|About this Abstract
||2016 TMS Annual Meeting & Exhibition
||Advanced Magnetic Materials: An FMD Symposium in Honor of Michael E. McHenry
||A Solid-State Approach to Alnico-based Permanent Magnets
||Aaron Kassen, Emma White, Wei Tang, Andriy Palasyuk, Lin Zhou, Iver Anderson
|On-Site Speaker (Planned)
Commercial scale manufacturing of premium alnico magnets has primarily been accomplished through directionally-solidified casting. Historically, sintered (powder-based) alnico magnet properties were often inferior to their cast counterparts due to an isotropic fine grained microstructure and retained porosity. In this work, pre-alloyed powder-processed bulk magnets were produced using gas atomization, compression molding, and sintering into near-final shapes. Results show that this approach can mass produce alnico magnets with properties comparable to the current state-of-the-art. A modified composition of pre-alloyed alnico-“8” was high-pressure gas atomized, formed using a polypropylene carbonate binder, and sintered to full density. These bulk magnets were characterized to verify density and analyze microstructure using FE-SEM, OIM/EBSD and TEM. The influence of microstructure and grain texture on bulk magnetic properties was examined with hysteresisgraph measurements, as a function of heat treatment variations. Work funded by USDOE-EERE-VT-PEEM program through Ames Lab contract no. DE-AC02-07CH11358.
||Planned: None Selected