Skip to Main content Skip to Navigation
New interface
Journal articles

Dislocation core reconstruction induced by carbon segregation in bcc iron

Abstract : The relative stability of dislocation core configurations in body-centered-cubic metals is profoundly modified by the presence of solutes. Considering the Fe(C) system, we demonstrate by using density functional theory that carbon atoms destabilize the usual easy core to the benefit of the hard core configuration of the screw dislocation, which is unstable in pure metals. The carbon atom is at the center of a regular prism in a cementitelike local environment. The same dislocation core reconstruction is also found with other solutes (B, N, O) and in W(C). This unexpected low-energy configuration induces a strong solute-dislocation attraction, leading to dislocation core saturation by solute atoms, even for very low bulk solute concentrations. This core reconstruction will constitute an essential factor to account for in solute-segregation related phenomena, such as strain aging.
Keywords : number(s): 61 72 Lk 71 15 Mb
Document type :
Journal articles
Complete list of metadata
Contributor : Depot 4 Lyon 1 Connect in order to contact the contributor
Submitted on : Wednesday, February 3, 2021 - 2:27:32 PM
Last modification on : Saturday, September 24, 2022 - 2:30:05 PM


Publisher files allowed on an open archive



Lisa Ventelon, B. L. Uethi, E. Clouet, L. Proville, B. Legrand, et al.. Dislocation core reconstruction induced by carbon segregation in bcc iron. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2015, 91 (22), pp.220102. ⟨10.1103/PhysRevB.91.220102⟩. ⟨hal-02305589⟩



Record views


Files downloads