Regensburg 2013 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 24: Transport & Diffusion II
MM 24.3: Vortrag
Dienstag, 12. März 2013, 12:15–12:30, H26
Effect of UFG structure on grain boundary diffusion in an Al-Mg-Sc-Zr alloy produced by ECAP — •Anna Mogucheva1,2, Sergiy Divinski2, Rustam Kaibyshev1, and Gerhard Wilde2 — 1Belgorod State University, Pobeda 85, Belgorod, 308015, Russia — 2Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, D-48149 Münster, Germany
An aluminum alloy 5024 (Al-4.6%Mg-0.35%Mn-0.2%Sc-0.09%Zr) was subjected to equal channel angular pressing (ECAP) with the back pressure of 20% ram pressure using rectangularly shaped channels. Processing to the strain of 8 at a temperature of 300oC resulted in the formation of a fully recrystallized structure with a grain size of 1µ m. The kinetic properties of grain boundaries after this treatment were investigated by the radiotracer technique using the 65Zn isotope. The impact of the microstructure on the mechanical properties at elevated temperatures and on the mechanisms of grain boundary diffusion is discussed in detail. A correlation between the superplastic behaviour of the 5024 aluminum alloy and the diffusion properties of the interfaces is also analysed.