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

Number of Access:20（2025-11-07 13:01 Counts）

Identifier to cite or link to this item: https://hdl.handle.net/11094/102778

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Title
Kinked basal dislocation loops for anomalous annealing hardening in irradiated zirconium
Creator
CreatorName
Liu, Si Mian
NRID
1000001004895 1000001004895
ORCID
0000-0001-9233-5163 0000-0001-9233-5163
Scopus Author ID
57221298993 57221298993
CreatorName
Zhang, Shi Hao
NRID
1000040343925 1000040343925
CreatorName
Abe, Hiroaki
NRID
1000020273584 1000020273584
ORCID
0000-0002-9072-4496 0000-0002-9072-4496
researchmap permalink
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Scopus Author ID
7201796489 7201796489
CreatorName
Ogata, Shigenobu
CreatorName
Han, Wei Zhong
Subject
Annealing
Dislocation loop
Hardening
Irradiation
Zirconium
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.
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.
Publisher
Acta Materialia Inc
Source Title
Acta Materialia
Volume (Issue)
298
Page
121366
Date of Issued
2025-10-01
Language
English
Handle URL
https://hdl.handle.net/11094/102778
PISSN
13596454
Relation.isIdenticalTo
DOI (Publisher Version)
https://doi.org/10.1016/j.actamat.2025.121366
Access Rights
open access
CopyRight
This article is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.
© 2025 The Authors
oaire:version
Version of Record
Category
学術雑誌論文 Journal Article