The effect of Co substitution for Fe on the structure and magnetic properties of mechanically milled Nd8Fe88B4 has been investigated. As-milled Nd8(Fe1−xCox)88B4 (x=0–0.6) alloys exhibited a two-phase mixture consisting of an amorphous phase and a bcc FeCo phase. Optimal annealing of the as-milled samples led to the formation of a nanocrystalline mixture of Nd2(FeCo)14B and a bcc FeCo phase. The optimally annealed samples exhibited single-phase magnetic behavior and remanence enhancement. Replacement of up to 20% of Fe by Co increased both remanence and coercivity. Over substitution of Co and heat treatment at temperatures exceeding 600 °C caused the deterioration of both remanence and coercivity.
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Miao et al. (1997) studied this question.
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