Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 14: Topical session (Symposium MM): High entropy and compositionally complex alloys
MM 14.4: Vortrag
Dienstag, 2. April 2019, 11:15–11:30, H43
abnormal magnetic behavior of FeNiCoMnCu high entropy alloys — •ziyuan rao1, zhiming li1, fritz körmann1,2, biswanath dutta2, dirk ponge1, lukas schäfer3, konstantin skokov3, oliver gutfleisch3, and dierk raabe1 — 1Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, 40237 Düsseldorf, Germany — 2Materials Science and Engineering, Delft University of Technology, 2628 CD Delft, The Netherlands — 3Institut für Materialwissenschaft, Technische Universität Darmstadt, Darmstadt, Germany
In this project experimental and theoretical calculations are combined to unveil an abnormal magnetic behavior caused by the addition of nonmagnetic element Cu in face-centered cubic FeNiCoMn-based high entropy alloys (HEAs). We found that saturation magnetization of the as-cast HEAs at room temperature increases by 77% and 177% at Cu contents of 11 at. % and 25 at. %, respectively, compared to the equiatomic FeNiCoMn HEA without Cu addition. For HEAs homogenized at 1273 K for 2 h and water-quenched, the magnetic state transforms from paramagnetism to ferromagnetism at room temperature after 25 at. % Cu addition. For homogenized HEAs, ab initio calculations reveal an increase of Curie temperature caused by Cu addition and agree well with experimental results. By coupling the experimental and theoretic results, we unveiled the mechanisms responsible for the Cu effect on the magnetic properties of FeNiCoMn HEAs, which is fundamentally different from that reported in conventional binary or ternary alloys.