|About this Abstract
||Materials Science & Technology 2019
||Materials for Nuclear Applications
||In-situ Ion Irradiation Study of Silicon Carbide-Carbon Coated Nanostructured Ferritic Alloy
||Kathy Lu, Kaustubh Bawane
|On-Site Speaker (Planned)
In this study, a composite based on silicon carbide and carbon coated nanostructured ferritic alloy (SiC-C@NFA) was irradiated with Kr++ ions at 1 MeV energy up to 10 dpa at 300°C and 450°C. Microstructures and defect evolution were studied in-situ using the IVEM facility at Argonne National Laboratory. SRIM simulations were carried out to theoretically estimate the dpa damage. The effect of ion irradiation on various phases such as α-ferrite (NFA) matrix, (Fe,Cr)7C3, and (Ti,W)C precipitates was evaluated. The α-ferrite matrix showed continuous increase in dislocation density along with spatial ordering (or loop string) of dislocations at >5 dpa irradiation. The size of the dislocation loops at 450°C was higher than that at 300°C. The nucleation and growth of new (Ti,W)C precipitates in α-ferrite grains increase with the ion dose at 450°C. This study provides in-depth understanding of the ion irradiation resistance of the SiC-C@NFA system.