Regensburg 2016 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 30: Structural Materials I

MM 30.4: Vortrag

Mittwoch, 9. März 2016, 11:00–11:15, H52

Modelling yttrium diffusion in ODS steels — •Markus Mock and Karsten Albe — Technische Universität Darmstadt, Fachbereich Material- und Geowissenschaften, Fachgebiet Materialmodellierung, Jovanka-Bontschits-Str. 2, D-64287 Darmstadt, Germany

Oxide dispersion strengthened (ODS) steels are promising structure materials for future fission and advanced fusion materials. They contain yttrium oxide nanoparticles that enable outstanding high-temperature properties and unique irradiation tolerance. The size, shape and distribution of the particles is of utmost importance for the properties of the material and understanding the precipitation process will allow tailoring the material properties for specific applications. Precipitation of yttrium oxide particles requires diffusion of yttrium through the iron lattice even though there is a high binding energy between substitutional yttrium atoms and vacancies. To investigate the mechanism of yttrium diffusion we created an atomic bond order potential for the iron-yttrium interaction and calculated activation barriers of relevant diffusion events. We present a model for the diffusion mechanism of yttrium through iron that helps understanding the precipitation process in ODS steels.