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The mechanical properties, shape memory effect and martensitic transformation temperatures in the TiNiFe alloys were measured. A ductility of more than 20% and shape recovery strain of 5.8% were obtained in these alloys. The shape memory effect increased with the increase of deformation and reached a maximum value appearing at 8% total strain. The pre-deformation raised significantly the reverse transformation temperatures and the hysteresis was enlarged by more than 40°C when the total strain exceeded 6%.
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Jiang et al. (2000) studied this question.