Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium

Liu, Si Mian; Zhang, Shi Hao; Abe, Hiroaki; Ogata, Shigenobu; Han, Wei Zhong

doi:https://doi.org/10.1016/j.actamat.2025.121366

Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium

Liu, Si Mian; Zhang, Shi Hao; Abe, Hiroaki et al.

Acta Materialia, 2025, 298, 121366

アクセス数:20件（2025-11-07 12:31 集計）

固定URL: https://hdl.handle.net/11094/102778

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タイトル	Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium
著者	著者名 Liu, Si Mian
	NRID 1000001004895 1000001004895 ORCID 0000-0001-9233-5163 0000-0001-9233-5163 Scopus Author ID 57221298993 57221298993 著者名 Zhang, Shi Hao
	NRID 1000040343925 1000040343925 著者名 Abe, Hiroaki
	NRID 1000020273584 1000020273584 ORCID 0000-0002-9072-4496 0000-0002-9072-4496 researchmap permalink read0185246 read0185246 Scopus Author ID 7201796489 7201796489 著者名 Ogata, Shigenobu
	著者名 Han, Wei Zhong
キーワード等	Annealing
	Dislocation loop
	Hardening
	Irradiation
	Zirconium
内容	Liu S.M., Zhang S.H., Abe H., et al. Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium. Acta Materialia 298, 121366 (2025); https://doi.org/10.1016/j.actamat.2025.121366.
抄録	Annealing is a traditional pathway to mitigate irradiation hardening in metals, while an anomalous annealing hardening is widely observed in neutron-irradiated zirconium (Zr), which is counterintuitive and intriguing, and affects the performance of Zr components in nuclear reactors. Here, we report that the anomalous annealing hardening in irradiated Zr originates from thermally activated formation of three-dimensional kinked 〈c〉 dislocation loops. Through concurrent in-situ heating experiments inside a transmission electron microscope, we demonstrate that irradiation-induced planar 〈c〉 dislocation loops progressively merge into zigzag-shape kinked configurations between 400 °C -500 °C. Atomistic simulations reveal that partial dislocations generated by the dissociation of 1/6 <22‾03> loops glide on pyramidal planes driven by the inter-loop attraction forces, ultimately forming kinked steps. These three-dimensional kinked 〈c〉 loops act as strong obstacles for prismatic 〈a〉 dislocations, leading to a pronounced hardening. This discovery provides a universal framework for understanding the annealing-induced hardening in hexagonal close-packed metals.
出版者	Acta Materialia Inc
収録物名	Acta Materialia
巻(号)	298
ページ	121366
刊行年月	2025-10-01
言語	英語
ハンドルURL	https://hdl.handle.net/11094/102778
PISSN	13596454
関連情報 (isIdenticalTo)	DOI (出版社版) https://doi.org/10.1016/j.actamat.2025.121366
アクセス権	open access
権利情報	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
権利情報	© 2025 The Authors
出版タイプ	Version of Record
カテゴリ	学術雑誌論文 Journal Article

資源タイプ	学術雑誌論文
ローカル資源タイプ	学術雑誌論文
DCMI資源タイプ	text
DCTERMS.bibliographicCitation	Acta Materialia. 2025, 298, p. 121366
DC.title	Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium
DC.creator	Liu, Si Mian
	Zhang, Shi Hao
	Abe, Hiroaki
	Ogata, Shigenobu
	Han, Wei Zhong
DC.publisher	Acta Materialia Inc
DC.language' scheme='DCTERMS.RFC1766	英語
DC.type' scheme='DCTERMS.DCMIType	text
DCTERMS.issued' scheme='DCTERMS.W3CDTF	2025-10-01
DC.identifier	https://doi.org/10.1016/j.actamat.2025.121366
DC.subject	Annealing
	Dislocation loop
	Hardening
	Irradiation
	Zirconium
DC.description	Liu S.M., Zhang S.H., Abe H., et al. Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium. Acta Materialia 298, 121366 (2025); https://doi.org/10.1016/j.actamat.2025.121366.
DCTERMS.abstract	Annealing is a traditional pathway to mitigate irradiation hardening in metals, while an anomalous annealing hardening is widely observed in neutron-irradiated zirconium (Zr), which is counterintuitive and intriguing, and affects the performance of Zr components in nuclear reactors. Here, we report that the anomalous annealing hardening in irradiated Zr originates from thermally activated formation of three-dimensional kinked 〈c〉 dislocation loops. Through concurrent in-situ heating experiments inside a transmission electron microscope, we demonstrate that irradiation-induced planar 〈c〉 dislocation loops progressively merge into zigzag-shape kinked configurations between 400 °C -500 °C. Atomistic simulations reveal that partial dislocations generated by the dissociation of 1/6 <22‾03> loops glide on pyramidal planes driven by the inter-loop attraction forces, ultimately forming kinked steps. These three-dimensional kinked 〈c〉 loops act as strong obstacles for prismatic 〈a〉 dislocations, leading to a pronounced hardening. This discovery provides a universal framework for understanding the annealing-induced hardening in hexagonal close-packed metals.
DC.rights	This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
DC.rights	© 2025 The Authors
DC.format	102778
citation_title	Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium
citation_author	Liu, Si Mian
	Zhang, Shi Hao
	Abe, Hiroaki
	Ogata, Shigenobu
	Han, Wei Zhong
citation_publisher	Acta Materialia Inc
citation_language	英語
citation_date	2025-10-01
citation_journal_title	Acta Materialia
citation_volume	298
citation_firstpage	121366
citation_doi	https://doi.org/10.1016/j.actamat.2025.121366
citation_public_url	https://hdl.handle.net/11094/102778

Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium

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