New insights into microstructure of neutron-irradiated tungsten

Abstract The development of appropriate materials for fusion reactors that can sustain high neutron fluence at elevated temperatures remains a great challenge. Tungsten is one of the promising candidate materials for plasma-facing components of future fusion reactors, due to several favorable proper...

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Autores principales:	M. Dürrschnabel, M. Klimenkov, U. Jäntsch, M. Rieth, H. C. Schneider, D. Terentyev
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3ab1988c527a49ed95ca9fdd7048cab5
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spelling	oai:doaj.org-article:3ab1988c527a49ed95ca9fdd7048cab52021-12-02T18:15:24ZNew insights into microstructure of neutron-irradiated tungsten10.1038/s41598-021-86746-62045-2322https://doaj.org/article/3ab1988c527a49ed95ca9fdd7048cab52021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-86746-6https://doaj.org/toc/2045-2322Abstract The development of appropriate materials for fusion reactors that can sustain high neutron fluence at elevated temperatures remains a great challenge. Tungsten is one of the promising candidate materials for plasma-facing components of future fusion reactors, due to several favorable properties as for example a high melting point, a high sputtering resistivity, and a low coefficient of thermal expansion. The microstructural details of a tungsten sample with a 1.25 dpa (displacements per atom) damage dose after neutron irradiation at 800 °C were examined by transmission electron microscopy. Three types of radiation-induced defects were observed, analyzed and characterized: (1) voids with sizes ranging from 10 to 65 nm, (2) dislocation loops with a size of up to 10 nm and (3) W–Re–Os containing σ- and χ-type precipitates. The distribution of voids as well as the nature of the occurring dislocation loops were studied in detail. In addition, nano-chemical analyses revealed that the σ- and χ-type precipitates, which are sometimes attached to voids, are surrounded by a solid solution cloud enriched with Re. For the first time the crystallographic orientation relationship of the σ- and χ-phases to the W-matrix was specified. Furthermore, electron energy-loss spectroscopy could not unambiguously verify the presence of He within individual voids.M. DürrschnabelM. KlimenkovU. JäntschM. RiethH. C. SchneiderD. TerentyevNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-17 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q M. Dürrschnabel M. Klimenkov U. Jäntsch M. Rieth H. C. Schneider D. Terentyev New insights into microstructure of neutron-irradiated tungsten
description	Abstract The development of appropriate materials for fusion reactors that can sustain high neutron fluence at elevated temperatures remains a great challenge. Tungsten is one of the promising candidate materials for plasma-facing components of future fusion reactors, due to several favorable properties as for example a high melting point, a high sputtering resistivity, and a low coefficient of thermal expansion. The microstructural details of a tungsten sample with a 1.25 dpa (displacements per atom) damage dose after neutron irradiation at 800 °C were examined by transmission electron microscopy. Three types of radiation-induced defects were observed, analyzed and characterized: (1) voids with sizes ranging from 10 to 65 nm, (2) dislocation loops with a size of up to 10 nm and (3) W–Re–Os containing σ- and χ-type precipitates. The distribution of voids as well as the nature of the occurring dislocation loops were studied in detail. In addition, nano-chemical analyses revealed that the σ- and χ-type precipitates, which are sometimes attached to voids, are surrounded by a solid solution cloud enriched with Re. For the first time the crystallographic orientation relationship of the σ- and χ-phases to the W-matrix was specified. Furthermore, electron energy-loss spectroscopy could not unambiguously verify the presence of He within individual voids.
format	article
author	M. Dürrschnabel M. Klimenkov U. Jäntsch M. Rieth H. C. Schneider D. Terentyev
author_facet	M. Dürrschnabel M. Klimenkov U. Jäntsch M. Rieth H. C. Schneider D. Terentyev
author_sort	M. Dürrschnabel
title	New insights into microstructure of neutron-irradiated tungsten
title_short	New insights into microstructure of neutron-irradiated tungsten
title_full	New insights into microstructure of neutron-irradiated tungsten
title_fullStr	New insights into microstructure of neutron-irradiated tungsten
title_full_unstemmed	New insights into microstructure of neutron-irradiated tungsten
title_sort	new insights into microstructure of neutron-irradiated tungsten
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/3ab1988c527a49ed95ca9fdd7048cab5
work_keys_str_mv	AT mdurrschnabel newinsightsintomicrostructureofneutronirradiatedtungsten AT mklimenkov newinsightsintomicrostructureofneutronirradiatedtungsten AT ujantsch newinsightsintomicrostructureofneutronirradiatedtungsten AT mrieth newinsightsintomicrostructureofneutronirradiatedtungsten AT hcschneider newinsightsintomicrostructureofneutronirradiatedtungsten AT dterentyev newinsightsintomicrostructureofneutronirradiatedtungsten
_version_	1718378387327680512

New insights into microstructure of neutron-irradiated tungsten

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