CREATION OF SUBMICROCRYSTALLINE STRUCTURE AND IMPROVEMENT OF FUNCTIONAL PROPERTIES OF SHAPE MEMORY ALLOYS OF THE Ti - Ni - Fe SYSTEM WITH THE HELP OF ECAP

摘要

The structure and mechanical and functional properties of shape memory alloys of the Ti - Ni - Fe system are studied by methods of x-ray diffraction analysis, transmission electron microscopy, and mechanical and thermomechanical testing. The alloys are subjected to high-temperature thermomechanical treatment (HTMT) and equichannel angular pressing (ECAP). The tested objects are thermomechanical clutches from a Ti - Ni - Fe alloy subjected to ECAP and to control treatment (for comparison). The bearing capacity and the low-temperature stability of thermomechanical joints of such clutches were studied.