Influence of Co, Ga and Si on the microstructure and the magnetic properties for nanocomposite permanent alloys

The influence of addition trace elements Co, Ga and Si on the microstructure and the magnetic properties of nanocomposite permanent alloys based on Fe3B are investigated. The experimental results show that in comparison to the ternary component (Nd–Fe–B) nanocomposite permanent alloy, the crystallization temperature was decreased, the Curie temperature was increased, the mean grain size of annealed samples was decreased and the exchange coupling interaction between the grains was enhanced for the nanocomposite permanent alloy with these addition elements. These variations cause both coercivity and remanent magnetic induction to increase to different degrees, and so the maximum magnetic energy product of nanocomposite increases.