Helium-induced defect clustering and thermal evolution in V-4Cr-4Ti: an alloy for fusion reactor applications.

ABSTRACT: The V-4Cr-4Ti alloy is a promising candidate for the first-wall and blanket structural materials in future fusion reactors. In this study, a V-4Cr-4Ti alloy sample was irradiated at room temperature with 130 keV He⁺ ions to a dose of 1 × 10¹⁷ ions/cm² and depth-resolved defect studies under isochronal annealing were conducted using variable low-energy positron beam-based Doppler broadening spectroscopy. Density functional theory calculations were used to identify the energetically favourable configurations of helium-vacancy (He_mV_n) clusters in vanadium. Helium was found to prefer tetrahedral interstitial sites in the absence of vacancies, and octahedral sites when vacancies are present. Positron annihilation parameters were computed for these defect configu

SUBMITTER: Ramachandran R 

PROVIDER: S-EPMC12603076 | biostudies-literature | 2025 Nov

REPOSITORIES: biostudies-literature