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The effect of different heat treatments on coercivity (Hc) has been investigated in three different Nd–Fe–B magnets. These were: commercially available Dy-free and Dy-containing Nd–Fe–B sintered magnets, both with minor additions of Al and Cu, and a third Nd–Fe–B sintered magnet which contained no measurable Cu but a similar amount of Al to the other materials. Heat treating the materials in the as-sintered...
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