Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology
Abstract
Here, microstructural changes due to displacement damage and helium desorption are two phenomena that occur in tungsten plasma facing materials in fusion reactors. Nanocrystalline metals are being investigated as radiation tolerant materials that can mitigate these microstructural changes and better trap helium along their grain boundaries. Here, we investigate the performance of three tungsten grades (nanocrystalline, ultrafine and ITER grade tungsten), exposed to a high fluence of 4 keV helium at both RT and 773 K, during a thermal desorption spectroscopy (TDS) experiment. An investigation of the microstructure in pre-and post-TDS sample sets was performed. The amount of desorbed helium was shown to be highest in the ITER grade tungsten and lowest in the nanocrystalline tungsten. Correlating the desorption spectra and the microstructure (grain boundaries decorated with nanopores and crack formation) and comparing with previous literature on coarse grained tungsten samples at similar irradiation and TDS conditions, revealed the importance of grain boundaries in trapping helium and limiting helium desorption up to a high temperature of 1350 K in agreement with transmission electron microscopy studies on helium irradiated tungsten which showed preferential and large facetted bubble formation along the grain boundaries in the nanocrystalline tungsten grade.
- Authors:
-
[1];
[1];
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Idaho National Lab. (INL), Idaho Falls, ID (United States)
- Drexel Univ., Philadelphia, PA (United States)
- Publication Date:
- Research Org.:
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1419755
- Report Number(s):
- LA-UR-17-24924
Journal ID: ISSN 0029-5515; TRN: US1801388
- Grant/Contract Number:
- AC52-06NA25396
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 58; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; helium irradiation; tungsten; thermal desorption spectroscopy; microstructuer; grain boundaries
Citation Formats
El-Atwani, Osman, Taylor, Chase N., Frishkoff, James, Harlow, Wayne, Esquivel, Erika V., Maloy, Stuart Andrew, and Taheri, Mitra L. Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology. United States: N. p., 2017.
Web. doi:10.1088/1741-4326/aa86cf.
El-Atwani, Osman, Taylor, Chase N., Frishkoff, James, Harlow, Wayne, Esquivel, Erika V., Maloy, Stuart Andrew, & Taheri, Mitra L. Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology. United States. https://doi.org/10.1088/1741-4326/aa86cf
El-Atwani, Osman, Taylor, Chase N., Frishkoff, James, Harlow, Wayne, Esquivel, Erika V., Maloy, Stuart Andrew, and Taheri, Mitra L. Thu .
"Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology". United States. https://doi.org/10.1088/1741-4326/aa86cf. https://www.osti.gov/servlets/purl/1419755.
@article{osti_1419755,
title = {Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology},
author = {El-Atwani, Osman and Taylor, Chase N. and Frishkoff, James and Harlow, Wayne and Esquivel, Erika V. and Maloy, Stuart Andrew and Taheri, Mitra L.},
abstractNote = {Here, microstructural changes due to displacement damage and helium desorption are two phenomena that occur in tungsten plasma facing materials in fusion reactors. Nanocrystalline metals are being investigated as radiation tolerant materials that can mitigate these microstructural changes and better trap helium along their grain boundaries. Here, we investigate the performance of three tungsten grades (nanocrystalline, ultrafine and ITER grade tungsten), exposed to a high fluence of 4 keV helium at both RT and 773 K, during a thermal desorption spectroscopy (TDS) experiment. An investigation of the microstructure in pre-and post-TDS sample sets was performed. The amount of desorbed helium was shown to be highest in the ITER grade tungsten and lowest in the nanocrystalline tungsten. Correlating the desorption spectra and the microstructure (grain boundaries decorated with nanopores and crack formation) and comparing with previous literature on coarse grained tungsten samples at similar irradiation and TDS conditions, revealed the importance of grain boundaries in trapping helium and limiting helium desorption up to a high temperature of 1350 K in agreement with transmission electron microscopy studies on helium irradiated tungsten which showed preferential and large facetted bubble formation along the grain boundaries in the nanocrystalline tungsten grade.},
doi = {10.1088/1741-4326/aa86cf},
journal = {Nuclear Fusion},
number = 1,
volume = 58,
place = {United States},
year = {2017},
month = {11}
}
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