SOME ASPECTS OF THE PROPERTIES OF NITI SHAPE-MEMORY ALLOY

The damping capacity, tensile behaviour and the transformation charact eristics of a NiTi shape memory alloy rolled sheet as a function of an nealing conditions have been studied. Results show that both the marte nsite phase damping capacity and the stress for martensite phase reori entation are a function of annealing temperature. Attention has also b een paid to the correlation between the damping capacity of the shape memory alloy and its other properties. Experimental results show that a higher damping of the martensite phase generally corresponds to a lo wer reorientation stress in the stress-strain curve, suggesting that t he martensite phase damping capacity and the stress for martensite pha se reorientation are interrelated. This result may provide the possibi lity of predicting one shape memory property from others in the same a lloy.