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MM: Fachverband Metall- und Materialphysik
MM 52: Microstructure and Phase Transformations - phase stability
MM 52.3: Vortrag
Mittwoch, 22. März 2017, 17:30–17:45, IFW B
Linear complexions - local phase transformation of dislocations — Alisson Kwiatkowski da Silva1, Margarita Kuzmina1, Dirk Ponge1, Michael Herbig1, •Stefanie Sandlöbes1,2, Baptiste Gault1, Sandra Korte-Kerzel2, and Dierk Raabe1 — 1Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany — 2Institut für Metallkunde und Metallphysik, RWTH Aachen University, Aachen, Germany
Complexions are confined interface-stabilized states which differ in structure and/or composition from the bulk. They form in many ceramic materials as 2D complexions. We use correlative transmission electron microscopy / atom probe tomography to show the existence of 1D complexions in a martensitic Fe9wt%Mn alloy. Equilibrium segregation of Mn to dislocations causes transformation of dislocation cores into austenite. These austenite regions are found to be confined to the strain field of the dislocation and remain sub-critical in size even after extended tempering treatment for two weeks. This observation might give new insights into microstructure formation and deformation of metallic alloys.