Влияние термомеханических обработок на эволюцию микроструктуры и деформационное поведение сплава на основе никелида титана при квазистатическом и циклическом изгибе

We have investigated the influence of severe plastic deformation and isothermal annealing on the formation of dislocation substructures in a TiNi-based alloy with martensitic transformation. It is shown that a peculiarity of the investigated alloy is a high scalar dislocation density which is preserved up to 1073 K. The dislocation density decreases only as the result of thermal treatment at temperature 1373 K. It is established that changes in the microstructure lead to a change in the rate of residual strain accumulation under quasi-static and cyclic loading. On the basis of experimental data it is assumed that dislocation and martensitic mechanisms of deformation are possible.