Abstract
This chapter discusses the discovery of the Nd2Fe14B intermetallic phase at the General Motors Research Laboratories. The problem that researchers encountered when trying to develop a rare earth-iron based permanent magnet has always been the lack of a suitable intermetallic phase and the full scope of this problem is briefly reviewed. The route to the discovery of this new family of permanent magnets at General Motors was an outgrowth of attempts to produce metastable intermetallic compounds from rapidly solidified Nd–Fe and Pr–Fe alloys. This resulted in the discovery that metastable phases with coercivities as high as 8kOe could be produced by melt spinning binary R–Fe alloys over a range of quench rate. This chapter reviews this research, which eventually led to the discovery of the equilibrium Nd2Fe14B intermetallic phase and the melt spun magnetic powder that is used to produce bonded Nd magnets today.
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