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On stability of NiTi wire during thermo-mechanical cycling

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Abstract

The use of NiTi wire as thermal actuator involves repeated thermal cycling through the transformation range under a constant or fluctuating load. The stability of the material under such conditions has been a concern for the past many years. Experimental results show that for a given alloy composition, the repetitive functional behaviour of NiTi wire is largely dependent on the processing schedule/parameters and the stress-strain regime of thermo-mechanical cycling (TMC). Among the various processing parameters, retained cold work in the material and the shape memory annealing temperature/time have significant influence. It has been shown in the present study that for a stable functional behaviour, the material needs to be tailored through judicious selection of these parameters. Study also shows that, after processing, the material requires an additional stabilization treatment for ensuring minimal variation in the repetitive functional response upon TMC.

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Correspondence to S. K. Bhaumik.

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Saikrishna, C.N., Ramaiah, K.V., Allam Prabhu, S. et al. On stability of NiTi wire during thermo-mechanical cycling. Bull Mater Sci 32, 343–352 (2009). https://doi.org/10.1007/s12034-009-0049-1

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