Abstract
Phase transformation, microstructure and magnetic properties were investigated for Cu-(11-14) mol%Mn-20mol%Ga. The structures of the magnetic domains were also investigated by Lorentz microscopy and electron holography. Plate-like martensite phase(ζM, ordered hcp) was observed in as-quenched Cu-12 mol%Mn-20mol%Ga. Phase transformation from ζM martensite to ζ phase(hcp) occurred at around 540K on heating. The ζ phase decomposed into ζ″ (ordered hcp) and β(bcc) phase at around 700 K, then became the single β phase at around 840 K. By subsequent slow cooling, ζ phase was observed at room temperature. The results obtained from Lorentz microscopy and electron holography revealed that the twin plates of ζM martensite and the magnetic domain have one-to-one correspondence, suggesting high magneto-crystalline anisotropy energy of the martensite phase. The saturation magnetization and the Curie temperature increased with Mn content.
| Original language | English |
|---|---|
| Pages (from-to) | 2840-2846 |
| Number of pages | 7 |
| Journal | Materials Transactions |
| Volume | 48 |
| Issue number | 11 |
| DOIs | |
| Publication status | Published - 2007 Nov |
Keywords
- Ferromagnetic shape memory alloy
- Magnetic domain
- Martensitic transformation
- Twin
ASJC Scopus subject areas
- Materials Science(all)
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering