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Vacancies in vanadium

Vanadium alloys are considered as one of the most promising structural materials for the first wall and blanket structures in fusion reactors due to high thermal stress, low induced activation, good creep resistance, and superior mechanical properties at high temperature. Based on first-principles theory, we investigate the microscopic mechanism for He trapping in two kinds of vacancy defects ((a) monovacancy and (b) 9-atom void) inside a vanadium host lattice. Our calculations predict that the monovacancy and 9-atom void result in the strong capability for trapping multiple He atoms.

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Ruihuan Li