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MM: Fachverband Metall- und Materialphysik

MM 2: Topical session (Symposium MM): High entropy and compositionally complex alloys

MM 2.8: Vortrag

Montag, 1. April 2019, 12:45–13:00, H43

The effect of magnetism on the stability of high entropy alloys — •Jakub Šebesta^1,2 and Dominik Legut¹ — ¹IT4Innovation, VŠB-TU Ostrava, 17.listopadu 15, 708 33 Ostrava-Poruba, Czech Republic — ²Charles University, Faculty of Mathematics and Physics, Department of Condensed Matter Physics, Ke Karlovu 5, 121 16 Praha 2, Czech Republic

Multi-principal elements alloys, called as ’High Entopy Alloys’, represent a promising group of materials, due to its possible applications in the industry. They form a single phase solid solution based on high number of components in near-equimolar composition, that often brings a high entropy contribution to the Gibbs free energy. It is considered as the main contribution stabilizing the alloy at higher temperatures. In the current work we’d like to focus on another contributions, which could affect stability of the system, i.e magnetic interactions among all atoms. Using ab-initio calculations based on TB-LMTO-ASA within CPA we studied the stability of the well known ’Cantor alloy’ CoCrFeMnNi as well as related phases with a nonmagnetic substitution were calculated. For a similar reason non-homogeneous structures and magnetic exchange interactions were studied as well. We show strenghts of the mutual interactions between the elements and their impacts on the stability of the alloy. Further we discuss the importance and its contribution of mutual exchange ineraction to the final preferred magnetic ordering of studied phase. Finally we’ll suggest possible way for stabilizing the parent structure.