Study of radiation damage in ODS steels by positron annihilation spectroscopy

[摘要] Microstructure of various oxide-dispersion-strengthened (ODS) steels with 15% chromium content was studied in term of vacancy defects presence and their accumulation after defined irradiation treatment, respectively. Studied materials originated from Kyoto University and studied via IAEA collaborative project. Samples were characterized "as received" by positron annihilation lifetime spectroscopy and their microstructure was examined by transmission electron microscopy as well. Samples were afterwards irradiated in Washington State University Nuclear Radiation Center via a strong gamma source (6TBq). Damage induced by gamma irradiation was evaluated by positron lifetime measurements in emphasis on defect accumulation in the materials. We have demonstrated strong defect production induced by gamma irradiation which results from positron measurement data.

[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, Paulinska 16, Trnava; 917 24, Slovakia^3;Nuclear Radiation Center, Washington State University, PO Box 641300, Pullman; WA; 99164-1300, United States^4

[关键词] Collaborative projects;Defect accumulation;Irradiation treatment;Nuclear radiations;Oxide dispersion strengthened steel;Positron annihilation lifetime spectroscopy;Positron lifetime measurements;Washington State University