Effect of the Size Factor on the Strength and Plastic Properties, the Shape Memory Effect, and the Superelasticity of Ti
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NCED MATERIALS AND TECHNOLOGIES
Effect of the Size Factor on the Strength and Plastic Properties, the Shape Memory Effect, and the Superelasticity of TiNi-Based Thin Filaments A. N. Monogenova, *, V. E. Gyuntera, S. G. Anikeeva, E. S. Marchenkoa, V. N. Khodorenkoa, and M. Yu. Fatyushina a
Siberian Physical-Technical Institute, Tomsk State University, Tomsk, 634045 Russia *e-mail: [email protected] Received December 3, 2019; revised January 14, 2020; accepted January 20, 2020
Abstract—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. Keywords: titanium nickelide, strength, plasticity, two-way shape memory effect, superelasticity, martensitic transformations DOI: 10.1134/S0036029520100183
INTRODUCTION Ultrathin filaments made of a titanium nickelide– based alloy are a promising implantation material. High biocompatibility with body tissues, superelasticity (SE), and shape memory effect (SME) allow the use of such filaments for solving many medical problems [1–5]. The advantages of a TiNi suture filament also include durability, the ability to visualize a state by X-ray control, and the application of an antibiotic onto the microporous surface of such filaments or tissue products made of them [6]. The knowledge of the strength and plastic properties, the deformation behavior under load, and the SE temperature range is necessary to understand the biomechanical compatibility of thin TiNi filaments with the tissues of a living organism. To study ultrathin (d = 30–90 μm) filaments is of particular importance. At present, there are no data on how the properties of titanium nickelide–based filaments change when their diameter decreases to 30 μm. Analysis of the available data shows an episodic nature of the studies of the properties of thin TiNi filaments; therefore, their results are difficult to analyze [7–14]. Hence, there is a need for a comprehensive study of the properties (strength, plasticity, SME and SE parameters) of thin TiNi filaments of various diameters made of one ingot under identical technological conditions.
The purpose of this work is to study the strength and plastic properties of ultrathin (d = 30–90 μm) titanium nickelide–based filaments in relation to the two-way SME and SE parameters. EXPERIMENTAL Thin filaments of diameter d = 30–90 μm were prepared from a TN-10 alloy rod 3.5 mm in diameter by drawing with intermediate annealing at 600–973 K. The deformation of the filaments at the last stage of drawing was 3–4%. The strength and plastic propert
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