First-principles calculations of (Y, Ti, O) cluster formation in body centred cubic iron-chromium
2013 (English)In: Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, ISSN 0168-583X, Vol. 303, 18-22 p.Article in journal (Refereed) Published
In the present work, the ab initio parametrization necessary for a Monte Carlo study of the (Y, Ti, O) clusters in a FeCr matrix is done. The cohesive, binding and migration energies of all the solutes have been calculated in the dilute limit in the framework of density functional theory. The special case of the strong interaction between an Y atom and a vacancy has been considered. In the dilute limit, Cr is transparent with respect to Y, Ti, O or vacancies. On the contrary, Y binds O strongly in 2NN configuration while not in 1NN. Ti binds O in 1NN and 2NN configurations. A vacancy binds strongly with Y and O in 1NN position which is resulting in a low diffusion coefficient for Y. The peculiar case of the binding attraction between two interstitial oxygen atoms has been studied and is believed to be the main reason for the planar (2D) symmetry of the cluster nuclei. A preferential cluster shape is determined for the early nucleation stage, up to 12 atoms.
Place, publisher, year, edition, pages
2013. Vol. 303, 18-22 p.
Binding energy, Density functional theory, ODS steels
IdentifiersURN: urn:nbn:se:kth:diva-136055DOI: 10.1016/j.nimb.2013.01.016ISI: 000320151600005ScopusID: 2-s2.0-84884812925OAI: oai:DiVA.org:kth-136055DiVA: diva2:670520
QC 201312032013-12-032013-12-032013-12-03Bibliographically approved