Effects of composition and microstructure on intergrain interactions of nanocomposite Pr2Fe14B/alpha-Fe material

The effects of contents of Fe and B and microstructure on the intergrain in teractions in the nanocomposite Pr2Fe14 B/alpha -Fe permanent magnetic mate rials are investigated by measuring the deltaM-H curves. The intergrain int eractions become stronger with the increase in the content of Fe. The large r deltaM value of the ribbon samples corresponds to the smaller grain size and uniform grain size distribution, which are favorable factors strengthen ing the intergrain interactions and exchange-coupling. The non-ferromagneti c phase Pr1.1Fe4B4 is found in grain boundaries when the content of B is la rger, which weakens the intergrain interactions.