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<p>Overcoming the inherent trade-off between strength and ductility in near-<i>α</i> titanium alloys—limited by their HCP <i>α</i>-phase dominance and restricted <i>β</i>-phase—has proven challenging. This study demonstrates a novel approach by pre-introducing high-density dislocations and twins into Ti-6Al-1.5Zr-1Mo-0.4Sn-0.2Nb-0.2Cr (wt%) near-<i>α</i> titanium alloy via hot forging at 1200 °C with a total reduction of ~ 80%. This microstructural engineering achieved two key outcomes simultaneously: (1) a high tensile strength (~&#xa0;1190 MPa) was attained mainly through grain boundary strengthening (contribution ~ 528 MPa) and dislocation strengthening (~&#xa0;242 MPa); (2) remarkable ductility (uniform elongation ~15.6%, total elongation  19.5% was preserved at this high strength level. This exceptional combination stems from the&#xa0;enhanced work-hardening capacity&#xa0;during plastic deformation, facilitated by twin-dislocation interactions. The excellent room-temperature strength and plasticity of the alloy make it have broad prospects in high-strength applications such as aerospace structural parts. In this study, the microstructure characteristics and evolution of the alloy were systematically revealed by XRD, SEM, EBSD, and TEM characterization techniques. The above findings reveal the potential of strengthening near-α titanium alloy without sacrificing plasticity by presetting high-density dislocations and twins, and provide a new design based on microstructure for realizing the strong plasticity synergy of near-α titanium alloy.</p>

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Gaining High Strength and Excellent Ductility of a Near-α Titanium Alloy via Presetting High-Density Dislocations and Twins

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Haorui Guo,
  • Yongliang Qi,
  • Hongxiang Zong,
  • Hong Guo,
  • Zhe Chu,
  • Xiangdong Ding,
  • Jun Sun

摘要

Overcoming the inherent trade-off between strength and ductility in near-α titanium alloys—limited by their HCP α-phase dominance and restricted β-phase—has proven challenging. This study demonstrates a novel approach by pre-introducing high-density dislocations and twins into Ti-6Al-1.5Zr-1Mo-0.4Sn-0.2Nb-0.2Cr (wt%) near-α titanium alloy via hot forging at 1200 °C with a total reduction of ~ 80%. This microstructural engineering achieved two key outcomes simultaneously: (1) a high tensile strength (~ 1190 MPa) was attained mainly through grain boundary strengthening (contribution ~ 528 MPa) and dislocation strengthening (~ 242 MPa); (2) remarkable ductility (uniform elongation ~15.6%, total elongation  19.5% was preserved at this high strength level. This exceptional combination stems from the enhanced work-hardening capacity during plastic deformation, facilitated by twin-dislocation interactions. The excellent room-temperature strength and plasticity of the alloy make it have broad prospects in high-strength applications such as aerospace structural parts. In this study, the microstructure characteristics and evolution of the alloy were systematically revealed by XRD, SEM, EBSD, and TEM characterization techniques. The above findings reveal the potential of strengthening near-α titanium alloy without sacrificing plasticity by presetting high-density dislocations and twins, and provide a new design based on microstructure for realizing the strong plasticity synergy of near-α titanium alloy.