Конференції
  1. Головна
  2. Структура
  3. Фізичне матеріалознавство та фізика міцності
  4. Публікація

Abnormal superelasticity of intermetallic Ti3Sn: a brief overview

Ю.М.Подрезов*,
 
М.В.Буланова,
 
О.В.Вдовиченко,
 
Ю.В.Фартушна
 

Інститут проблем матеріалознавства ім. І. М. Францевича НАН України , Київ
yupodrezov@ukr.net
Usp. materialozn. 2025, 10/11:13-26
https://doi.org/10.15407/materials/-

Анотація

In recent years, intensive research has been conducted to development materials with biocompatible mechanical behavior for use in transplantology. Particular attention is paid to the improvement of β- and α+β titanium alloys alloyed with other metals. However, a literature review has shown that a characteristic feature of biological tissues is a J-shaped load curve, while most superelastic metallic materials have S-shaped load curve. In addition, known titanium alloys have elastic characteristics higher than those of bone tissue. The review presents results that demonstrate that the Ti3Sn-based alloys developed by the authors are an exception, exhibiting unusual mechanical behavior, namely a J-shaped load curve. In addition, unlike known titanium alloys, Ti3Sn-based alloys have elastic characteristics close to those of biological tissues. Depending on the composition and microstructure, their elastic modulus varies in the range of 4-40 GPa. This behavior was established for the binary intermetallic Ti75,5Sn24,5 and alloys based on it, doped with Zr, Al, and Dy. The lowest value of 4 GPa is demonstrated by the intermetallic Ti75,5Sn24,5. The presented results are confirmed by quasi-static bending, compression and tensile tests, as well as by methods of dynamic mechanical analysis and resonant ultrasonic spectroscopy, which demonstrates the reproducibility of the effect. A decrease in the apparent modulus of elasticity with increasing load was also found, which, however, was completely reversible. The physical reasons for this behavior are phase-structural rearrangements during deformation, associated with the martensitic transformation from the hexagonal P63/mmc to the orthorhombic Cmcm phase, which has a twinned self-accommodated microstructure. The direction of future research is determined.

Keywords: intermetallics, mechanical behavior, elasticity.


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