Abstract
Surface modification of tungsten vanadium (W–V) alloy under high heat flux helium particle bombardment has been studied. W–5 wt.% V samples were irradiated by repeated helium pulses at a peak surface temperature of 900 °C and 1800 °C, respectively, in the neutral beam facility GLADIS. The effect of helium fluence on the surface morphology changes was investigated by increasing the helium fluence from 1 × 1022 m−2– 2 × 1022 m−2. Blistering is the typical structure after the repeated helium pulses loading at 900 °C, and it becomes more severe with increased fluence. A porous structure becomes dominant at 1800 °C. An evolution of a porous structure to coral-like structure is observed as fluence increases. In addition, the three typical regions in the W–5V, W-enriched region, W–V solid solute region, and V-enriched region, exhibit different damage features. The W–V solid solute region shows better surface damage resistance compared to the other two regions.
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