Research Progress of Effect of Heat Treatment on Microstructure, Phase Transformation Behaviors and Memory Properties in Ti-Ni Based Shape Memory Alloys

Abstract

Ti-Ni based shape memory alloys (SMAs) are of excellent shape memory effect, superelasticity and damping property. These properties of the alloys can be fully displayed only after proper heat treatment. In this paper, the research progresses of the effect of the heat treatment on the microstructure, phase composition, phase transformation behaviors and shape memory properties in Ti-Ni based SMAs are reviewed, the correlation influence mechanism is summarized, and the future research directions in this field are pointed out. It is expected to provide reference for the development of Ti-Ni based SMAs and their heat treatment technologies.

Compressive Mechanics and Hyperelasticity of Ni-Ti Lattice Structures Fabricated by Selective Laser Melting

“…At the same time, after a certain cycle period, the unrecoverable strain of the lattice structure tended to be stable, showing stable hyperelasticity. In addition, with the increase of the cyclic strain value, the unrecoverable strain gradually rose due to the formation of lattice defects in the Ni-Ti material under the action of large strain, which, in turn, hindered the phase transformation of martensite [46].…”