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Effect of Secondary Decomposition on Coercivity of Fe-Co-Cr Alloys with 15% Co

The microstructure and magnetic properties of Fe-Co-Cr alloys with 15 wt % Co were investigated using transmission electron microscopy and magnetic measurements. The secondary decomposition within both the α2-phase matrix and the α1-phase particles was observed for magnets subjected thermo-magnetic treatment and subsequent stepped aging or continuous-cooling treatments. During high-temperature treatments (630-600 оC), when the α2 phase is dominant (the volume fraction is more than 50%), the secondary decomposition of this phase takes place (α2 → α1' + α2'). The deterioration of magnetic insulation of α1-phase particles results in the decrease in the coercive force of alloys. Below 600 оC, when the α1 phase is dominant (the volume fraction is more than 50%), the splitting of elongated α1-phase particles occurs. When the temperature of stepped-aging decreases in high steps, the secondary decomposition (α1 → α1' + α2') leads to the splitting of initial α1-phase particles into fine slightly elongated particles and the decrease in the coercive force.