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<p>In this study, a Ti-5V4Mo2Cr1Fe2Zr3Al (wt.%) metastable <i>β</i>-type titanium alloy is designed using parameters such as molybdenum equivalent ([Mo]eq) and <i>Bo-Md</i>. The homogenized ingot is hot-rolled and then subjected to a cold rolling process interspersed with annealing. The EBSD results reveal that the microstructure of the annealed alloy consisted of extremely fine single BCC grains, EBSD-based kernel average misorientation, and geometrically necessary dislocation maps indicate a uniform distribution of dislocations in <i>β</i> grains after annealing. This annealed alloy exhibits high strength and good plasticity, with a yield strength of 720&#xa0;MPa and a fracture elongation of 32%. Moreover, after aging at 500 °C for 24&#xa0;h, the alloy forms uniform and fine α precipitates within the <i>β</i> grains. This aged alloy exhibits a high yield strength of 1410&#xa0;MPa and a fracture elongation of 6%. The yield strength of the alloy is calculated using different strengthening models, and the results are consistent with the experimental findings.</p>

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Ti-VMoCrFeZrAl β-Type Titanium Alloy with High Strength Obtained by Composition Design and Cold Rolling with Heat Treatment

  • 期刊论文

  • 发表日期：

    2025年4月25日

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  • Jisheng Zhang,
  • Enda Gao,
  • Zhengbo Wang,
  • Siqi Pan

摘要

In this study, a Ti-5V4Mo2Cr1Fe2Zr3Al (wt.%) metastable β-type titanium alloy is designed using parameters such as molybdenum equivalent ([Mo]eq) and Bo-Md. The homogenized ingot is hot-rolled and then subjected to a cold rolling process interspersed with annealing. The EBSD results reveal that the microstructure of the annealed alloy consisted of extremely fine single BCC grains, EBSD-based kernel average misorientation, and geometrically necessary dislocation maps indicate a uniform distribution of dislocations in β grains after annealing. This annealed alloy exhibits high strength and good plasticity, with a yield strength of 720 MPa and a fracture elongation of 32%. Moreover, after aging at 500 °C for 24 h, the alloy forms uniform and fine α precipitates within the β grains. This aged alloy exhibits a high yield strength of 1410 MPa and a fracture elongation of 6%. The yield strength of the alloy is calculated using different strengthening models, and the results are consistent with the experimental findings.