Evaluation of deformation fields associated with irradiation-induced growth and grain boundary interactions in zirconium

IF 3 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY Materialia Pub Date : 2024-12-22 DOI:10.1016/j.mtla.2024.102325
Ronit Roy, Fei Long, Mark R. Daymond
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引用次数: 0

Abstract

Irradiation growth is one of the deformation mechanisms which results in significant dimensional instability in nuclear reactor components over an extended service period. Therefore, understanding irradiation growth is essential for the cost-effective and safe design of nuclear reactors. Irradiation growth results from the preferential diffusion of irradiation-induced point defects, which makes it a macroscopic stress-independent volume-conservative shape change process. Macroscale experiments reveal that irradiation growth exhibits a strong dependence on the grain size of a specimen, i.e., small-sized grains escalate the irradiation growth. However, owing to the limitations in macroscale experiments, the mechanisms associated with such behaviour are not fully understood. The current work aims to investigate the irradiation growth mechanism over macro to micro scales. In order to examine the contributions of grain boundary in irradiation growth, irradiation growth deformation is investigated along different types of grain boundaries using high-resolution electron backscatter diffraction. Next, the results are compared with crystal plasticity-based finite element models to identify the effect of deformation incompatibility induced by the grain boundaries. A simplified yet novel field variable-based technique has been used to mimic the irradiation growth deformation into the finite element model. It is observed that the experimentally measured strains are more significant near the grain boundaries and distributed over a larger area as compared to the finite element results. This difference suggests that the localized strain/stress concentration is not only due to the deformation incompatibility at grain boundaries. The deformation incompatibility also activates additional mechanisms (e.g., irradiation creep), which enhance the deformation processes in the presence of grain boundaries.

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来源期刊
Materialia
Materialia MATERIALS SCIENCE, MULTIDISCIPLINARY-
CiteScore
6.40
自引率
2.90%
发文量
345
审稿时长
36 days
期刊介绍: Materialia is a multidisciplinary journal of materials science and engineering that publishes original peer-reviewed research articles. Articles in Materialia advance the understanding of the relationship between processing, structure, property, and function of materials. Materialia publishes full-length research articles, review articles, and letters (short communications). In addition to receiving direct submissions, Materialia also accepts transfers from Acta Materialia, Inc. partner journals. Materialia offers authors the choice to publish on an open access model (with author fee), or on a subscription model (with no author fee).
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