Abstract
The R-phase transformation in a Ti50Ni48Fe2 alloy was studied by in-situ electron microscopy with double-tilt cooling stages and an energy-filter, and the controversial incommensurability in the early stage of the transformation was examined by using imaging plates, which have high sensitivity and are easy to access to computer analysis. As a result, the transformation was shown to proceed in the following way. The R-phase transformation starts at Rs point, where the electrical resistance starts to increase, from the B2 parent phase with weak diffuse scattering to the commensurate R-phase with a sharp interface. Thus, the transformation is a first order throughout, and the temperature hysteresis represents the two-phase region of the B2 parent and the commensurate R-phase.
Original language | English |
---|---|
Pages (from-to) | 714-723 |
Number of pages | 10 |
Journal | Materials Transactions, JIM |
Volume | 39 |
Issue number | 7 |
DOIs | |
Publication status | Published - 1998 Jul |
Keywords
- Commensurate
- Electron microscopy
- Energy-filtering
- Imaging plate
- Incommensurate
- Martensitic transformation
- R-phase transformation
- Shape memory effect
- Superlattice
- Titanium-nickel-iron alloy
ASJC Scopus subject areas
- Engineering(all)