Dresden 2020 – wissenschaftliches Programm

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MM: Fachverband Metall- und Materialphysik

MM 12: Transport - High Entropy Alloys

MM 12.4: Vortrag

Montag, 16. März 2020, 16:30–16:45, IFW A

Tracer diffusion in the Ni–CoCrFeMn system: transition from a dilute solid solution to a high entropy alloy — •Josua Kottke1, Adnan Fareed1, Shabnam Taheriniya1, Ziyuan Rao2, Zhiming Li2, Mathilde Laurent-Brocq3, Loïc Perrière3, Łukasz Rogal4, Harald Rösner1, Sergiy V. Divinski1, and Gerhard Wilde11Institute of Materials Physics, University of Münster, Münster, Germany — 2Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 3Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, F-94320, Thiais, France — 4Institute of Metallurgy and Materials Science of the Polish Academy of Sciences, 30-059 Krakow, Poland

High-entropy alloys, i.e. multicomponent alloys with a large number of constituting elements in equiatomic or nearly equiatomic composition, attract an increased attention as potential structural materials due to their favorable physical and mechanical properties, especially at elevated temperatures. Here, we report on the kinetic properties and the microstructural response regarding the transition from a pure metal (Ni) to a dilute solid solution and finally to a high entropy alloy within a single-phase FCC domain. Tracer diffusion rates of all elements are measured in Co20Cr20Fe20Mn20Ni20, Co10Cr10Fe10Mn10Ni60 and Co2Cr2Fe2Mn2Ni92 alloys and are compared to those in pure Ni. The volume diffusion data substantiate that the proposed ’sluggish’ diffusion is at least an ambiguous concept. Grain boundary diffusion shows a number of unexpected features which are related to the microstructure characteristics and have been further analyzed by TEM and APT.

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