Abstract
The paper analyses the precipitation of γ2 phase within the γ'1 thermally induced martensitic matrix of five Cu-Al-Ni-Fe-Mn shape memory alloys (SMAs), by means of differential scanning calorimetry (DSC) thermograms, optical microscopy (OM) and scanning electron microscopy (SEM). It has been proved that the flat exothermic peaks, occurring during the heating of martensitic specimens, correspond to the formation of γ2 phase precipitates, which are characterized by two specific morphologies, with dendrite arms at about 90° and a120°, respectively. In spite of the presence of γ2 phase precipitates, the occurrence of thermal memory has been emphasized, characterized by shape recovery degrees higher than 96 %.
| Original language | English |
|---|---|
| Pages (from-to) | 1365-1369 |
| Number of pages | 5 |
| Journal | Journal of Optoelectronics and Advanced Materials |
| Volume | 10 |
| Issue number | 6 |
| Publication status | Published - Jun 2008 |
Keywords
- Critical temperatures
- Martensite
- Phase structure
- Precipitates
- Shape memory alloys