Development of FeCoMnAl multi-principal element alloys and soft magnetic powder cores with excellent magnetic properties and high temperature magnetic stability

• DOI: 10.1016/j.matdes.2024.112787
• Publication Date: 2024-02-23T11:04:59Z
• Authors: Liping Yang; Yaqiang Dong; Wei Gao; Xingjie Jia; Junyao Zhang; Yanqiu Li; Qiang Li; Qikui Man; Baogen Shen
• Keywords: Thermal Stability; Magnetic alloy

In order to develop a multi-principal element alloy with outstanding soft magnetic properties and high thermal stability, Fe35Co35Mn30−xAlx (x = 9, 12, 15, 18, 21, 24) system was designed. The findings demonstrated that the optimal Al/Mn content ratio contributes formation of BCC B2 dual-phase structure, which leads significant increase in saturation flux density (Bs) considerable decrease coercivity alloy. as-cast Fe35Co35Mn15Al15 co-lattice structure exhibits exceptional properties, resistivity 324 μΩ·cm, Bs 1.46 T Hc 167.2 A/m. Corresponding powder cores (SMPCs) were fabricated impact heat treatment temperature on SMPCs examined. after annealing at 660 °C stable permeability (μe) 48 up 10 MHz, low core loss (Pcv) 1208 mW/cm3 (at 1 20 mT), excellent direct current bias performance. addition, these possess variation both μe Pcv frequency (1 MHz) is less than 2 % over wide range 25–150 °C.