Abstract
This paper used He2+ ion-irradiated metallic glass Zr64Cu17.8Ni10.7Al7.5 and metallic W with an energy of 500keV at fluences of 2×1017, 5×1017, 1×1018 and 2×1018ions/cm2. Zr-based metallic glass remained mainly amorphous at different fluences. At the irradiation fluence of 2×1018ions/cm2, there was a channel-like damage layer appeared within the range of the surface ions. Cracking and peeling along the grain boundary occurred on the surface of metallic W at the fluence of 1×1018ions/cm2; or even multi-layer peeling occurred at the fluence of 2×1018ions/cm2. TEM analysis revealed that there were a lot of helium bubbles at the end of the range of helium ion. The connection and coalescence growth process of a helium bubble was observed. The surface rms roughness ρrms of Zr-based metallic glass increased first and then decreased with the increase in fluence. The resistance to He2+ irradiation in Zr-based metallic glass was superior to the one in metallic tungsten.
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