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MM: Fachverband Metall- und Materialphysik
MM 15: Poster session I
MM 15.25: Poster
Monday, March 7, 2016, 18:00–20:00, Poster B3
Low-temperature heat capacity and magnetization of CoCrFeNi and CoCrFeNiMn high-entropy alloys — •Josua Kottke1, Martin Peterlechner1, Mayur Vaidya1,2, Blazej Grabowski3,4, Fritz Koermann3,4, Jörg Neugebauer3, Sergiy Divinski1, and Gerhard Wilde1 — 1Westfälische Wilhelms-Universität Münster, Germany — 2Indian Institute of Technology Madras, Chennai, India — 3Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany — 4Materials Science and Engineering, TU Delft, Delft, Netherlands
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 a potential structural material due to attractive mechanical and physical properties. We report on the first measurements of low-temperature heat capacity of four- (CoCrFeNi) and five-component (CoCrFeNiMn) high-entropy alloys in the temperature interval from 1.9 to 400 K. The measurements were performed with and without application of a magnetic field (8T). Furthermore, room-temperature hysteresis loop and magnetization were measured in these alloys. The experimental data are compared with density-functional-theory-based calculations and a close agreement is seen. The deviations between the mean-field based theoretical results and direct experimental data are discussed in terms of probable ordering effects.