Regensburg 2019 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 25: Transport (Diffusion, conductivity, heat)

MM 25.6: Vortrag

Mittwoch, 3. April 2019, 11:45–12:00, H46

Bulk diffusion of Mn in α-iron — •Vladislav Kulitckii, Sergiy Divinski, and Gerhard Wilde — Institut für Materialphysik, Westfälische Wilhelms-Universität Münster, Münster, Germany

The impact of a magnetic transition on bulk diffusion of Mn in α-iron is studied by microtome (higher temperatures) - and ion-beam sputtering (low temperatures) - sectioning using the radioactive isotope 54Mn. The experiments were performed in the temperature range of 773 to 1173 K. In contrast to the case of self-diffusion [1, 2], a marginal * if any * impact of the magnetic transition in α-Fe on Mn bulk diffusion is observed with almost the same linear Arrhenius dependences below and above the Curie temperature. No distinct deviation from a linear Arrhenius temperature dependence is observed and the Mn bulk diffusion coefficient can be given by the pre-exponential factor D0 = 2.87*10-2 m2/s and the activation enthalpy Q = 282.8* 6.7 kJ/mol in the whole temperature interval under investigation. [1] Y.Iijima, K.Kimura, K.Hirano. Acta Metall. 36 (1988) 2811-2820. [2] M.Lübbehusen, H.Mehrer. Acta Metall. 38 (1990) 283-292