NdFeCoAlB alloys

Recently, we have studied the effect of B and  preparation routes (mold casting, melt spinning, and mechanical alloying) on the magnetic and structural properties of following compositions : 

• Nd₅₇Fe₂₀Co₅B₈Al₁₀

• Nd₅₇Fe₂₀Cu₅B₈Al₁₀

• Nd₄₀Fe₄₀Co₅B₇Al₈

We have shown that for Nd₄₀Fe₄₀Co₅Al₈B₇, Nd₅₇Fe₂₀Co₅Al₁₀B₈, and Nd₅₇Fe₂₀Cu₅Al₁₀B₈ alloys an amorphous structure can be formed by mechanical attrition and melt spinning. The alloys prepared by different methods, show different magnetic and thermal behaviour despite the similar XRD patterns (Figs. 1 and 2). The mold-cast rods exhibit relatively hard magnetic behavior with coercivity about 270 kA/m at room temperature in contrast to quenched ribbons and milled powders, which show soft magnetic behavior. More details can be found elsewhere [1-3] .

Fig.1 : The DSC curves of Nd40Fe40Co5Al8B7 alloys prepared by ball milling, melt spinning, and mold casting.	Fig.2 : The M-H loops of Nd40Fe40Co5Al8B7 alloys prepared by different methods.

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