Microstructure and mechanical properties of hydride blisters formed on Zircaloy-4 claddings
- Authors
- Kim, Ho-A; Kim, Ju-Seong; Lee, Yundong; Kim, Sangbum; Lee, Youho; Kim, Yong-Soo; Kang, Joo-Hee; Kim, Sangtae
- Issue Date
- Jan-2024
- Publisher
- Elsevier B.V.
- Keywords
- Electron backscatter diffraction (EBSD); Fracture toughness; Hydride blister; Micro-cantilever; Zirconium-based claddings
- Citation
- Journal of Nuclear Materials, v.588, pp.1 - 13
- Indexed
- SCOPUS
- Journal Title
- Journal of Nuclear Materials
- Volume
- 588
- Start Page
- 1
- End Page
- 13
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/192176
- DOI
- 10.1016/j.jnucmat.2023.154777
- ISSN
- 0022-3115
- Abstract
- To assess the microstructural and mechanical characteristics of hydride blisters formed on Zircaloy-4 tubes, we employ the electron backscatter diffraction (EBSD) analyses and micro-cantilever failure tests directly on the hydride blister (HB) area. In the HB area, more than 70% of the blister area is characterized to be δ-hydride, and the HB area does not favor the orientation relation ((101¯1)α//(001)δ, [12¯10]α//[1¯10]δ) that is otherwise well-matched in the Zr matrix area. The geometrically necessary dislocation density is observed in the entire blister area, indicating a large amount of strain throughout the blister area. Also, the deformation strain is concentrated in both the hydride and α-Zr phases of HB areas; however, the hydride underwent intensive deformation in the Zr matrix. The average fracture toughness of the hydride blister area obtained through the micro-cantilever test is 1.81 MPam, indicating a brittle fracture that may threaten the integrity of spent nuclear fuel claddings.
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