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STRUCTURE REFINEMENT OF SHAPE MEMORY ALLOYS UNDER SEVERE ELECTROPLASTIC ROLLING
Oral Presentation
Authors
Mechanical Engineering Research Institute of Russian Academy of Sciences
Abstract
It is shown that the deformability of Ti49.2Ni50.8 and Ti50.0Ni50.0 alloys rolled with electric current is considerably greater than that obtained by cold rolling. The influence of deformation with an electric current on features of the microstructure was investigated. It was demonstrated that strong structure refinement to grain size of 60-120 nm accompanies the electroplastic rolling process. At the same annealing temperature, the alloy with the initial martensitic structure has a larger grain size. These differences can probably be explained by the different recrystallization temperatures of deformed martensite and austenite. The intensity of strain hardening was compared for both alloys after electroplastic rolling (EPR). The reasons for the different behavior in the EPR process are discussed.
Keywords