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Volume 38 Issue 1
Feb 2024
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Chinese Journal of High Pressure Physics  > 2024  >  38(1): 014101.
YANG Dong, JIANG Ziwei, ZHENG Zhijun. Dynamic Behavior and Constitutive Relationship of Titanium Alloy Ti6Al4V under High Temperature and High Strain Rate[J]. Chinese Journal of High Pressure Physics, 2024, 38(1): 014101. doi: 10.11858/gywlxb.20230743
Citation: YANG Dong, JIANG Ziwei, ZHENG Zhijun. Dynamic Behavior and Constitutive Relationship of Titanium Alloy Ti6Al4V under High Temperature and High Strain Rate[J]. Chinese Journal of High Pressure Physics, 2024, 38(1): 014101. doi: 10.11858/gywlxb.20230743
shu

Dynamic Behavior and Constitutive Relationship of Titanium Alloy Ti6Al4V under High Temperature and High Strain Rate

doi: 10.11858/gywlxb.20230743
  • 1.

    Department of Mechanical Engineering, Anhui University, Hefei 230601, Anhui, China

  • 2.

    CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei 230026, Anhui, China

  • Received Date: 27 Sep 2023
  • Rev Recd Date: 12 Oct 2023
    • Available Online: 19 Dec 2023
  • Issue Publish Date: 05 Feb 2024
    Abstract
  • The dynamic mechanical behavior and microstructure evolution of titanium alloy Ti6Al4V under shock compression at temperatures ranging from 25 ℃ to 800 ℃ and strain rates from 2000 s−1 to 7000 s−1 were studied by using a split Hopkinson pressure bar. The temperature dependence and strain rate sensitivity of the material’s mechanical response were analyzed, and a modified Johnson-Cook model that could accurately characterize the plastic flow behavior of the material was developed. The results show that Ti6Al4V exhibited significant strain hardening, strain rate strengthening, strain rate plasticity, and temperature softening effects. With increasing loading temperature and strain rate, the material’s strain hardening effect is weakened. The temperature sensitivity is significantly decreased with increasing loading temperature. The strain rate sensitivity factor is negatively correlated with the loading temperature, and it shows a downward trend as the true strain increased. At high temperatures and high strain rates, fine equiaxial α phase, elongated α phase, and massive α phase replace the initial equiaxial α phase as the typical microstructure features of Ti6Al4V. The modified Johnson-Cook model that considers the effect of rate-temperature coupling and adiabatic temperature rise can accurately predict the plastic flow stress-strain response of Ti6Al4V.

     

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