Effect of Tb on the intrinsic coercivity and impact toughness of sintered Nd-Dy-Fe-B magnets

The effect of Tb on the coercivity and impact toughness of sintered Nd-Dy-Fe-B magnets has been investigated. The results showed that the addition of Tb enhanced the intrinsic coercivity, reduced the remanence and improved the impact toughness of sintered magnets. The optimum impact toughness of sintered magnets was achieved when 1.0 at% Tb was incorporated. The possible reasons for increasing the intrinsic coercivity and improving impact toughness of sintered magnets were analyzed, and the relations between the microstructure and impact toughness of sintered magnets were studied.