Abstract
The microstructure of bubbles induced by single-ion (He or H) and sequential-ion H/He irradiation in tungsten were investigated using transmission electron microscopy (TEM). Specimens were irradiated with 12 keV He+ and 6.7 keV H+ under different fluences at 600 °C. Bubbles were observed after single He+ irradiation and sequential H+/He+ irradiation. Compared with single He+ irradiation, the mean size of bubbles decreased first, and then increased with the increasing fluence of pre-implanted H+ for the sequential H+/He+ irradiation condition. The main effect of pre-implanted H+ with low proportion might enhance bubbles nucleated, and the main effect of pre-implanted H+ with high proportion might make bubbles grow larger. The possible mechanism was discussed in this paper.
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