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MM: Fachverband Metall- und Materialphysik

MM 37: Transport in Materials: Diffusion, Conduction of Charge or Heat IV

MM 37.4: Vortrag

Mittwoch, 20. März 2024, 12:30–12:45, C 264

Grain- and phase boundary diffusion in AlCoCrFeNi2.1 compositionally complex alloy — •Heng Zhang, Mohan Muralikrishna, Sergiy Divinski, and Gehard Wilde — Institute of Materials Physics, University of Muenster, Wilhelm-Klemm-Str. 10, 48149, Muenster

Grain and phase boundary diffusion of 63Ni is investigated in a Al-Co-Cr-Fe-Ni multi-principal element system. For better understanding on the influence of chemical complexity and the crystal structure on the atomic transport, Ni diffusion is systematically measured in two-phase (FCC+B2) eutectic AlCoCrFeNi2.1 alloy and its single phase FCC and B2 counterparts. Grain boundary (GB) diffusion of Ni is found to be similar in all three alloys substantiating enhanced phase boundary diffusion in the eutectic alloy on par with GB diffusion in single phase alloys. However, when compared on the homologous scale, GB diffusion in FCC and eutectic alloys is found to be similar and it is faster in the single phase B2 HEA. The measured GB diffusivities are compared with the GB self-diffusion rates in pure elements and alloys. An impact of chemical complexity on grain and phase boundary diffusion is discussed in terms of the *sluggish* diffusion concept invented for the high-entropy alloys.

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