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<p>Titanium and its alloys exhibit advantageous ductility and strength-to-weight ratios, which makes them suitable for use as structural materials in numerous industrial applications. The ω phase has been observed to precipitate during the aging process of titanium alloys, resulting in a loss of ductility. Here we report tensile behavior of bulk polycrystalline ω-titanium with a chemical composition of commercially pure titanium grade 4 and an average grain size of 3.4&#xa0;μm. We observed that stress-induced ω → α martensitic phase transformation occurs exclusively in the plastic regime. As plastic deformation proceeds, the volume fraction of α-phase increases. The 0.2% offset yield strength, tensile strength, and elongation to failure were determined to be 1130 ± 30&#xa0;MPa, 1220 ± 30&#xa0;MPa, and 16 ± 2%, respectively. The present study revealed transformation-induced plasticity in this material. The mechanical properties of this material with the pure titanium composition are comparable to those of a titanium alloy Ti-6Al-4&#xa0;V. The bulk polycrystalline ω-titanium can potentially be utilized for biomedical applications, such as dental implants.</p>

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High tensile strength and transformation-induced plasticity in bulk polycrystalline omega titanium

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年2月3日

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  • Norimasa Nishiyama,
  • Yoshinori Tange,
  • Takashi Sawahata,
  • Masafumi Matsushita,
  • Kazuya Tokuda,
  • Kosuke Tominaga,
  • Takashi Sekiya,
  • Koji Kuramochi,
  • Keita Sasaki,
  • Fumihiro Wakai,
  • Zenji Horita,
  • Yutaka Kobayashi,
  • Akio Fujimura

摘要

Titanium and its alloys exhibit advantageous ductility and strength-to-weight ratios, which makes them suitable for use as structural materials in numerous industrial applications. The ω phase has been observed to precipitate during the aging process of titanium alloys, resulting in a loss of ductility. Here we report tensile behavior of bulk polycrystalline ω-titanium with a chemical composition of commercially pure titanium grade 4 and an average grain size of 3.4 μm. We observed that stress-induced ω → α martensitic phase transformation occurs exclusively in the plastic regime. As plastic deformation proceeds, the volume fraction of α-phase increases. The 0.2% offset yield strength, tensile strength, and elongation to failure were determined to be 1130 ± 30 MPa, 1220 ± 30 MPa, and 16 ± 2%, respectively. The present study revealed transformation-induced plasticity in this material. The mechanical properties of this material with the pure titanium composition are comparable to those of a titanium alloy Ti-6Al-4 V. The bulk polycrystalline ω-titanium can potentially be utilized for biomedical applications, such as dental implants.