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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 20: Structurally and Chemically Complex Alloys (joint session MM/KFM)

KFM 20.1: Talk

Wednesday, March 20, 2024, 17:15–17:30, C 230

Synthesis and atomic transport properties in pseudo-binary ordered B2 aluminides — •Mohan Muralikrishna Garlapati¹, Christian H. Liebscher², Murty B.S.³, Gerhard Wilde¹, and Sergiy V. Divinski¹ — ¹Institute of Materials Physics, University of Muenster, 48149-Muenster, Germany — ²Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany — ³Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, 600036-Chennai, India.

The present study highlights a novel alloy design of HEAs to fabricate fully ordered pseudo-binary multicomponent and ordered aluminides and is focused on the underlying diffusion behaviour. Microstructure and sublattice ordering in the multicomponent alloys starting from binary to hexanary B2 aluminides are studied. A radiotracer technique using the 57Co, 59Fe, 54Mn, 63Ni and 65Zn radioisotopes is employed to measure the diffusion rates of individual elements. Diffusion in the multicomponent (n>4) B2 ordered alloys is found to be enhanced in comparison to stoichiometric binary AlNi. However, the addition of Co or Fe to AlNi slows down (Co) or enhances (Fe) the diffusion rates. The measured diffusivities are compared to the literature data and the effect of chemical complexity and the B2 ordering on diffusion are discussed.

Keywords: B2 Aluminide; Diffusion; High entropy alloys; Pseudo-binary; Alloy design