Abstract
Functional properties (FP) of Ti–50.7 at%Ni alloy with various types of structure in a wide range of grain/subgrain size have been examined. The shape memory effect (SME) training procedure was carried out in bending under load via R→B19 transformation; the total strain εt of external layer varied from 12 to 20%. The maximum total recovery strain εrtot= 15.5± 0.5% in Ti−50.7%Ni alloy is realized after low-temperature thermomecanical treatment (e = 0.6) in two cases: (1) recrystallized structure with the grain size 5.5-11.5 μm obtained as a result of post-deformation annealing (PDA) at 600-700 °C, and (2) mixed nanocrystalline structure + nanosubgrained sustructure with the grain/subgrain size of 90 nm obtained as a result of PDA at 430 °C, 10 h. The results of a comparative study of the structure and substructure formation depended on PDA is presented. The regularities of FP changes in various structural states are analyzed.
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