| Abstract Scope |
Alnico permanent magnets (PMs), a potential replacement PM for utilization in electric powered machines that contain rare earth (RE) PMs (e.g. interior PM motors in electric vehicles), need a large grained, <001> textured microstructure to have the best remanence and “squareness” of the second quadrant hysteresis loop, yielding the best energy product. Traditionally, this beneficial microstructure is obtained by directional solidification. However, to achieve this microstructure with a high-throughput fabrication approach, gas atomized, spherical alnico powder was compression molded, sintered, and solid-state grain aligned (SSGA). SSGA is a method to selectively bias the abnormal grain growth (AGG) close to the <001> direction via an applied load at high temperatures to yield large grained (>1 mm), <001> textured, powder-based alnico magnets. This presentation will discuss extending the SSGA method to strategically designed, high-coercivity alnico alloys, both Co-lean and full-Co alloys, and their resulting microstructures and properties. Work supported by USDOE. |