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摘要
Nanostructured Nd9.5Fe84-xB6.5Tax (x = 0, 0.5, 1, 1.5, and 2) ribbons composed of Nd2Fe14B and alpha-Fe phases with a high coercivity and maximum energy product are fabricated by direct melt spinning. The effects of Ta addition on the structures and magnetic properties of melt-spun Nd9.5Fe84-xB6.5Tax (x = 0, 0.5, 1, 1.5, and 2) ribbons have been investigated. Compared with addition-free ribbons, small addition of Ta is found to reduce the grain sizes of the samples and improve their magnetic properties due to a strong exchange coupling between the Nd2Fe14B hard phase and alpha-Fe soft phase. A coercive field of 750 kA/m and a maximum energy product of 158 kJ/m(3) in melt-spun Nd9.5Fe82.5B6.5Ta1.5 ribbons are obtained at room temperature.
