Study Of Irradiation Damage Induced By Ar¹²⁺ Ion Irradiation In Cu-, Zr-and Co-based Metallic Glasses

Disordered structure of metallic glass was conducive to resist the ion irradiation-induced damage which showed a good radiation resistance and become a research hotspot in recent years. Highly charged ion as a kind of high energetic ion, it has high strength damage in solid material, which can quickly reach irradiation effect. These advantages make it be a powerful mean of irradiation damage simulation Bulk metallic glass (Cu47Zr45Al8)98.5Y1.5, Al7.5Cu17.8Nii0.7Zr64, Co61.2B26.2Si7.8Ta4.8and polycrystalline W were irradiated with3MeV Ar12+to total fluences from1×1014to1×1O16ions/cm2in this paper. XRD, SEM, AFM, ellipsometry and nano-hardness test were used to compare the changes of structure and properties between metallic glass and polycrystalline W to explore the behavior of resistance to Ar12+ion sputtering in the metallic glass materials. The results showed that:Some SRIM simulation results:3MeV Ar12+irradiated Cu-, Zr-and Co-based metallic glass and metal W, respectively, in the range of1.25μm,1.29μm,1.19μ m and0.77μm. The energy loss of metallic glass was less than that of W. The dpa Bragg peaks of metallic glass and metal W were in the vicinity of the range. Sputtering yield of Cu-, Zr-and Co-based metallic glass respectively are0.4874,0.4932and0.6460, while that of the tungsten is0.5678.Under different irradiation fluencies, the three kinds of metallic glasses maintain amorphous as a main structure. For fluences<1×1016ions/cm2, the surface of three kind of metallic glass was essentially featureless and nearly identical to unirradiated sample. When the fluence increased to1×1016ions/cm2, a few blackspots on the surface of Cu-based can be seen. The surface of Co-based metallic glass has uneven irradiation scars and tiny white bumps at the fluence of1×1016ions/cm2. The surface roughness of three kinds of metallic glasses was increased with the fluences. The reflectance of Cu-and Zr-based metallic glasses irradiated with1×1015ions/cm2were decreased by16%and28%. After irradiation, the hardness of Cu-and Zr-based was reduced with the fluences. At Ar12+irradiation fluence of1×1014ions/cm2, craters-like holes as a surface damage pits was found on W. At further higher fluence, this kind of the holes still exist and their size enlarged insignificantly. Meanwhile, the depth of the craters-like pits increase with fluence too. When the fluence increased to1×1016ions/cm2, there are also some knife-like cracking on the W surface and an apparent channel-like holes about dozen microns from the surface of W was appeared. The whole reflectance of W was reduced by about30%at the fluence of. After irradiation, the hardness ofW was increased with the fluences.The anti-radiation performance to Ar12+sputtering of Cu-, Zr-and Co-based metallic glass was superior to the one in polycrystalline tungsten under certain conditions.