|About this Abstract
||2017 TMS Annual Meeting & Exhibition
||Materials Science for High-Performance Permanent Magnets
||New Hard Magnetic ThMn12-type phases with Low Rare Earth Contents for Permanent Magnet Applications
||Andrés Martín-Cid, Daniel Salazar, Aleksander Gabay, Ana María Schönhöbel, Jose Javier Garitaonandia, Jose Manuel Barandiaran, George Costas Hadjipanayis
|On-Site Speaker (Planned)
In recent years, the critical supply of the raw rare-earth materials, has motivated the search for and rare earth-free and rare-earth-lean hard magnetic materials. Tetragonal R(Fe,M)<sub>12</sub> compounds (R = rare earth), with the ThMn<sub>12</sub> phase structure, have long been of interest as permanent magnet materials with reduced R content, but some stability issues have to be overcome first. To further exploit the advantage of low R content, particular attention has been recently paid to compounds with cerium, the most abundant and least “critical” rare earth metal. Zr substitution for Ce in the CeFe<sub>10</sub>Si<sub>2</sub> and Sm for Ce in the CeFe<sub>9</sub>Co<sub>2</sub>Ti alloys stabilizes the 1:12 structure. The alloys have a single ThMn<sub>12</sub> phase at several substitutions. High magnetization (>100emu/g), Curie temperatures >300ºC and coercivity enhanced by Zr and Sm substitutions, make them suitable for permanent magnet applications.
This work has been funded by the EU-Horizon2020 project NOVAMAG-686056 and DOE-DE-FG02-90ER45413.