|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Phase Transformations and Microstructural Evolution
||F-77: Relationship of Microstructural Evolution to Magnetic Properties of Alnico Magnets
||Wei Tang, Lin Zhou, Andriy Palasyuk, Kevin Dennis, Jun Cui, Matthew Kramer, Iver Anderson
|On-Site Speaker (Planned)
Alnico is an attractive non-rare earth permanent magnet due to its excellent thermal stability and corrosion resistance. However, the best coercivity Hcj and maximum energy product (BH)max of commercially available alnico 8 magnets are only about 2000 Oe and 6.0 MGOe. A key to improving the magnetic properties is to enhance Hcj. It is generally recognized that Hcj depends on the shape anisotropy of ferromagnetic Fe-Co precipitates (α1-phase) that is finely dispersed in a non-magnetic Ni-Al-based matrix phase (α2-phase) by spinodal decomposition (SD) through appropriate heat treatments. The relationship of composition, microstructure and processing to magnetic properties was systematically studied and revealed. A Hcj of nearly 3000 Oe was achieved, which is very promising to greatly improve the magnetic properties of the magnets. Supported by the DOE-EERE-VT-EDT program under the DREaM project at the Ames Laboratory, operated for the U.S. DOE by Iowa State University under contract no. DE-AC02-07CH11358.
||Planned: Supplemental Proceedings volume