Abstract
Ni +-ions with 180 keV energy promote void nucleation, growth and shrinkage as a result of impinging on nickel substrates held at temperatures between 600°C and 750°C. Growth proceeds to fluences near 3 × 10 21 ions/m 2 and is followed by shrinkage and, at 650°C and 700°C, increasing void number densities at higher fluences. Voids formed at 650°C, when ion bombarded at temperatures between 25°C and 550°C, decrease in size and number density, ultimately disappearing after a fluence of ∼ 2 × 10 21 ions/m 2 administered at the lower temperature. These observations are explained using rate theory modified to include the interstitials injected by the ion beam, the changing dislocation density in the irradiation damaged layer, and sputtering of the surface by the ion beam.
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