About this Abstract |
Meeting |
2020 TMS Annual Meeting & Exhibition
|
Symposium
|
Advanced Magnetic Materials for Energy and Power Conversion Applications
|
Presentation Title |
Controlling and Describing Coercivity of Rare Earth Permanent Magnets |
Author(s) |
Satoshi Hirosawa |
On-Site Speaker (Planned) |
Satoshi Hirosawa |
Abstract Scope |
Controlling coercivity and its temperature dependence has been the central issue in recent developments of high-performance rare earth permanent magnets. Manipulation of distribution profiles of constituent elements in fine-grained magnets utilizing subtle differences among chemical potentials of elemental species has become important in controlling coercivity in processes such as grain boundary diffusion or infiltration. However, even after decades of investigations, many aspects concerning thermodynamic (meta)stability and factors limiting achievable coercivity of the Nd2Fe14B-based magnets remain unexplained. The situation is more so for recently revisited 1-12-type magnets. Describing coercivity of the deliberately complex microstructure is still difficult and theoretical calculations of the effects of temperature and local magnetic fluctuations are on the way of developments. This talk will summarize some of recent progresses in the above mentioned topics. |
Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |