A comprehensive study on texture evolution and recrystallisation behaviour of Fe‐50Co alloy

Abstract

AbstractThe Fe‐Co alloy, a soft magnetic alloy with high saturation magnetic induction strength and Curie temperature, is widely used in high‐performance power generation applications such as airborne radars and electromagnets. In order to improve the magnetic properties, different annealing treatment was employed to tailor the texture of Fe‐50Co alloy. The present work investigated the evolution mechanism of microstructure, texture and magnetic properties of the Fe‐50Co alloy during cold rolling and annealing treatment. The results showed that with increasing reduction ratio, the cold rolling texture primarily consisted of γ and α textures. After annealing, the dominant texture of the alloy transformed into {411}<148> and {111}<112> textures. The increase of annealing temperature weakened the {111}<110> texture while facilitating the development of new, diffuse, and randomly oriented grains. The grain size increased to 40 μm after annealing at 900°C. The alloy exhibited excellent magnetic properties after annealing at 900°C followed by furnace cooling to 750°C with a cooling rate of 50°C/h and then to 300°C with a cooling rate of 180°C/h; the B5000 was ∼2.3 T and P1.5/400 was ∼59 W/kg. A novel route to develop Fe‐50Co alloys with excellent magnetic properties was provided.