Abstract
This study investigates the effects of aging on the shape memory and superelasticity behavior of a Ni-rich Ni54Ti46 (at%) alloy. Differential scanning calorimetry (DSC), X-ray diffraction (XRD), transmission electron microscopy (TEM) and compression test (thermal cycling under stress and superelasticity) were carried out after 3h agin;g from 450°C to 600°C. The alloys show recoverable shape memory effect with transformation strains of about 1% and narrow hysteresis under high stress levels. The work output of 14.1 Jg−1 was observed at an ultra-high stress level of 1500MPa after 600°C 3h aging. 450°C 3h aging resulted in a very narrow temperature hysteresis of 8°C under an ultra-high stress level of 1500MPa. At room temperature, the superelastic response with 4% total strain was obtained even when high stress level of 2000MPa is applied after 550°C 3h aging.
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