Resistance To H⁺Induced Irradiation Damage In Metallic Glass Fe₈₀Si_7.43B_12.57 And Ni₆₂Ta₃₈

Metallic glass is characteristic of a short-range ordered and long-range disordered metastable structure, with spatially isotropic physical, chemical and mechanical properties. The inherent disordered structure of metallic glass is conducive to resist ion irradiation-induced damage, so it is likely to become a candidate irradiation-resistant material in radiation environment, such as fusion and aerospace radiation environment. This paper used H+ ion with the energy of 250 keV at fluences of 1×1017,2×1017,5×1017, 1×1018 ions/cm2 and the energy of 40 keV at fluences of 1×1018,3×1018 ions/cm2 for irradiating metallic glass Fe80Si7.43B12.57, Ni62Ta38 and metallic W, in order to study the H+ irradiation-induced changes in the structures and properties of metallic glass and metallic W and probe into the H+ irradiation-resistant behavior of metallic glass.SRIM results show that the ion range of Fe80Si7.43B12.57with the energy of 250 keV is 1.22 μm and the dpa at the fluence of 1×1018 ions/cm2 is 4.87. Fe80Si7.43B12.57 mainly remained amorphous at different fluences, without obvious irradiation-induced damage phenomenon on the surface. Cross-sectional TEM analysis proved that different areas away from the surface were amorphous after irradiation and without significant changes in component distribution along the depth direction. At the energy of 40 keV, the ion range of Fe80Si7.43B12.57 is 0.24 μm and the dpa is 6.22. Fe80Si7.43B12.57 were crystallized after irradiation and the main crystallization phase was cc-Fe, accompanying by a small amount of Fe2B, Fe3B and metastable β-Mn type phase. The connection and coalescence growth process of the hydrogen bubble was observed by high-resolution TEM images. The distribution of the component Fe along the depth direction decreased slightly in the range of crystallization layer. The hysteresis loop of Fe80Si7.43B12.57 changed slightly, but still remained good soft magnetic properties and rms roughness after irradiation increased at different fluences.At the energy of 40 keV, the ion range of Ni62Ta38 is 0.21 μm and the dpa is 4.49. Ni62Ta38 were crystallized after irradiation and crystallization phase were μ-NiTa and Ni3Ta. The rms roughness after irradiation increased and without obvious irradiation-induced damage phenomenon on the surface of Ni62Ta38.At the energy of 250 keV, the ion range of W is 0.93μm and the dpa is 1.74 and at the energy of 40 keV, the ion range of W is 0.15 μm and the dpa is 2.80. The rms roughness after irradiation increased and appeared different degree of blistering damage on the surface of metallic W. The thickness of bubble cap was approximately equal to the ion range at the energy of 250 keV and thebubble cap appeared cracking phenomenon at the energy of 40 keV.Metallic glass Fe80Si7.43B12.57 and Ni62Ta38 appeared different degree of crystallization phenomenon aftercrystallization, but the overall no obvious irradiation-induced damage phenomenon, such asblistering, delamination, etc. appeared. Although SRIM results confirmed that the peak dpa of Fe80Si7.43B12.57 and Ni62Ta38 were greater than that of metallic W, but the damage on the surface of metallic W was more severe, indicating that the disordered structure of metallic glass could accommodate more H+ and irradiation-induced defects. The H+ irradiation-resistant properties of metallic glass Fe80Si7.43B12.57 and Ni62Ta38 were superior to those of metallic W, thereinto, the H+ irradiation resistance property of metallic glass Ni62Ta38 was better than that of Fe80Si7.43B12.57.