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<p>Pure titanium materials are widely used in aircraft engines and other components due to their low density and high strength characteristics. However, their traditional casting process is complex and costly. Therefore, the microstructure evolution and the mechanism of twin growth of the 3D-printed pure titanium plate are studied through in-situ EBSD tensile testing. The results show that the main deformation modes are dislocation slip and deformation twins. With the increase of displacement, the internal slip lines of the <i>α</i> grains increase. The distance between adjacent slip lines is narrowed to accommodate the increased macro strain. The proportion of high-angle grain boundaries on the material’s surface reaches an impressive 76.3%, significantly enhancing the strength and hardness of the material. The KAM increases with the tensile displacement, and the strain at the grain boundaries exceeds that within the grains. This indicates that the tensile deformation predominantly occurs at the grain boundaries. The maximum misorientation angle between the twin and parent grain reaches 85.13°, indicating that the twin belongs to the tensile twin. When the tensile displacement reaches 400&#xa0;μm, the twins begin to emerge on the sample’s surface, and the twins expand through dislocation slip. With the increase of displacement, the slip line increases, and the twins expand. The intrinsic law of “grain boundary-regulated strength-dislocation-twinning deformation” during the tensile process of 3D-printed pure titanium plates is revealed systematically. The theoretical support at the level of micro-mechanisms is provided for optimizing its preparation process and service performance.</p>

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Microstructure Evolution and Twin Growth Analysis of the 3D-Printed Pure Titanium Based on In-Situ EBSD Tensile Testing

  • 期刊论文

  • 发表日期：

    2025年10月29日

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  • Sa Xue,
  • Zhen Zhu,
  • Jian Lan,
  • Yunjin Lai,
  • Zhenbo Zuo,
  • Shaoqiang Li,
  • Chen Wang,
  • Zhiyang He,
  • Liying Zhang,
  • Peng Zhang,
  • Benqi Jiao

摘要

Pure titanium materials are widely used in aircraft engines and other components due to their low density and high strength characteristics. However, their traditional casting process is complex and costly. Therefore, the microstructure evolution and the mechanism of twin growth of the 3D-printed pure titanium plate are studied through in-situ EBSD tensile testing. The results show that the main deformation modes are dislocation slip and deformation twins. With the increase of displacement, the internal slip lines of the α grains increase. The distance between adjacent slip lines is narrowed to accommodate the increased macro strain. The proportion of high-angle grain boundaries on the material’s surface reaches an impressive 76.3%, significantly enhancing the strength and hardness of the material. The KAM increases with the tensile displacement, and the strain at the grain boundaries exceeds that within the grains. This indicates that the tensile deformation predominantly occurs at the grain boundaries. The maximum misorientation angle between the twin and parent grain reaches 85.13°, indicating that the twin belongs to the tensile twin. When the tensile displacement reaches 400 μm, the twins begin to emerge on the sample’s surface, and the twins expand through dislocation slip. With the increase of displacement, the slip line increases, and the twins expand. The intrinsic law of “grain boundary-regulated strength-dislocation-twinning deformation” during the tensile process of 3D-printed pure titanium plates is revealed systematically. The theoretical support at the level of micro-mechanisms is provided for optimizing its preparation process and service performance.