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<p>A tri-modal microstructure consisting of equiaxed α phase, acicular α phase and β transformed matrix was achieved in TA15 titanium alloy processed by hot rolling and short-time annealing in this work. The mechanical properties and strengthening mechanisms of TA15 titanium alloy with a tri-modal microstructure were investigated. During the annealing treatment, the volume fraction of acicular α phase decreased gradually with increasing the annealing temperature. Furthermore, with the increase in annealing time, the volume fraction of α phase increased. When the hot-rolled TA15 titanium alloy was annealed at 750&#xa0;°C for 30&#xa0;min, a tri-modal microstructure consisting of equiaxed α phase (9.63%/4.56&#xa0;μm), acicular α phase (70.21%/0.22&#xa0;μm), and β transformed matrix (20.16%) was obtained. The yield strength, ultimate tensile strength, and elongation of the alloy after annealing at 750&#xa0;°C for 30&#xa0;min were 982.8&#xa0;MPa, 1096.5&#xa0;MPa, and 11.72%, respectively. The highest strength–ductility product (12,851&#xa0;MPa%) was obtained for the alloy annealed at 750&#xa0;°C for 30&#xa0;min, which exhibited an extraordinary strength–ductility synchronization.</p>

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Achieving an Extraordinary Strength–Ductility Synchronization in TA15 Titanium Alloy via Tailoring a Tri-modal Microstructure

  • 期刊论文

  • 发表日期：

    2025年10月25日

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  • Qi-Mei Tian,
  • Fu Xiao,
  • Ya Yang,
  • Yuan-Biao Tan,
  • Song Xiang,
  • Xuan-Ming Ji,
  • Fei Zhao,
  • Hui Yang

摘要

A tri-modal microstructure consisting of equiaxed α phase, acicular α phase and β transformed matrix was achieved in TA15 titanium alloy processed by hot rolling and short-time annealing in this work. The mechanical properties and strengthening mechanisms of TA15 titanium alloy with a tri-modal microstructure were investigated. During the annealing treatment, the volume fraction of acicular α phase decreased gradually with increasing the annealing temperature. Furthermore, with the increase in annealing time, the volume fraction of α phase increased. When the hot-rolled TA15 titanium alloy was annealed at 750 °C for 30 min, a tri-modal microstructure consisting of equiaxed α phase (9.63%/4.56 μm), acicular α phase (70.21%/0.22 μm), and β transformed matrix (20.16%) was obtained. The yield strength, ultimate tensile strength, and elongation of the alloy after annealing at 750 °C for 30 min were 982.8 MPa, 1096.5 MPa, and 11.72%, respectively. The highest strength–ductility product (12,851 MPa%) was obtained for the alloy annealed at 750 °C for 30 min, which exhibited an extraordinary strength–ductility synchronization.