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<p>The trade-off between strength and ductility remains a significant challenge in titanium alloy development. Microstructural engineering is a cost-effective alternative to balance strength and ductility. In this study, three microstructures were produced in low-cost titanium alloys via solution treatment, and the alloys with α, α′-martensite, and β phases exhibited an optimal strength–ductility combination. The hierarchical phase structure, α′-martensite reorientation, multi-oriented nanotwins, and dislocation interactions collectively contributed to its high yield strength (~ 1015&#xa0;MPa), ultimate tensile strength (~ 1307&#xa0;MPa), and satisfactory ductility (~ 13%). Importantly, this study reveals a new pathway for nanotwin formation in α′ phases and provides key insights for optimizing the mechanical properties of low-cost titanium alloys.</p> Graphical abstract <p></p>

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Achieving excellent strength plasticity matching in low-cost titanium alloy via nano-twinning and hierarchical phase structure

  • 期刊论文

  • 发表日期：

    2025年8月3日

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  • Zhong-Li Qiao,
  • Qin-Yang Zhao,
  • Zi-Xuan Meng,
  • Ping Guo,
  • Run-Qi Zhang,
  • Huan Wang,
  • Cheng Lin,
  • Kuai-She Wang,
  • Yong-Qing Zhao

摘要

The trade-off between strength and ductility remains a significant challenge in titanium alloy development. Microstructural engineering is a cost-effective alternative to balance strength and ductility. In this study, three microstructures were produced in low-cost titanium alloys via solution treatment, and the alloys with α, α′-martensite, and β phases exhibited an optimal strength–ductility combination. The hierarchical phase structure, α′-martensite reorientation, multi-oriented nanotwins, and dislocation interactions collectively contributed to its high yield strength (~ 1015 MPa), ultimate tensile strength (~ 1307 MPa), and satisfactory ductility (~ 13%). Importantly, this study reveals a new pathway for nanotwin formation in α′ phases and provides key insights for optimizing the mechanical properties of low-cost titanium alloys.

Graphical abstract