spencer L., El-Atwani, Osman, Wang, Yongqiang, and Trelewicz, Jason R. Grain boundary softening from stress assisted helium cavity coalescence in ultrafine-grained tungsten. United States: N. p., 2023.
Web. doi:10.1016/j.actamat.2023.118948.
Cunningham, W．Streit, Zhang, Yang, Thomas, Spencer L., El-Atwani, Osman, Wang, Yongqiang, & Trelewicz, Jason R. Grain boundary softening from stress assisted helium cavity coalescence in ultrafine-grained tungsten. United States. https://doi.org/10.1016/j.actamat.2023.118948
Cunningham, W．Streit, Zhang, Yang, Thomas, Spencer L., El-Atwani, Osman, Wang, Yongqiang, and Trelewicz, Jason R. Thu .
"Grain boundary softening from stress assisted helium cavity coalescence in ultrafine-grained tungsten". United States. https://doi.org/10.1016/j.actamat.2023.118948. https://www.osti.gov/servlets/purl/1972120.
@article{osti_1972120,
title = {Grain boundary softening from stress assisted helium cavity coalescence in ultrafine-grained tungsten},
author = {Cunningham, W．Streit and Zhang, Yang and Thomas, Spencer L. and El-Atwani, Osman and Wang, Yongqiang and Trelewicz, Jason R.},
abstractNote = {The formation of helium cavities in coarse-grained materials produces hardening proportional to the number density and size of the cavities and due to the interaction of dislocations with intragranular helium defects. In nanostructured metals containing a high density of interfacial sinks, preferential cavity formation in the grain boundaries instead produces softening that is often attributed to enhanced interfacial plasticity. Here, employing two grades of ultrafine-grained tungsten, we explore this effect using targeted implantation studies to map cavity evolution as a function of the irradiation conditions and quantify its impact on the mechanical response through nanoindentation. Softening is reported at implantation temperatures above the threshold for preferential grain boundary cavity formation but at a sufficiently low fluence prior to the growth of intragranular cavities. Collective changes in the mean cavity size, density, and morphology beneath a residual impression on an implanted surface indicate that cavity coalescence accompanied the reduction in hardness. Complementary atomistic simulations demonstrate that, in tungsten grain structures exhibiting softening, grain boundary bubble coalescence is driven by stress concentrations that further act to localize strain in the grain boundaries through cooperative deformation processes involving local atomic shuffling and sliding, dislocation emission, and even the nucleation of unstable twinning events.},
doi = {10.1016/j.actamat.2023.118948},
journal = {Acta Materialia},
number = ,
volume = 252,
place = {United States},
year = {Thu Apr 13 00:00:00 EDT 2023},
month = {Thu Apr 13 00:00:00 EDT 2023}
}
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