Berlin 2024 – scientific programme
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MA: Fachverband Magnetismus
MA 7: Bulk Magnetic Materials and Magnetic Particles/Clusters
MA 7.5: Talk
Monday, March 18, 2024, 10:30–10:45, EB 407
Strong and ductile high temperature soft magnets through Widmanstätten precipitates — •Liuliu Han1, Dierk Raabe1, Oliver Gutfleisch2, Fernando Maccari2, Ivan Soldatov3, and Rudolf Schäfer3 — 1Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany — 2Department of Material Science, Technical University of Darmstadt, 64287 Darmstadt, Germany — 3IFW Dresden, Institute for Metallic Materials, Helmholtzstr. 20, 01069 Dresden, Germany
Fast growth of sustainable energy production requires massive electrification of transport, industry and households, with electrical motors as key components. These need soft magnets with high saturation magnetization, mechanical strength, and thermal stability to operate efficiently and safely. Reconciling these properties in one material is challenging because thermally-stable microstructures for strength increase conflict with magnetic performance. Here, we present a material concept that combines thermal stability, soft magnetic response, and high mechanical strength. The strong and ductile soft ferromagnet is realized as a multicomponent alloy in which precipitates with a large aspect ratio form a Widmanstätten pattern. The material shows excellent magnetic and mechanical properties at high temperatures while the reference alloy with identical composition devoid of precipitates significantly loses its magnetization and strength at identical temperatures. The work provides a new avenue to develop soft magnets for high-temperature applications, enabling efficient use of sustainable electrical energy under harsh operating conditions.