Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Topical session (Symposium MM): High entropy and compositionally complex alloys
MM 14.8: Vortrag
Dienstag, 2. April 2019, 12:45–13:00, H43
Solute diffusion in HCP high entropy alloys — •Sandipan Sen1, Mayur Vaidya1, Lukasz Rogal2, Blazej Grabowski3, Sankaran Shanmugam1,4, Gerhard Wilde1, and Sergiy Divinski1 — 1Institute of Materials Physics, University of Münster, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 30-059 Krakow, Poland — 3Max-Planck-Institut für Eisenforschung GmbH D-40237 Düsseldorf, Germany — 4Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai-600036, India
Diffusion studies in high entropy alloys are still scarce and practically limited to FCC systems. For the first time, diffusion in HCP high entropy alloys is investigated using a radiotracer technique. Diffusion of Co (the so-called ultra-fast diffuser in α-Ti) is systematically measured in HfZr, HfZrTi, and Al-Hf-Sc-Ti-Zr alloys in the temperature range between 400°C - 800°C and, thus, the impact of the number of constituting elements on solute diffusion is examined. Two quinary systems (Al15Hf20Sc10Ti20Zr20 and Al5Hf20Sc20Ti20Zr20) are studied to elucidate the influence of the Al addition and of a possible short-range ordering on ultra-fast diffusion. The phase composition of the alloys was characterized by X-ray diffraction and transmission electron microscopy. The temperature dependence of the diffusion coefficients of Co is shown to follow Arrhenius behavior for all the alloys. The obtained results are compared on the homologous temperature scale with the solute diffusivities in other HCP matrices.