In-situ TEM investigations of dislocation loop annealing kinetics in neutron-irradiated 9Cr RAFM steel

Yuan, Q and Chauhan, A and Gaganidze, E and Aktaa, J (2022) In-situ TEM investigations of dislocation loop annealing kinetics in neutron-irradiated 9Cr RAFM steel. In: Journal of Nuclear Materials, 558 .

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Abstract

Post-irradiation annealing (PIA) is beneficial in recovering degraded mechanical properties of irradiated materials due to the evolution of irradiation-induced defects. To understand the underlying responsible mechanisms, isothermal PIA experiments were carried out in this work on a neutron-irradiated 9Cr reduced-activation ferritic-martensitic steel (EUROFER97) using in-situ transmission electron microscopy. In general, PIA at 600 °C led to an appreciable reduction of the dislocation loop density and increment in the loops mean size. This is found mainly associated with the vacancy-mediated loops shrinkage phenomenon. The driving force for this process is loop's curvature force. Nevertheless, the spontaneous evolution of the loops neighboring microstructure substantially alters their annealing kinetics. Therefore, in this study, loops� annealing kinetics in EUROFER97 is discussed in terms of various scenarios originating in terms of the presence or absence of the local external sources and sinks. In addition, influence of loops type, alloying elements segregation and free surface are also discussed. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Journal of Nuclear Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Alloying elements; Annealing; High resolution transmission electron microscopy; Kinetics; Neutrons; Surface segregation, Annealing experiments; Annealing kinetics; Dislocation loop; In-situ TEM; In-situ transmission electron microscopies; Irradiated materials; Irradiation-induced defects; Neutron irradiated; Postirradiation annealing; Reduced-activation ferritic/martensitic steels, Neutron irradiation
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	22 Nov 2021 11:33
Last Modified:	22 Nov 2021 11:33
URI:	http://eprints.iisc.ac.in/id/eprint/70528

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