Relationship between structural and magnetic properties of 48Ni–52Fe laminates: improvement study induced by annealing conditions

48Ni–52Fe laminates are useful in many applications, especially in stepper motors, watches, relays, transformers, etc. This paper presents an evolution of the microstructural and magnetic properties of 48Ni–52Fe alloy in the form of laminates treated under different annealing conditions. The relationship of microstructure, heat treatment parameters (annealing and surface oxidation), saturation magnetization (M s ), and coercivity (H c) is established. FCC crystalline structure with considerably large grains was observed after the annealing (1050 °C, 2 h) with significantly increased grain size. Magnetic characterization revealed that after applying heat treatment, a significant improvement of saturation magnetization along with a decrease in coercivity value was observed. Post-annealing oxidation treatment (400 °C, 2 h), helped to improve the hardness of the samples; however, a slight decrease in the magnetic properties was observed.