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Journal article
Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology
Nuclear fusion, v 58(1), p16020
09 Nov 2017
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.
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Details
- Title
- Thermal desorption spectroscopy of high fluence irradiated ultrafine and nanocrystalline tungsten: helium trapping and desorption correlated with morphology
- Creators
- Osman El-Atwani - Los Alamos National LaboratoryChase N Taylor - Idaho National LaboratoryJames Frishkoff - Drexel UniversityWayne Harlow - Drexel UniversityErika V Esquivel - Los Alamos National LaboratoryStuart Andrew Maloy - Los Alamos National LaboratoryMitra L Taheri - Drexel UniversityLos Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Details
- Nuclear fusion, v 58(1), p16020
- Publisher
- IOP Science
- Resource Type
- Journal article
- Language
- English
- Web of Science ID
- WOS:000428754900006
- Scopus ID
- 2-s2.0-85038639252
- Other Identifier
- 991019335321204721
InCites Highlights
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- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Physics, Fluids & Plasmas