Abstract
The severe plastic deformation (SPD) forming ultrafinegrained (nanocrystalline or nanosubgrained) structure is one of the most effective ways to improve the functional properties of Ti – Ni-based shape memory alloys. SPD of Ti – 50.0 at. % Ni alloy was carried out for the first time using the multi-axial deformation MaxStrain module of system at 400, 370, 350, 330 °C. Kinetics of martensitic transformations were studied by DSC method, and the structure features using X-ray diffractometry and Transmission Electron Microscopy methods. Lowering of the deformation temperature from 370 to 330 °C with increasing of accumulated strain from 4.5 to 9.5 leads to a refinement of the structural elements and formation of mixed nanosubgraine and nanocrystalline structure with high dislocation density and average grain/subgrain size of 85 nm after deformation at the lowest temperature 330 °С with the highest strain.
Highlights
The severe plastic deformation (SPD) forming ultrafinegrained structure is one of the most effective ways to improve the functional properties of Ti – Ni-based shape memory alloys
Kinetics of martensitic transformations were studied by DSC method, and the structure features using X-ray diffractometry and Transmission Electron Microscopy methods
Lowering of the deformation temperature from 370 to 330 °C with increasing of accumulated strain
Summary
From 4.5 to 9.5 leads to a refinement of the structural elements and formation of mixed nanosubgraine and nanocrystalline structure with high dislocation density and average grain/subgrain size of 85 nm after deformation at the lowest temperature 330 °С with the highest strain.
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