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Effect of temperature on the neutron irradiation-induced cavities in tungsten

Chauhan, A and Yuan, Q and Litvinov, D and Gaganidze, E and Schneider, H-C and Terentyev, D and Aktaa, J (2022) Effect of temperature on the neutron irradiation-induced cavities in tungsten. In: Philosophical Magazine .

Full text not available from this repository.
Official URL: https://doi.org/10.1080/14786435.2022.2079750


To study the effect of temperature on the evolution of irradiation-induced cavities in tungsten, ITER Grade Product tungsten was characterised using transmission electron microscopy (TEM) after neutron irradiation to ∼1 dpa at 600°C, 800°C, and 1000°C. The results showcase irradiation temperature-dependent cavity formation and growth, which is majorly governed by the spatial distribution of transmutation elements in the matrix. Suppression of thermal neutrons fluence by applying stainless steel capsules resulted in a lower density of secondary phases as well as cavities than those reported in the literature for similar irradiation conditions. To further assess temperature effects on the cavity evolution and their stability, dedicated in situ TEM post-irradiation annealing (PIA) experiments were carried out. PIA of 600°C irradiated samples at 600°C for about 1 h revealed no noticeable change on the cavities size distribution. However, upon increasing annealing temperature and time, cavities became coarsened. Vacancy migration and absorption is found to be the dominant mechanism that governs cavity annealing kinetics in the present thin-foil PIA investigations. Furthermore, the cavity coarsening is dictated by the simultaneous evolution of the irradiation-induced dislocation loops, thin-foil free surfaces image forces, and the presence of the transmuted elements and their clusters in the matrix.

Item Type: Journal Article
Publication: Philosophical Magazine
Publisher: Taylor and Francis Ltd.
Additional Information: The copyright for this article belongs to the Taylor and Francis Ltd.
Keywords: Coarsening; Defects; High resolution transmission electron microscopy; Neutron irradiation; Radiation; Size distribution; Temperature; Tungsten, Cavity formation and growth; Effects of temperature; In-situ transmission electron microscopies; Irradiation temperature; Lower density; matrix; Postirradiation annealing; Temperature dependent; Thermal neutron fluences; Thin foil, Annealing
Department/Centre: Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited: 21 Jun 2022 09:41
Last Modified: 21 Jun 2022 09:41
URI: https://eprints.iisc.ac.in/id/eprint/73929

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