Regensburg 2019 – scientific programme
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MM: Fachverband Metall- und Materialphysik
MM 8: Topical session (Symposium MM): High entropy and compositionally complex alloys
MM 8.6: Talk
Monday, April 1, 2019, 18:00–18:15, H43
Tuning magnetic properties of high entropy alloys: A combined theoretical and experimental study — •Biswanath Dutta1, Ziyuan Rao2, Lukas Schäfer3, Zhiming Li2, Oliver Gutfleisch3, Fritz Körmann1,2, and Dierk Raabe2 — 1Materials Science and Engineering, TU Delft, Delft, Netherlands — 2Max-Planck-Institut für Eisenforschung GmbH, Düsseldorf, Germany — 3Institut für Materialwissenschaft, TU Darmstadt, Germany
Magnetic properties of high entropy alloys (HEAs) have been a topic of growing research in the last years. Of particular interest are subtle changes in magnetic features due to the substitution of non-magnetic elements in magnetic HEAs. Using ab initio calculations, we investigate the impact of Cu on magnetic properties of FCC FeCoNiMn alloys. The coherent potential approximation is employed to address the chemical disorder while the high temperature paramagnetic state is treated within the disordered local moment approach. Among the considered magnetic states, our calculations reveal an antiferromagnetic order for Mn atoms in the lowest energy state. The impact of this on the prediction of Curie temperatures is subsequently discussed. We show that both the Curie temperature and the saturation magnetization increase due to Cu substitution. The obtained compositional trends are discussed in terms of varying concentration of magnetic elements and volume changes. Our predicted trends of the magnetic properties also show excellent agreement with the corresponding experimental results. Based on the achieved results we identify Cu as a promising element to tune and improve magnetic properties of FeCoNiMn-based HEAs.