TEM characterization of dislocation loops in irradiated bcc Fe-based steels

• Published in: Journal of nuclear materials 2013-03, Vol.434 (1-3), p.402-410
• Main Authors: Yao, B., Edwards, D.J., Kurtz, R.J.
• Format: Article
• Language: English
• Subjects: Activation analysis; Anisotropy; Applied sciences; Controled nuclear fusion plants; Density; Dislocation loops; Energy; Energy. Thermal use of fuels; Exact sciences and technology; Fission nuclear power plants; Fuels; Installations for energy generation and conversion: thermal and electrical energy; Irradiation; Martensitic stainless steels; Nuclear fuels; Steels; Transmission electron microscopy
• ISSN: 0022-3115; 1873-4820
• DOI: 10.1016/j.jnucmat.2012.12.002

In this study, we describe a methodology to examine dislocation loops in irradiated steels based on a combination of crystallographic information and g⋅b invisibility criteria. Dislocation loops in transmission electron microscope (TEM) images can be conveniently analyzed using this method. Through this analysis approach, dislocation loops in reduced activation ferritic/martensitic (RAFM) steels irradiated at 400°C have been examined. The predominant types of loops found in irradiated RAFM steels were 〈100〉{200} and 1/2〈111〉{111}. The size, density, and density anisotropy of these two types of dislocation loops were quantified. It was observed that the 〈100〉{200} loop density is more than twice that of 1/2〈111〉{111} loops. A large density anisotropy of 〈100〉{200} loops was identified.