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<p>Metastable <i>β</i> titanium alloy is an ideal material for lightweight and high strength due to its excellent comprehensive mechanical properties. However, overcoming the trade-off relation between strength and ductility remains a significant challenge. In this study, the mechanical properties of Ti-38644 alloy were optimized by introducing a heterogeneous bi-grain bi-lamella (BG-BL) structure through a well-designed combination of rolling, drawing and heat treatment. The results demonstrate that the present BG-BL Ti-38644 alloy shows a tensile strength of ~ 1500&#xa0;MPa and a total elongation of 18%. In particular, the high strength-elongation combination of the BG-BL Ti-38644 alloy breakthroughs the trade-off relation in all the titanium alloys available. The recrystallized grains with low dislocation enhance the ductility of the Ti-38644 alloy, while the highly distorted elongated grains mainly contribute to the high strength. The present study provides a new principle for designing Ti alloys with superior strength and ductility.</p>

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Breaking Strength-Ductility Trade-off Relation in Ti-38644 Alloy with Heterogeneous Bi-Grain Bi-Lamella Structure

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年5月30日

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  • Zihao Qiu,
  • Chenwei Shao,
  • Shuaijie Han,
  • Yang Lu,
  • Zhiqin Wang,
  • Hanzhong Liu,
  • Zhenjun Zhang,
  • Zhefeng Zhang

摘要

Metastable β titanium alloy is an ideal material for lightweight and high strength due to its excellent comprehensive mechanical properties. However, overcoming the trade-off relation between strength and ductility remains a significant challenge. In this study, the mechanical properties of Ti-38644 alloy were optimized by introducing a heterogeneous bi-grain bi-lamella (BG-BL) structure through a well-designed combination of rolling, drawing and heat treatment. The results demonstrate that the present BG-BL Ti-38644 alloy shows a tensile strength of ~ 1500 MPa and a total elongation of 18%. In particular, the high strength-elongation combination of the BG-BL Ti-38644 alloy breakthroughs the trade-off relation in all the titanium alloys available. The recrystallized grains with low dislocation enhance the ductility of the Ti-38644 alloy, while the highly distorted elongated grains mainly contribute to the high strength. The present study provides a new principle for designing Ti alloys with superior strength and ductility.