E. P. Ryklina, A. A. Chernavina, N. N. Perevoshchikova, Moscow State Institute of Steel and Alloys (Technological University), Moscow, Russia; S. Prokoshkin, Moscow Institute of Steel and Alloys, Moscow, Russia
Functional properties of shape memory Alloys are determined by an alloy structure, which is effectively regulated by thermomechanical treatment. When an as-received piece is subjected to memorizing treatment (training treatment), the row of additional factors strongly affect the final result. The critical temperatures, shape recovery strain, two-way shape memory effect (TWSME) magnitude, residual strain etc. significantly depend on external training parameters. The main of them are as follows: the strain and loading modes, loading temperature regime (phase state), load value, loading time, number of training cycles.
Actual technical and medical SME articles are functioning on bending in most cases. nevertheless, the influence of external training parameters under bending on properties was not systematically studied.
In the present paper, the joint influence of structure realized under various Low-Temperaure Thermomechanical Treatment (LTMT) regimes, including isothermal annealing (strain aging) and external training parameters affecting functional properties Ti-50.7%Ni alloy is studied. Variation of training parameters enables additional regulation of final functional properties.
The obtained results can be used for development elements, functioning in conditions of TWSME realization.
Summary: This paper focuses on the optimization of TWSME training parameters leading to maximum two-way recovery strrain.
