Effect of chemical composition and heat treatment on the shape memory parameters in the TiNi-Me alloys

Abstract

The TiNi-Me shape memory alloy parameters (namely, phase transformation "strength yield", recoverable strain, reversion stress, material hardness) have been investigated as a function of the chemical composition, heat treatment regimes and deformation condition. These parameters are found to be structurally sensitive ones both to the macroscopic and microscopic structure of the material. Their response to heat treatment regimes is usually non-homogeneous function of the aging temperature and time variation. Effects of doping and secondary particle precipitation are of great importance. Some recommendations for the choice of the SMA chemical composition and final heat treatment regime can be proposed.