- Tytuł:
- Thermo-Mechanical Properties of an NiTi-Shape Memory Alloy after Dynamic Loading
- Autorzy:
-
Grigorieva, V.
Danilov, A.
Razov, A. - Powiązania:
- https://bibliotekanauki.pl/articles/1402089.pdf
- Data publikacji:
- 2015-10
- Wydawca:
- Polska Akademia Nauk. Instytut Fizyki PAN
- Tematy:
-
62.20.fg
81.30.Kf
81.70.Bt - Opis:
- The results of the comparative study of a quasi-equilibrium NiTi alloy's thermo-mechanical response to high-rate and quasi-static straining in the temperature range of 100-300°C, which included the $A_{f}$ and the $M_{d}$ temperatures, are considered. The existence of B2 → B19' and B2 → R → B19' martensitic transformations, associated with the heterogeneous distribution of Ni₄Ti₃ precipitates is shown to result in shaping of martensitic and austenitic two-way shape memories, the simultaneous presence of which determines the reversing shape memory effect. The suppression of stress-induced B2 → B19' transformation at temperatures higher than the $M_{d}$ temperature resulted in austenitic two-way shape memory only. Distinct dependences on the temperature of the critical stresses that initiate B2 → B19' and B2 → R → B19' martensitic transformations in austenite are shown to be the reason for the participation of the irreversible mechanisms of straining at the earliest stages of tension, whatever the strain-rate applied, thus annihilating the distinctions between the quasi-static and high-rate straining processes. As a result, the thermo-mechanical properties acquired after tension become practically independent of the strain-rate.
- Źródło:
-
Acta Physica Polonica A; 2015, 128, 4; 592-596
0587-4246
1898-794X - Pojawia się w:
- Acta Physica Polonica A
- Dostawca treści:
- Biblioteka Nauki
Artykuł