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<p>To predict the microstructure and damage behavior evolution of the Ti-24Nb-4Zr-8Sn alloy during tensile deformation at different grain sizes, a multiscale model coupling phase-field damage and crystal plasticity was developed in this study. The tensile test was conducted on Ti-24Nb-4Zr-8Sn alloy, and the microstructure of the undeformed bar was measured by electron backscatter diffraction (EBSD). A representative volume element (RVE) was constructed based on the obtained EBSD information, and the deformation behavior, dislocation density, and damage evolution of the Ti-24Nb-4Zr-8Sn alloy with different grain sizes were investigated. The study reveals the variation of material properties with grain size. The tensile strength increases by 27% when the grain size is refined from 35&#xa0;µm to 2&#xa0;µm, and the von Mises stress, strain, and damage distribution is more uniform at small grain sizes. Furthermore, the dislocation density of the various slip systems gradually increases as the grain size decreases. However, the dislocation density of the {112} &lt; 111 &gt; slip system grows more rapidly and reaches a larger value, indicating that this slip system dominates during the tensile process. The study provides theoretical support for improving the performance of medical titanium alloys and researching their deformation mechanism.</p>

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Effect of grain size on the deformation behavior and damage evolution of Ti-24Nb-4Zr-8Sn alloy

  • 期刊论文

  • 发表日期：

    2025年7月10日

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  • Xiaoyun Zhang,
  • Fang Cao,
  • Jianting Li,
  • Ruotian Wang,
  • Wei-Feng Rao

摘要

To predict the microstructure and damage behavior evolution of the Ti-24Nb-4Zr-8Sn alloy during tensile deformation at different grain sizes, a multiscale model coupling phase-field damage and crystal plasticity was developed in this study. The tensile test was conducted on Ti-24Nb-4Zr-8Sn alloy, and the microstructure of the undeformed bar was measured by electron backscatter diffraction (EBSD). A representative volume element (RVE) was constructed based on the obtained EBSD information, and the deformation behavior, dislocation density, and damage evolution of the Ti-24Nb-4Zr-8Sn alloy with different grain sizes were investigated. The study reveals the variation of material properties with grain size. The tensile strength increases by 27% when the grain size is refined from 35 µm to 2 µm, and the von Mises stress, strain, and damage distribution is more uniform at small grain sizes. Furthermore, the dislocation density of the various slip systems gradually increases as the grain size decreases. However, the dislocation density of the {112} < 111 > slip system grows more rapidly and reaches a larger value, indicating that this slip system dominates during the tensile process. The study provides theoretical support for improving the performance of medical titanium alloys and researching their deformation mechanism.