3 MeV 金离子辐照Ni60Nb40 非晶合金及Hastelloy-N 合金的辐照损伤研究
Investigations on Irradiation Effects of Ni60Nb40 Amorphous Alloy and Hastelloy-N Alloy by 3 MeV Au Ion

摘要 使用 3 MeV 金离子对Ni60Nb40 非晶合金和Hastelloy-N 合金进行剂量为2.3×1015 cm–2 和5×1016 cm–2 的辐照实验。X 射线衍射(XRD)数据表明, Ni60Nb40 非晶合金的非晶态在室温辐照下非常稳定, 而Hastelloy- N 合金在辐照后有明显的微观应变增加。同时纳米压痕分析表明, Ni60Nb40 非晶合金的辐照软化和Hastelloy- N 合金的辐照硬化主要由原子移位损伤造成。使用原子力显微镜(AFM)测量半遮挡的辐照方法制造的肿胀台阶, 发现两种材料的辐照肿胀效应相差不大。扫描电子显微镜(SEM)观察发现, 室温条件下3 MeV 金离子导致Ni60Nb40 非晶合金表面发生黏性流动的临界剂量大于2.3×1015 cm–2, 而且发生线性流动的临界剂量具有不均匀性, 推测是由机械抛光时产生的表面应力造成。由于黏性流动可以有效修补表面缺陷, 所以Ni60Nb40 非晶合金有希望作为抗腐蚀抗辐照涂层材料。
Abstract 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.