Structural Characterization of Nickel-Base Alloy C-276 Irradiated with Ar Ions

• Published in: Plasma science & technology Vol. 14; no. 6; pp. 548 - 552
• Main Author: 靳硕学 郭立平 杨铮 周忠坡 付德君 刘传胜 唐睿 刘飞华 乔岩欣
• Format: Journal Article
• Language: English
• Published: 01.06.2012
• Subjects: TEM观察; 原子力显微镜; 掠入射X射线衍射; 离子辐照; 结构表征; 透射电子显微镜; 镍基合金
• ISSN: 1009-0630
• DOI: 10.1088/1009-0630/14/6/26

The irradiation damage in nickel-base alloy C-276 irradiated with 115 keV Ar ions from low to very high doses was investigated. Structural characterization was performed using transmission electron microscopy （TEM）, grazing incident X-ray diffraction （GIXRD） and atomic force microscopy （AFM）. High density of interstitial type dislocation loops could be observed at a dose level of around 2.75 displacements per atom （dpa）. With the irradiation dose increased to 27.5 dpa, the average size of loops increased from 5 nm to 16 nm, while the density of the loops decreased from 1.4 × 1011/cm2 to 4.6 × 1010/cm2. When the irradiation dose reached 82.5 dpa, original grains were transformed into subgrains whose sizes observed from TEM were about 20-60 nm. The fragmentation of grains was confirmed by GIXRD. The mean subgrain size was 40 nm, which was obtained from the full width at half maximum （FWHM） of the X-ray diffraction lines using the Scherrer formula and Williamson formula. AFM micrographs showed that nanometer-sized hillocks formed at the dose of 82.5 dpa, which provided further evidence of grain fragmentation at a high irradiation dose.