Thermomechanical Treatment of TiNi Intermetallic-Based Shape Memory Alloys

Abstract:

Recent studies in the field of thermomechanical treatment (TMT) of Ti-Ni shape memory alloys are presented and discussed. The main problems of structure and phase transformations, and their effect on the Ti-Ni functional properties are stated. The structure formation and phase transformations are studied using TEM, XRD and DSC analyses, and the specific features of the nanostructures formed as a result of TMT are described. Algorithms for the calculation of the theoretical limit of recovery strain under the single-crystal and poly-crystal approaches (with and without texture) are proposed and experimentally validated for nanostructured SMA. Static functional properties (recovery strain and stress, parameters of superelasticity) and dynamic (fatigue) functional properties (multiple realization of stress-free shape memory, shape memory under stress, recovery stress generation-relaxation, superelastic mechanocycling) of the thermomechanically-treated Ti-Ni shape memory alloys are discussed in detail. The main attention is paid to the interrelations between the microstructure and the functional properties of the thermomechanically-treated Ti-Ni shape memory alloys.

• Periodical: Materials Science Foundations (Volumes 81-82)
• Pages: 260-341
• DOI: https://doi.org/10.4028/www.scientific.net/MSFo.81-82.260
• Online since: March 2015
• Authors: Sergey Prokoshkin*, Vladimir Brailovski, Karine Inaekyan, Andrey Korotitskiy, Alena Kreitcberg
• Keywords: Crystal Lattice, Functional Fatigue Properties, Functional Properties, Nanostructure, Phase Transformation, Shape Memory Alloy (SMA), Structure Formation, Thermomechanical Treatment, Titanium-Nickel Alloys

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