Abstract
The Ni-50.2Ti alloy was severely plastically deformed by differential speed rolling with high speed ratios in range of 2–4.2. The maximum recovery and residual recovery stresses, which are important for applications in civil engineering, were improved after rolling. This result was attributed to the significant increase in the strength of the martensite phase and the large decrease in martensitic transformation finish temperature (Mf) by microstructural refinement. Post-deformation annealing at 673K deteriorated the shape memory properties, which was attributed to the formation of a martensitic R-phase in the alloy and an increase in the Mf temperature.
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