Dresden 2017 – wissenschaftliches Programm

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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. Divinski11Institute 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 900C. The interdiffusion coefficient at 900C 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.

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