Fine Alnico 8 spherical powder produced by gas atomization was consolidated through hot
pressing (HP), hot isostatic pressing (HIP), and compression molding and subsequent
sintering (CMS) techniques. The effects of different fabrication techniques and processing
parameters on microstructure and magnetic properties were analyzed and compared. The
HP, HIP, and CMS magnets exhibited different features in microstructures and magnetic
properties. Magnetically annealed at 840° C for 10 min and subsequently tempered at 650° …

Recent concern for supply and price of rare earth (RE) metals has stimulated the search for
alternative magnets [1]. Alnico is an attractive non-RE magnet alloy due to its excellent
magnetic stability. However, the best energy product (BH) max of the magnets is only about
10 MGOe. A key to improving the magnetic properties is to enhance coercivity H ci by
optimizing composition and microstructure [2]. While our efforts focus on how to improve the
magnetic properties, new fabrication technologies of bulk alnico magnets are widely studied …