Abstract
The microstructure of hot-deformed Nd-Fe-B permanent magnets with different Nd contents was investigated in order to correlate them with the hard magnetic properties. A thick distinct Nd-rich grain boundary (GB) layer was observed in a high Nd content sample by scanning electron microscopy and transmission electron microscopy. Three-dimensional atom probe results showed a significant increase in the Nd content in the GB as the overall Nd content in the alloy increased. We found a clear correlation between the Nd concentration in the GB layer and the coercivity. The mechanism of the coercivity increase is discussed based on the microstructure characterization and micromagnetic simulation results.
| Original language | English |
|---|---|
| Pages (from-to) | 5387-5399 |
| Number of pages | 13 |
| Journal | Acta Materialia |
| Volume | 61 |
| Issue number | 14 |
| DOIs | |
| Publication status | Published - 2013 Aug |
| Externally published | Yes |
Keywords
- Chemical composition
- Coercivity
- Hot-deformed
- Microstructure
- Nd-Fe-B
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys