The effect of non-conventional electrical pulse treatment on microstructure and shape memory response of Ni49Ti51 wires was studied. High-power rapid current square pulses were applied to cold-drawn wires of 25 lm diameter. The TEM microstructures showed equiaxial recrystallization, with average grain size in the 100 nm range, after a double current pulse lasting 10 ms. Rapid current pulse treatment in Ti-rich NiTi induces shape memory effect with reduced thermal hysteresis and high recovery strain values. This novel treatment might replace conventional pre-device shape setting/training of the wire with a post-device shape setting with promising industrial advantages.

Electrical Pulse Shape Setting of Thin Ni49Ti51 Wires for Shape Memory Actuators / R., Casati; M., Vedani; Gialanella, Stefano; A., Tuissi. - In: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE. - ISSN 1059-9495. - ELETTRONICO. - 23:(2014), pp. 2487-2490. [10.1007/s11665-014-0999-3]

Electrical Pulse Shape Setting of Thin Ni49Ti51 Wires for Shape Memory Actuators

Gialanella, Stefano;
2014

Abstract

The effect of non-conventional electrical pulse treatment on microstructure and shape memory response of Ni49Ti51 wires was studied. High-power rapid current square pulses were applied to cold-drawn wires of 25 lm diameter. The TEM microstructures showed equiaxial recrystallization, with average grain size in the 100 nm range, after a double current pulse lasting 10 ms. Rapid current pulse treatment in Ti-rich NiTi induces shape memory effect with reduced thermal hysteresis and high recovery strain values. This novel treatment might replace conventional pre-device shape setting/training of the wire with a post-device shape setting with promising industrial advantages.
R., Casati; M., Vedani; Gialanella, Stefano; A., Tuissi
Electrical Pulse Shape Setting of Thin Ni49Ti51 Wires for Shape Memory Actuators / R., Casati; M., Vedani; Gialanella, Stefano; A., Tuissi. - In: JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE. - ISSN 1059-9495. - ELETTRONICO. - 23:(2014), pp. 2487-2490. [10.1007/s11665-014-0999-3]
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11572/100388
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