INVESTIGATION OF REACTIVE STRESSES IN AN ALLOY TI50NI40CU10

10.25712/ASTU.1811-1416.2022.02.010

Abstract

The study of the mechanical properties of titanium nickelide-based materials arising during thermoelastic martensitic transformations, including reactive stresses, is of great interest. The effect of generating reactive stresses in materials with shape memory has an impact on various fields of technology. Thus, in materials with the shape memory effect, acting as mechanical energy converters and as power elements of drives, the conditions under which the deformation is fixed are used. This use assumes stability of properties and operating parameters in this type of devices. In this work, reactive stresses arising in titanium nickelide-based alloy samples during the fixation of deformation, which prevents the implementation of the shape memory effect during the cycling of martensitic transformations, were investigated. It is assumed that cycling of martensitic transformations can lead to changes in reactive stresses due to structural adjustment of the material, which in turn will affect the performance characteristics of components and assemblies made of titanium nickelide-based alloys. It is shown that the level of reactive stresses developed in the sample in the heating-cooling cycle decreases in subsequent cycles. The observed hardening from cycle to cycle, under the action of reactive stresses, can characterize the phenomenon of phase hardening.