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<p>A modified thermomechanical treatment was applied to produce Ti-18Zr-15Nb alloy rods (Ø5.5&#xa0;mm) for transpedicular spinal fixation, employing a four-caliber three-roll longitudinal rolling scheme followed by hot tension straightening. The resulting microstructure exhibited a mixed recrystallized and polygonized <i>β</i>-phase substructure. As a result of recrystallization in the peripheral zones, a local &lt; 001 &gt; texture was formed, while the central zone retained the favorable &lt; 011 &gt; orientation. Mechanical testing revealed nonlinear stress–strain response, attributed to crystallographic and structural anisotropy. Functional testing showed a superelastic recovery strain of 2.7% at room temperature, which increased to 3.9% at 0&#xa0;°C, consistent with a decrease in martensitic transformation temperatures due to elevated Zr (+ 0.6%) and Nb (+ 0.2%) content. TEM revealed the presence of the α-phase, likely caused by slow air cooling after processing. These results confirm the potential of the developed thermomechanical route for manufacturing high-performance Ti-based alloy rods for orthopedic applications.</p>

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Effect of a Four-Caliber Longitudinal Rolling on Microstructure, Mechanical, and Functional Properties of Superelastic Ti–Zr–Nb Alloy for Biomedical Application

  • 期刊论文

  • 发表日期：

    2025年8月13日

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  • K. Lukashevisch,
  • E. Aleksandrovskiy,
  • K. Vasilyev,
  • R. Komarov,
  • A. Baranova,
  • D. Ten,
  • S. Prokoshkin,
  • V. Sheremetyev

摘要

A modified thermomechanical treatment was applied to produce Ti-18Zr-15Nb alloy rods (Ø5.5 mm) for transpedicular spinal fixation, employing a four-caliber three-roll longitudinal rolling scheme followed by hot tension straightening. The resulting microstructure exhibited a mixed recrystallized and polygonized β-phase substructure. As a result of recrystallization in the peripheral zones, a local < 001 > texture was formed, while the central zone retained the favorable < 011 > orientation. Mechanical testing revealed nonlinear stress–strain response, attributed to crystallographic and structural anisotropy. Functional testing showed a superelastic recovery strain of 2.7% at room temperature, which increased to 3.9% at 0 °C, consistent with a decrease in martensitic transformation temperatures due to elevated Zr (+ 0.6%) and Nb (+ 0.2%) content. TEM revealed the presence of the α-phase, likely caused by slow air cooling after processing. These results confirm the potential of the developed thermomechanical route for manufacturing high-performance Ti-based alloy rods for orthopedic applications.