Effect of Pr and Dy substitution on the impact resistance of sintered Nd–Fe–B magnets

The impact resistance of sintered Nd–Fe–B magnets with nominal compositions (Nd1−xDyx)16Fe78B6 (x = 0, 0.05, 0.10, 0.15) and (Nd1−yPry)16Fe78B6 (y = 0, 0.33, 0.67, 1) has been investigated by the falling-weight impact test. The bending strength and the Vickers hardness were measured. It shows that the Dy substituted magnets have better impact resistance than the Pr substituted magnets. The impact resistance of the investigated magnets improves monotonously with increasing Dy content, and reduces with increasing Pr content, which seems to relate closely to the change of the density or of the hardness.