Effect of the Size Factor on the Strength and Plastic Properties, the Shape Memory Effect, and the Superelasticity of TiNi-Based Thin Filaments

The strength and plastic properties and the shape memory effect and superelasticity parameters of thin (30–90 μm in diameter) TiNi-based filaments have been investigated. The strength properties of the filaments are found to increase when the filament diameter decreases from 90 to 30 μm, and the plastic properties decrease in this case. The parameters of the two-way shape memory effect of the ultrathin nickel–titanium filaments depend on the size factor. The thin TiNi-based filaments are shown to exhibit high superelastic properties, and the maximum superelasticity temperature depends on the size factor.