The electrical resistivity (ER) of Flexinol nickel-titanium shape memory alloys (SMA) has been measured in the range from -15 to 105 degrees C. The investigated Flexinol wires have two diameters, 150 and 375 mu m. The experimental results show new temperatures of phase transformation (TTR) evidencing the unexpected presence of the R-phase. The transformations from austenite to martensite, from austenite to R-phase, and vice versa are simultaneous. In the range [20 to 110 degrees C] the hysteresis is almost negligible, whereas in the range [-15 to 105 degrees C] the accommodation process of the hysteresis is observed.
Gori, F., Carnevale, D., DORO ALTAN, A.m., Nicosia, S., Pennestri', E. (2006). A new hysteretic behavior in the electrical resistivity of flexinol shape memory alloys versus temperature. INTERNATIONAL JOURNAL OF THERMOPHYSICS, 27(3), 866-879 [10.1007/s10765-006-0060-3].
A new hysteretic behavior in the electrical resistivity of flexinol shape memory alloys versus temperature
GORI, FABIO;CARNEVALE, DANIELE;DORO ALTAN, ANNA MARIA;NICOSIA, SALVATORE;PENNESTRI', ETTORE
2006-01-01
Abstract
The electrical resistivity (ER) of Flexinol nickel-titanium shape memory alloys (SMA) has been measured in the range from -15 to 105 degrees C. The investigated Flexinol wires have two diameters, 150 and 375 mu m. The experimental results show new temperatures of phase transformation (TTR) evidencing the unexpected presence of the R-phase. The transformations from austenite to martensite, from austenite to R-phase, and vice versa are simultaneous. In the range [20 to 110 degrees C] the hysteresis is almost negligible, whereas in the range [-15 to 105 degrees C] the accommodation process of the hysteresis is observed.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
