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<p>Four Ti–V-based β-type alloys exhibiting twinning-induced plasticity (TWIP) effect, —Ti–22.0&#xa0;V, Ti–19.4&#xa0;V–4.2Nb, Ti–15.0&#xa0;V–3.9Nb–1.0Fe, and Ti–15.5&#xa0;V–4.0Nb–1.0Fe–1.1Al (wt%)—were designed using the specific orientation moduli (SOM) method. The designed alloys had <i>E</i><sub>100</sub>, <i>G</i><sub>111</sub>, and <i>C′</i> values of 22.8, 10.6, and 7.8 GPa, respectively. Thermal-induced metastable phases were ω-phases with trigonal structures, while stress-induced deformation modes were dominated by {332} &lt; 113 &gt;<sub>β</sub> twinning. Under tensile loading, all alloys exhibited the TWIP effect, characterized by high uniform elongation and pronounced strain hardening. Compared to binary and ternary counterparts, the quaternary and quinary alloys showed enhanced strength and ductility. Their higher yield strengths were attributed to solid solution strengthening by Fe and Al and dispersion strengthening from the ω-phase. The presence of dense {332} &lt; 113 &gt;<sub>β</sub> twins contributed to a dynamic Hall–Petch effect and back stress hardening, resulting in larger uniform elongations. These results confirm the rationality and broad applicability of the SOM method in the design of Ti–V-based alloys.</p>

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Design of Ti–V-based TWIP alloys via specific orientation moduli method

  • 期刊论文

  • 发表日期：

    2025年9月2日

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  • Yulong Jiang,
  • Xiaohua Min,
  • Mingyuan Lv

摘要

Four Ti–V-based β-type alloys exhibiting twinning-induced plasticity (TWIP) effect, —Ti–22.0 V, Ti–19.4 V–4.2Nb, Ti–15.0 V–3.9Nb–1.0Fe, and Ti–15.5 V–4.0Nb–1.0Fe–1.1Al (wt%)—were designed using the specific orientation moduli (SOM) method. The designed alloys had E100, G111, and C′ values of 22.8, 10.6, and 7.8 GPa, respectively. Thermal-induced metastable phases were ω-phases with trigonal structures, while stress-induced deformation modes were dominated by {332} < 113 >β twinning. Under tensile loading, all alloys exhibited the TWIP effect, characterized by high uniform elongation and pronounced strain hardening. Compared to binary and ternary counterparts, the quaternary and quinary alloys showed enhanced strength and ductility. Their higher yield strengths were attributed to solid solution strengthening by Fe and Al and dispersion strengthening from the ω-phase. The presence of dense {332} < 113 >β twins contributed to a dynamic Hall–Petch effect and back stress hardening, resulting in larger uniform elongations. These results confirm the rationality and broad applicability of the SOM method in the design of Ti–V-based alloys.