Investigation of microstructural changes of ODS steel EP450 after Helium implantation

[摘要] Oxide dispersion strengthened steels (ODS) are good candidates for the first wall of the actual proposed nuclear fusion reactors. This work focuses on the investigation of EP450 ODS by Positron annihilation lifetime spectroscopy (PALS) and Transmission electron microscopy (TEM) in "as received" state and after Helium implantation. Helium implantation produces radiation damage which in many respects is similar to the one related to neutron irradiation. Additionally, the selected area electron diffraction (SAED) together with TEM revealed the nature of Y2O3particles and identified chromium-rich carbides M23C6in the base material. Positron measurements indicate a high concentration of small-scale defects distributed in the sample. TEM was used for identification of microstructural changes after Helium implantation.

[发布机构] Institute of Nuclear and Physical Engineering, Slovak University of Technology in Bratislava, Ilkoviova 3, Bratislava; 812 19, Slovakia^1;Department of Physics, Bowling Green State University, 104 Overman Hall, OH; 43403, United States^2;Department of Materials Science, Faculty of Materials Science and Technology in Trnava, Slovak University of Technology in Bratislava, Paulínska 16, Trnava; 917 24, Slovakia^3

[效力级别] 化学

[关键词] Base material;Helium implantation;Microstructural changes;Nuclear fusion reactors;Oxide dispersion strengthened steel;Positron annihilation lifetime spectroscopy;Selected area electron diffraction;Small scale