Regensburg 2025 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 35: Transport in Materials: Diffusion, Charge or Heat Conduction

MM 35.5: Vortrag

Freitag, 21. März 2025, 11:15–11:30, H22

Ag bulk and grain boundary diffusion in AlCoCrFeNi2.1 compositionally complex alloy — •Heng Zhang, Mohan Muralikrishna Garlapati, Sergiy V Divinski, and Gerhard Wilde — Institute of Materials Physics, University of Munster, Wilhelm-Klemm-Str. 10

Bulk and grain boundary diffusion of Ag in a eutectic Al-Co-Cr-Fe-Ni multi-principal element system is measured using the radiotracer technique and applying the 110Ag radioisotope. An equilibrium microstructure was produced by rotary forging and annealing of cast and homogenized initial casting ingot material. Ag diffusion is measured in the temperature interval from 673K to 1373K accounting for volume (at high temperatures) and short-circuit (at moderate and low temperatures) diffusion contributions. In the present case, interphase boundaries can potentially contribute in addition to grain boundaries to the short-circuit diffusion. The grain- and interphase-boundary diffusion experiments were performed in the B-type kinetic regime based on Harrison's classification. The results are analyzed with respect to constituent phases (FCC and B2) and different interface types. The contribution of interphase boundary diffusion is analyzed in detail.

Keywords: diffusion; high-entropy alloy; AlCoCrFeNi2.1; eutectic high-entropy alloy