Investigations on irradiation effects of Ni₆₀Nb₄₀ amorphous alloy and Hastelloy-N alloy by 3 MeV au ion

3 MeV Au ions were used to irradiate Hastelloy-N and Ni₆₀Nb₄₀ amorphous alloy, and total doses were 2.3×10¹⁵ cm^-2 and 5×10¹⁶ cm^-2. X-ray Diffraction results presented that Ni₆₀Nb₄₀ amorphous alloy showed good stability in crystal state, but Hastelloy-N had apparent strain increment after irradiation. Nano-Indenter test found that softening of Ni₆₀Nb₄₀ amorphous alloy and hardening of Hastelloy-N were mainly caused by atom displacement damage. Through measuring step heigh created by half-shielding irradiation with an Atomic Force Micoscope, the authors found that the irradiation swelling of both materials were approximate. Scan Electron Micoscope observation showed that the critical dose of Ni₆₀Nb₄₀ amorphous alloy surface viscous flow induced by 3 MeV Au ions was larger than 2.3×10¹⁵ cm^-2. The surface viscous flow critical dose was not uniform, which may be caused by surface stress induced by mechanical polishing. Ni₆₀Nb₄₀ amorphous alloy should be potential to be protective coating against corrosion and irradiation damage, for its self-healing of surface defects through viscous flow mechanism.