Microanalytical investigation of sintered FE-Nd-B magnets

Abstract

Fe-Nd-B is emerging as an important hard magnetic alloy system. The magnetic properties, in particular, the coercivity, are strongly influenced by the microstruetura1 condition of the magnet and are subject to degradation by various factors which can be understood only with the use of analytical electron microscopy. This investigation focuses on the characterization of inclusions discovered within a magnet which exhibits a kinked B-H loop.(Fig.1). Based on the microstructural investigation, an appraisal is made of the effect of these particles on the magnetic properties.