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MM: Fachverband Metall- und Materialphysik
MM 28: Transport I - atomic transport
MM 28.3: Vortrag
Dienstag, 21. März 2017, 10:45–11:00, IFW D
Chemical and tracer diffusion in the Fe-Ga binary couple — •Bengü Tas-Kavakbasi1, Aloke Paul2, Igor Stanislavovich Golovin3, Gerhard Wilde1, and Sergiy V. Divinski1 — 1Institute of Materials Physics, University of Münster, Germany — 2Department of Materials Engineering, Indian Institute of Science, Bangalore, India — 3National University of Science and Technology “MISiS”, Moscow, Russia
In the present study, Manning‘s “sandwich interdiffusion” approach is applied to the Fe-Ga binary system and the interdiffusion measurements are directly combined with a tracer diffusion experiment. The 55Fe radioisotope is deposited on the outer surfaces of a Fe-8Ga/Fe-24Ga interdiffusion couple (the concentrations are given in at.%) and on the initial interface between the two alloys. The couple was subsequently annealed at 900∘C. The interdiffusion coefficient at 900∘C is determined using electron probe profiling and the standard Sauer-Freise analysis. A strong composition dependence of the interdiffusion coefficient was found and its dependence on the molar volume is evaluated. The composition dependence of the 55Fe tracer diffusion coefficient in the Fe-8Ga/Fe-24Ga interdiffusion couple has been determined, too.