Abstract
The effect of hydrogen on cavity formation in vanadium was investigated using dual ion irradiation at 773,873 and 973 K with hydrogen injection of 0, 15, 30 and 60 appm/dpa doses up to 50 dpa. In some of the samples after dual beam irradiation with H and Ni ions, bimodal cavity size distribution was observed. The injected hydrogen may affect cavity nucleation in a similar manner as helium. There is a critical radius of the cavity under H dual irradiation which depends on the irradiation temperature, like He dual irradiation. The dependence of the critical radius on the amount of injected hydrogen is not clear, but it is suggested that the amount of hydrogen more than a certain value is necessary to promote the nucleation of cavities by injected hydrogen.
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