Abstract
The effect of a high magnetic field on coercivity was investigated in the annealing process for sintered Nd- Fe-B magnets containing Dy 10 wt.%. In a sample containing Cu 0.13 wt.%, a coercivity value Hc of 36 kOe was obtained for an annealing temperature Ta of 475°C under an annealing field Ha of 140 kOe. This value of Hc is 20% larger than that for the control sample (Ta = 475°C and Ha = 0). In samples without Cu, Hc values were considerably smaller (< 27 kOe) and no such enhancement of the coercivity by the magnetic fields was observed. The DSC curves exhibited a marked endothermic reaction just below 500°C only for samples containing Cu. This temperature is attributed to a eutectic point of Nd70Cu30. A possibility of field-induced alignment of Nd-rich grains in a matrix of Nd-Cu liquid is discussed; this would be closely related to the coercivity enhancement.
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