Publications Repository - Helmholtz-Zentrum Dresden-Rossendorf

Oxide Dispersion Strengthened (ODS) steel is a promising candidate for an application in fission and fusion power plants of a new generation because of its advantageous properties as stability and temperature resistance. A microscopic understanding of the physical reasons of the mechanical and thermal properties as well as the behaviour of the material under irradiation is an important pre-condition for such applications. The investigated ODS FeCrAl alloy “PM2000” has been produced in a powder metallurgical way by means of hot isostatic pressing and hot rolling. Neutron-induced damage at ODS steel was simulated by He+ and Fe2+ co-implantation with energies of 2.5 MeV and 400 keV, respectively, and different fluences. The implantation has been carried out with a dual ion beam which enables a simultaneous implantation of both ion types. Thereby the Fe2+ implantation was used for the creation of radiation defects, and He+ was implanted in order to reproduce He bubbles as they are expected to appear by neutron irradiation. The implantation-induced damage was investigated by depth dependent Doppler broadening (DB) measurements using a variable energy slow positron beam. In addition, as-received, deformed and annealed ODS samples were characterized by DB and positron lifetime measurements for comparison.