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Abstract
The magnetic properties of melt spun ribbon, hot pressed and die-upset forged Fe79 − xNd15B6Gax (x = 0–1.5 at%) magnets have been investigated. It has been found that Ga additions up to 1 at% significantly increase the coercivity of the Fe-Nd-B alloys but further additions cause a dramatic decrease in coercivity. Gallium contents to 1 at% do not influence the Curie temperature of the magnets although the melting point of the grain boundary Nd-rich phase is significantly reduced. The optimum properties for the die-upset magnet have been established at 0.25 at% Ga whereby a 25% increase in coercivity has been observed with little loss in remanence and energy product. We attributed the initial changes in the magnetic properties of Fe-Nd-B dieupset forged magnets containing Ga to the reduction of the melting temperature of the boundary phase resulting in better magnetic isolation of the hard magnetic grains and the pinning effect of the precipitates of Ga-rich phases.
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