Irradiation-induced β to α SiC transformation at low temperature

Abstract We observed that β-SiC, neutron irradiated to 9 dpa (displacements per atom) at ≈1440 °C, began transforming to α-SiC, with radiation-induced Frank dislocation loops serving as the apparent nucleation sites. 1440 °C is a far lower temperature than usual β → α phase transformations in SiC. S...

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Autores principales:	Chad M. Parish, Takaaki Koyanagi, Sosuke Kondo, Yutai Katoh
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/55cc40caa9da4c8ebced5a566a7e1d7e
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spelling	oai:doaj.org-article:55cc40caa9da4c8ebced5a566a7e1d7e2021-12-02T16:06:35ZIrradiation-induced β to α SiC transformation at low temperature10.1038/s41598-017-01395-y2045-2322https://doaj.org/article/55cc40caa9da4c8ebced5a566a7e1d7e2017-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-01395-yhttps://doaj.org/toc/2045-2322Abstract We observed that β-SiC, neutron irradiated to 9 dpa (displacements per atom) at ≈1440 °C, began transforming to α-SiC, with radiation-induced Frank dislocation loops serving as the apparent nucleation sites. 1440 °C is a far lower temperature than usual β → α phase transformations in SiC. SiC is considered for applications in advanced nuclear systems, as well as for electronic or spintronic applications requiring ion irradiation processing. β-SiC, preferred for nuclear applications, is metastable and undergoes a phase transformation at high temperatures (typically 2000 °C and above). Nuclear reactor concepts are not expected to reach the very high temperatures for thermal transformation. However, our results indicate incipient β → α phase transformation, in the form of small (~5–10 nm) pockets of α-SiC forming in the β matrix. In service transformation could degrade structural stability and fuel integrity for SiC-based materials operated in this regime. However, engineering this transformation deliberately using ion irradiation could enable new electronic applications.Chad M. ParishTakaaki KoyanagiSosuke KondoYutai KatohNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Chad M. Parish Takaaki Koyanagi Sosuke Kondo Yutai Katoh Irradiation-induced β to α SiC transformation at low temperature
description	Abstract We observed that β-SiC, neutron irradiated to 9 dpa (displacements per atom) at ≈1440 °C, began transforming to α-SiC, with radiation-induced Frank dislocation loops serving as the apparent nucleation sites. 1440 °C is a far lower temperature than usual β → α phase transformations in SiC. SiC is considered for applications in advanced nuclear systems, as well as for electronic or spintronic applications requiring ion irradiation processing. β-SiC, preferred for nuclear applications, is metastable and undergoes a phase transformation at high temperatures (typically 2000 °C and above). Nuclear reactor concepts are not expected to reach the very high temperatures for thermal transformation. However, our results indicate incipient β → α phase transformation, in the form of small (~5–10 nm) pockets of α-SiC forming in the β matrix. In service transformation could degrade structural stability and fuel integrity for SiC-based materials operated in this regime. However, engineering this transformation deliberately using ion irradiation could enable new electronic applications.
format	article
author	Chad M. Parish Takaaki Koyanagi Sosuke Kondo Yutai Katoh
author_facet	Chad M. Parish Takaaki Koyanagi Sosuke Kondo Yutai Katoh
author_sort	Chad M. Parish
title	Irradiation-induced β to α SiC transformation at low temperature
title_short	Irradiation-induced β to α SiC transformation at low temperature
title_full	Irradiation-induced β to α SiC transformation at low temperature
title_fullStr	Irradiation-induced β to α SiC transformation at low temperature
title_full_unstemmed	Irradiation-induced β to α SiC transformation at low temperature
title_sort	irradiation-induced β to α sic transformation at low temperature
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/55cc40caa9da4c8ebced5a566a7e1d7e
work_keys_str_mv	AT chadmparish irradiationinducedbtoasictransformationatlowtemperature AT takaakikoyanagi irradiationinducedbtoasictransformationatlowtemperature AT sosukekondo irradiationinducedbtoasictransformationatlowtemperature AT yutaikatoh irradiationinducedbtoasictransformationatlowtemperature
_version_	1718384961368621056

Irradiation-induced β to α SiC transformation at low temperature

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