A New Hysteretic Behavior in the Electrical Resistivity of Flexinol Shape Memory Alloys Versus Temperature |
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| Authors: | F. Gori D. Carnevale A. Doro Altan S. Nicosia E. Pennestrì |
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| Affiliation: | (1) Department of Mechanical Engineering, University of Rome “Tor Vergata”, Via de Politecnico 1, 00133 Rome, Italy;(2) Department of Information, Systems and Production, University of Rome “Tor Vergata”, Via del Politecnico 1, 00133 Rome, Italy |
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| Abstract: | The electrical resistivity (ER) of Flexinol nickel-titanium shape memory alloys (SMA) has been measured in the range from −15 to 105°C. The investigated Flexinol wires have two diameters, 150 and 375 μm. 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°C] the hysteresis is almost negligible, whereas in the range [−15 to 105°C] the accommodation process of the hysteresis is observed. |
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| Keywords: | electrical resistivity Flexinol hysteresis phase transformation shape memory alloy (SMA) temperature |
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