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MM: Fachverband Metall- und Materialphysik

MM 24: Topical session (Symposium EPS and MM, joint session with MA): Magnetism in Materials Science: Thermodynamics, Kinetics and Defects (joint session MM/MA)

MM 24.4: Talk

Tuesday, March 13, 2018, 12:45–13:00, H 0106

Effect of magnetic transition on grain boundary diffusion of Mn in α-iron — Vladislav Kulitckii, Sergiy Divinski, and •Gerhard Wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany

Grain boundary diffusion of Mn in α-Fe has been studied in both, B- and C-types kinetic regimes in a wide temperature range of 473 to 1173 K. The concentration profiles were measured applying the radiotracer technique with serial sectioning by microtome and using the 54Mn radioactive isotope. As a result, Mn segregation at general high-angle grain boundaries of *-Fe is estimated. The grain boundary diffusivities were found to exhibit a distinct non-linear Arrhenius temperature dependence that in discussed in terms of the impact of the magnetic transition on Mn grain boundary diffusion.