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<p>To improve the yield strength of metastable β-Ti alloys with transformation-induced plasticity (TRIP) and twinning-induced plasticity effects, a novel strategy combining heterostructure strengthening with the TRIP effect was developed. A metastable β-Ti alloy with a nominal composition of Ti–4Mo–3Cr–1Fe–1Al was used as the base alloy. By adjusting the annealing temperature after cold rolling, heterostructured samples comprising soft recrystallized β-grains and hard un-recrystallized β-grains and α-phase were prepared. Compared with the homogeneous coarse-grained sample, the yield strength of the heterostructured sample significantly increased from 610 to 905&#xa0;MPa, while maintaining excellent plasticity (32.7%), overcoming the traditional trade-off between strength and ductility. The observed high yield strength is attributed to significant back-stress strengthening caused by the accumulation of a large number of geometrically necessary dislocations at the interfaces between the soft and hard regions. Meanwhile, the exceptional plasticity is attributed to the activation of stress-induced martensite (SIM) within the metastable β matrix. The sequential activation of dislocation slips and SIM is achieved through the construction of a heterostructured structure. This work provides a new strategy for designing metastable β-Ti alloys with high strength and plasticity by coupling heterostructure strengthening and transformation-induced plasticity.</p> Graphical abstract <p></p>

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Overcoming the strength and ductility trade-off in a metastable β-Ti alloy by coupling heterostructure strengthening and transformation-induced plasticity

  • 期刊论文

  • 发表日期：

    2025年4月10日

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  • Kai-Ge Wang,
  • Yue-Yan Tian,
  • Wei-Chang Wei,
  • Chen-Bo Li,
  • Ji-Feng Yang,
  • Guang-Cheng Xiao,
  • Patrick J. Masset,
  • Jian Zhang,
  • Li-Gang Zhang,
  • Li-Bin Liu

摘要

To improve the yield strength of metastable β-Ti alloys with transformation-induced plasticity (TRIP) and twinning-induced plasticity effects, a novel strategy combining heterostructure strengthening with the TRIP effect was developed. A metastable β-Ti alloy with a nominal composition of Ti–4Mo–3Cr–1Fe–1Al was used as the base alloy. By adjusting the annealing temperature after cold rolling, heterostructured samples comprising soft recrystallized β-grains and hard un-recrystallized β-grains and α-phase were prepared. Compared with the homogeneous coarse-grained sample, the yield strength of the heterostructured sample significantly increased from 610 to 905 MPa, while maintaining excellent plasticity (32.7%), overcoming the traditional trade-off between strength and ductility. The observed high yield strength is attributed to significant back-stress strengthening caused by the accumulation of a large number of geometrically necessary dislocations at the interfaces between the soft and hard regions. Meanwhile, the exceptional plasticity is attributed to the activation of stress-induced martensite (SIM) within the metastable β matrix. The sequential activation of dislocation slips and SIM is achieved through the construction of a heterostructured structure. This work provides a new strategy for designing metastable β-Ti alloys with high strength and plasticity by coupling heterostructure strengthening and transformation-induced plasticity.

Graphical abstract