Abstract
This paper reports on a novel heat treatment method for the creation of functionallygraded near-equiatomic NiTi shape memory alloys. The method is an annealwithin a temperature gradient after cold work, thus creating a structural gradientwithin the matrix of the alloy. It is based on the principle that the transformationbehaviour and the thermomechanical properties of NiTi are sensitively dependenton the annealing temperature. For the Ti–50.2 at.% Ni alloy used, it was foundthat the gradient-anneal resulted in varying thermal transformation behaviouralong its length and a unique Lüders-type deformation behaviour with a positivestress gradient. Such behaviour provides improved controllability for actuationapplications.
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