Abstract
This chapter discusses the basis magnetic properties, microstructure, and annealing behavior of melt-spun NdFeB materials. These materials derive their permanent magnet properties from the Nd2Fe14B intermetallic compound and the primary focus of the chapter is how the properties and microstructure of a series of Nd0.15(Fe1–yBy)0.85 alloys change as the composition and quench rate are varied. The current theories on what causes the significant change in magnetic properties that are observed as the quench rate is varied are also presented. Finally, the magnetization process and coercivity mechanism that is believed applicable for these isotropic materials is discussed, including the important role that intergrain exchange interactions are now believed to play in determining the magnetic properties. The final section in this chapter discusses nanocomposite permanent magnets, which are also melt-spun materials that based on the Nd2Fe14B phase but also contain α-Fe and Fe3B. The magnetic properties of these materials are also believed to be highly influenced by intergrain exchange interactions.
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