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<p>The phase fractions (α/β) and residual stresses in a novel ultrahigh-strength metastable β-Ti alloy, Ti-6.5Mo-2.5Cr-2V-2Nb-1Sn-1Zr-4Al, were investigated by x-ray diffraction (XRD) measurement and analysis in this work. The phase fractions were quantitatively analyzed using the XRD Rietveld refinement method without requiring standard reference samples. The measured α and β phases account for 24.24% and 75.76%, respectively. The x-ray stress constant of β (321) is determined utilizing four-point bending loading, strain gauge monitoring, and in situ x-ray diffraction, yielding − 273.9MPa/°. The test results indicate that there is a compressive stress of − 271.9 MPa in the α-phase, while the tensile stress of 157.2 MPa is present in the β-phase. Based on the phase fractions and the interaction between the two phases, the macro-residual stress of the specimen is calculated to be 53.2 MPa. The relatively low residual stress (53.2 MPa) obtained in the studied alloy after solution treatment and annealing without cold working corresponds to a near stress-free state, which aligns with the thermomechanical processing history. This study provides the stress constants, constructs a testing platform, and overcomes a key obstacle in residual stress characterization for dual-phase Ti alloys, thereby providing a scientific basis for anti-fatigue design strategies of this novel alloy system.</p>

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Residual Stresses in a Novel Dual-Phase Ti-6.5Mo-2.5Cr-2V-2Nb-1Sn-1Zr-4Al Alloy

  • 期刊论文

  • 发表日期：

    2025年12月13日

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  • Yuewei Wang,
  • Haoxin Wang,
  • Yirou Jiang,
  • Haozhe Li,
  • Zhihao Ma,
  • Yuxi Feng,
  • Zhengxin Shi,
  • Ma Zhang,
  • Hui Zhang,
  • Wangfeng Zhang

摘要

The phase fractions (α/β) and residual stresses in a novel ultrahigh-strength metastable β-Ti alloy, Ti-6.5Mo-2.5Cr-2V-2Nb-1Sn-1Zr-4Al, were investigated by x-ray diffraction (XRD) measurement and analysis in this work. The phase fractions were quantitatively analyzed using the XRD Rietveld refinement method without requiring standard reference samples. The measured α and β phases account for 24.24% and 75.76%, respectively. The x-ray stress constant of β (321) is determined utilizing four-point bending loading, strain gauge monitoring, and in situ x-ray diffraction, yielding − 273.9MPa/°. The test results indicate that there is a compressive stress of − 271.9 MPa in the α-phase, while the tensile stress of 157.2 MPa is present in the β-phase. Based on the phase fractions and the interaction between the two phases, the macro-residual stress of the specimen is calculated to be 53.2 MPa. The relatively low residual stress (53.2 MPa) obtained in the studied alloy after solution treatment and annealing without cold working corresponds to a near stress-free state, which aligns with the thermomechanical processing history. This study provides the stress constants, constructs a testing platform, and overcomes a key obstacle in residual stress characterization for dual-phase Ti alloys, thereby providing a scientific basis for anti-fatigue design strategies of this novel alloy system.