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MM: Fachverband Metall- und Materialphysik
MM 14: Topical session (Symposium MM): High entropy and compositionally complex alloys
MM 14.7: Vortrag
Dienstag, 2. April 2019, 12:30–12:45, H43
Heat capacity, defect annihilation and tracer diffusion in the Ni–CoCrFeMn system: transition from a dilute solid solution to a high entropy alloy — •Josua Kottke1, Jonas Lübke1, Adnan Fareed1, Daniel Gaertner1, Mathilde Laurent-Brocq2, Loïc Perrière2, Łukasz Rogal3, Sergiy V. Divinski1, and Gerhard Wilde1 — 1Institute of Materials Physics, University of Münster, Münster, Germany — 2Université Paris Est, ICMPE (UMR 7182), CNRS, UPEC, F-94320, Thiais, France — 3Institute 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 changes in thermodynamic and kinetic properties regarding the transition from a dilute solid solution to a high entropy alloy.
The true heat capacity and tracer diffusion of all elements are measured in Co20Cr20Fe20Mn20Ni20, Co10Cr10Fe10Mn10Ni60 and Co2Cr2Fe2Mn2Ni92 and compared to those in pure Ni. Furthermore, the annihilation of deformation-induced vacancies and the recrystallisation kinetics are investigated using differential scanning calorimetry. While tracer diffusion does not reveal any abrupt transition, the defect evolution and the microstructural response are shown to be distinct in the Co10Cr10Fe10Mn10Ni60 alloy.