Microstructural Characterization of a High Copper (Nd0.75Pr0.25)2Fe14B Magnet

Abstract

A commercial magnet following the N 48 specification was submitted to a detailed microstructural characterization. The magnet presents 10 kOe of coercivity and good 2ndquadrant squareness. The grain size is around 10 micrometers. Scanning electron microscope (SEM) EDAX analysis shows that it is a high copper NdPrFeB alloy following the 3Nd:1Pr proportion, with some aluminum. The magnet was covered by a 15 micrometers layer, with nickel and copper. The microstructural data allow a better understanding of the effect of the alloying elements.