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<p>Using the method of active tension, the short-term strength and plasticity characteristics are determined for vanadium and its alloy in a&#xa0;low-temperature region. The peculiarities of neck formation and material fracture are studied as a&#xa0;function of the tension temperature and the initial structural-phase state. It is found out that the vanadium specimens demonstrate V‑shaped fracture profiles and a&#xa0;rough relief along the grain boundaries on the lateral surfaces. Irrespective of the mode of thermomechanical treatment of the V–Ta–Cr–Zr alloy, there are strain localization regions formed at all of the tensile test temperatures, which measure a&#xa0;few hundred micrometers along the axis of tension. It is observed that prior to the neck formation the strain localization becomes more rapid. It is shown that the plastic deformation and fracture of the V–Ta–Cr–Zr alloy at cryogenic temperatures do not depend on its structural-phase state. It is hypothesized that the grain size and the polygonal state act together as the decisive factors in the processes of strain localization and neck formation under the tensile conditions at the temperatures of −50&#xa0;and −100 °C.</p>

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Plastic deformation and fracture of vanadium and V–Ta–Cr–Zr alloy under suppressed diffusion and dislocation activity

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • I. A. Ditenberg,
  • K. V. Grinyaev,
  • I. V. Smirnov,
  • D. A. Osipov

摘要

Using the method of active tension, the short-term strength and plasticity characteristics are determined for vanadium and its alloy in a low-temperature region. The peculiarities of neck formation and material fracture are studied as a function of the tension temperature and the initial structural-phase state. It is found out that the vanadium specimens demonstrate V‑shaped fracture profiles and a rough relief along the grain boundaries on the lateral surfaces. Irrespective of the mode of thermomechanical treatment of the V–Ta–Cr–Zr alloy, there are strain localization regions formed at all of the tensile test temperatures, which measure a few hundred micrometers along the axis of tension. It is observed that prior to the neck formation the strain localization becomes more rapid. It is shown that the plastic deformation and fracture of the V–Ta–Cr–Zr alloy at cryogenic temperatures do not depend on its structural-phase state. It is hypothesized that the grain size and the polygonal state act together as the decisive factors in the processes of strain localization and neck formation under the tensile conditions at the temperatures of −50 and −100 °C.