Dresden 2020 – wissenschaftliches Programm
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MM 12.1: Vortrag
Montag, 16. März 2020, 15:45–16:00, IFW A
Solute and self-diffusion in HCP high entropy alloys — •Sandipan Sen1, Mayur Vaidya1, Lukasz Rogal2, Xi Zhang3, Blazej Grabowski3,4, Sankaran Shanmugam5, 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, 40237 Düsseldorf, Germany — 4Institute of Materials Science, University of Stuttgart, 70569 Stuttgart Germany — 5Department of Metallurgical and Materials Engineering, Indian Institute of Technology Madras, Chennai-600036, India
Diffusion studies in high entropy alloys (HEAs) are still scarce and practically limited to FCC systems. For the first time, diffusion in HCP HEAs is investigated using a radiotracer technique. Solute diffusion of Co and self-diffusion of Zr are systematically measured in binary HfZr, ternary HfZrTi, and quinary Al-Hf-Sc-Ti-Zr alloys in the temperature range of 400*C to 1100 *C. The phase composition of the alloys is characterized by X-ray diffraction and transmission electron microscopy. Two quinary systems (Al15Hf25Sc10Ti25Zr25 and Al5Hf25Sc20Ti25Zr25) are studied to examine the influence of the Al addition and potential ordering. A comparative study of the solute and self-diffusion is made to understand the impact of chemical disorder and of potential ordering on the diffusion properties in these systems.