NEW STRUCTURAL STATE IN MELT-SPUN ND-FE-B ALLOYS

Microstructure and magnetic properties of the Nd-Fe-B ribbons prepared by melt-spinning technique have been studied. A new structural state of the material was observed. This state is characterized by large cry stallites of about 1 mu m size which are composed of aligned precipita tes of approximately 50 nm, separated by amorphous layers of 3-5 nm wi dth forming a regular net. The ability to form this structural state p romises the development of an industrial scale production method of an isotropic hard-magnetic R-Fe-B powders suitable for bonded magnets.