Abstract
Development and stability of the intrinsic two-way shape memory effect on three alloys with different microstructure are studied in this work. Wire specimens of a binary NiTi alloy, a CuAlNi alloy and finally a shape memory alloy with W-dispersoids in a NiTi matrix are investigated. After a training procedure the samples are subjected to 4000 two-way cycles. Changes in deformation behavior are discussed. Whereas the influence of work hardening on the magnitude and stability of the effect should be aim of the work with the binary alloy, results of different grain size are investigated in the CuAlNi alloy. The NiTiW alloy should deliver information about the effect of internal stress fields caused by the W-dispersoids on fatigue behavior. It is shown in this work that quite good stability of the two-way effect can be achieved by optimizing the microstructure. Certainly it must be admitted that any measure to improve the stability reduces the magnitude of the effect. Consequently an appropriate compromise has to be realized by combining a suitable microstructure and thermal treatment.
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