| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advances in Magnetism and Magnetic Materials
|
| Presentation Title |
Microstructure-Property Relationship for Hot Deformed Fine-grained NdFeB Magnet with High Magnetic Properties Through Two-step Spark Plasma Sintering |
| Author(s) |
Ziyi Wu, Dong Zhao, Baozhi Cui, Lian Jie |
| On-Site Speaker (Planned) |
Ziyi Wu |
| Abstract Scope |
Hot-deformed Nd2Fe14B-based magnets have attracted much research interest due to its potential high coercivity while eliminating heavy rare earth (HREE) elements. Conventional melt-spun HREE-free Nd-Fe-B ribbons with an isotropic nanograin (~50 nm) are used to manufacture hot-deformed anisotropic NdFeB magnets. It was found that controlling abnormal grain growth and achieving a high aspect ratio of fine-grains during hot deformation is critical to obtaining both high coercivity and (BH) max. In our study, we developed a novel two-step process using spark plasma sintering (SPS) to manufacture high-performance magnets. Nd-Fe-B ribbons were first highly densified by a novel cold sintering at 350 °C and 300 MPa to preserve the nanosized grains. The bulk was then quickly hot-deformed at 710 °C until fully densified, resulting in an anisotropic fine plate-like grain microstructure. The magnet obtained an intrinsic coercivity Hci of 11.2 kOe, remanence Br of 14.2 kGs, and a (BH) maxof 47 MGOe. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Magnetic Materials, Powder Materials, Process Technology |