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MM: Fachverband Metall- und Materialphysik
MM 3: Transport - Atoms and Ions I
MM 3.1: Vortrag
Montag, 16. März 2020, 10:15–10:30, IFW A
Influence of magnetic transformation on bulk diffusion of Mn in iron — •Vladislav Kulitckii1, Omkar Hegde2, Tilmann Hickel2, Chu-Chun Fu3, Sergiy Divinski1, and Gerhard Wilde1 — 1Institutfür Materialphysik, Universität Münster, Germany — 2Max Planck Institute for Iron Research GmbH, Düsseldorf, Germany — 3Atomic Energy and Alternative Energies Commission, Gif-sur-Yvette, France
Comparing to alinear dependencein the paramagnetic state,the Arrhenius plot ofself-diffusion in alpha-iron shows a downward curvature below the Curie temperature.The magnetic transformation-induced kink of diffusion in alpha-iron was also observed for such solutes as Co, Cr, or Ni. Here we are reporting the impact of the magnetic transition on bulk diffusion of Mn. Tracer diffusion was measured by a microtome (higher temperatures) and sputtering (low temperatures) sectioning methods using the radioactive isotope 54Mn. The experiments are performed in a wide temperature range from 773 K to 1173 K.In obvious contrast to self-diffusion, a marginal if any impact of the magnetic transition on Mn bulk diffusion is found. The Mn bulk diffusion coefficient in alpha-Fe follows an Arrhenius dependence with the pre-factor of 0.0287 m2/s and the activation enthalpy of 282.8 kJ/mol. The experimental results are compared with the DFT-based theoretical predictions.