Abstract
He2+ ion beam irradiated metallic glass strip Fe80Si7.43B12.57, metallic W and alloy V90.62Cr4.69Ti4.69 with the energy of 500keV were used to compare their characteristics of resistance to irradiation at the fluence of 1×1017, 2×1017, 5×1017 and 1×1018ions/cm2. Metallic glass Fe80Si7.43B12.57 remained amorphous at different fluence of He2+ irradiation without significant surface damage. The root mean square roughness became greater after irradiation and increased slightly with the increase of fluence. Transmission electron microscopy analysis revealed the presence of tiny helium bubbles near the surface and the end of the range of helium ions in the metallic glass. The metallic glass kept good soft magnetic properties. For metallic W at the fluence of 1×1018ions/cm2 larger sunken areas appeared on the surface of some grains and the root mean square roughness increased significantly. Alloy V90.62Cr4.69Ti4.69 blistered and flaked at the fluence of 5×1017ions/cm2 and even multi-layer flaking occurred when the fluence reached 1×1018ions/cm2. The resistance to He2+ ion beam irradiation of metallic glass Fe80Si7.43B12.57 was better than that of metallic W and that of alloy V90.62Cr4.69Ti4.69 was the poorest.
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