| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
On Dysprosium Utilisation in Multi-main-phase Nd‒Dy‒Fe‒B Magnets with Core‒Shell Microstructures |
| Author(s) |
Hansheng Chen, Zhiheng Zhang, Jiaying Jin, Bryan Lim, Xiaolian Liu, Wei Li, Mi Yan, Simon Ringer |
| On-Site Speaker (Planned) |
Hansheng Chen |
| Abstract Scope |
The development of high-performance Nd–Dy–Fe–B magnets that minimise the consumption of the scarce rare earth (RE) element Dy remains a major global scientific and technological quest. Here, we designed an alloy microstructure comprising of a uniform Dy-lean core–Dy-rich shell in a series of multi-main-phase (MMP) Nd–Dy–Fe–B magnets. The resulting MMP Dy3 magnet with an overall Dy level of 3 wt.% exhibited a high coercivity (2.38 T) with little diminishment in the remanent magnetisation (1.35 T) and maximum energy product (43.6 MGOe). These properties are even superior to the currently available sintered Nd–Dy–Fe–B magnets which utilise higher levels of Dy of 5 wt.%. Via magnetic and multi-scale microstructural characterisation experiments and micromagnetic simulations, the formation of the Dy-lean core–Dy-rich shell microstructure is rationalised via solid-state-diffusion and solution reprecipitation during liquid-phase sintering.
This work has been published in Acta Materialia (https://doi.org/10.1016/j.actamat.2023.119344). |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Characterization, Solidification |