Microstructure and defect evolution in oxygen ion-irradiated pure nickel – Insights from experimental probes and molecular dynamics simulations

Saha, U and Dutta, A and Konkati, C and Chakraborty, S and Dey, S and Chauhan, A and Srivastava, S and Gayathri, N and Mukherjee, P (2023) Microstructure and defect evolution in oxygen ion-irradiated pure nickel – Insights from experimental probes and molecular dynamics simulations. In: Materials Chemistry and Physics, 305 .

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Abstract

Pure nickel samples were irradiated to various doses by 160 MeV oxygen ions and the change in microstructure (domain size, microstrain, dislocation density etc.) were investigated with the help of X-ray diffraction (XRD) data from synchrotron source and Transmission electron microscopy (TEM). The coherent domain size decreased, whereas the microstrain and dislocation density increased in all irradiated samples as compared to the unirradiated one. However, these parameters showed saturation with increasing dose. The analysis reveals that there is an increase in the stacking fault probability with irradiation. TEM study confirmed the presence of stacking fault tetrahedra and dislocation loops in the irradiated samples. Microhardness measurements show an increase in the hardness with irradiation due to formation of defect clusters and dislocations. The effect of irradiation on the microstructure of the pure Ni has been simulated by molecular dynamics using overlapping simulation cascades of PKA generated by oxygen ion.

Item Type:	Journal Article
Publication:	Materials Chemistry and Physics
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to the Elsevier Ltd.
Keywords:	Ion irradiation; Microstructural evolution; Molecular dynamics simulation; PKA spectra; Radiation damage; Synchrotron XRD
Department/Centre:	Division of Mechanical Sciences > Materials Engineering (formerly Metallurgy)
Date Deposited:	09 Jul 2023 17:33
Last Modified:	09 Jul 2023 17:33
URI:	https://eprints.iisc.ac.in/id/eprint/82079

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