Abstract
The R-phase in a Ti-47.75at%Ni-1.5at%Fe alloy was investigated to find whether or not it shows the martensite ageing effect as is the case in other thermoelastic alloys. The effect of ageing the R-phase was examined on the reverse transformation temperature to the B2 parent phase, the critical stress for the rearrangement of R-phase variants and the Young's modulus, which are the typical parameters to exhibit a remarkable change with the martensite ageing. All the parameters were confirmed to remain unchanged even by the low temperature (around room temperature) ageing for more than 72 hr., which is quite in contrast to the case for the ζ2′ martensite in a Au-49.5at%Cd alloy, despite the close crystal structures to each other. The electric resistance measurements suggested that the lower vacancy concentration in a Ti-47.75at%Ni-1.5at%Fe alloy, compared with that for the ζ2′ martensite in a Au-49.5at%Cd alloy, is responsible for the absence of the martensite ageing effect in the R-phase.
| Original language | English |
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| Pages | 233-238 |
| Number of pages | 6 |
| Publication status | Published - Jan 1 1998 |
| Externally published | Yes |
| Event | Proceedings of the 1996 International Conference on Displacive Phase Transformations and their Applications in Materials Engineering - Urban, IL, USA Duration: May 8 1996 → May 9 1996 |
Other
| Other | Proceedings of the 1996 International Conference on Displacive Phase Transformations and their Applications in Materials Engineering |
|---|---|
| City | Urban, IL, USA |
| Period | 5/8/96 → 5/9/96 |
All Science Journal Classification (ASJC) codes
- Engineering(all)