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<p>This study examines the microstructural characteristics, mechanical properties, and high-temperature performance of Ti65 titanium alloy fabricated via laser additive manufacturing (LAM). Microstructural analysis reveals the presence of columnar grains and α + β lamellar structures, with notable variations across different regions, including the additively manufactured zones and interface areas. Room-temperature and high-temperature (650&#xa0;°C) mechanical testing indicates pronounced anisotropy in yield strength, ultimate tensile strength, elongation, and reduction in area, particularly between V-type and L-type joint configurations. At elevated temperatures, although the strength decreases, the alloy exhibits enhanced ductility, which is attributed to the activation of improved plastic deformation mechanisms. The effects of interfacial features and microstructural anisotropy are discussed in relation to dislocation behavior and deformation processes. These findings advance the understanding of how LAM process parameters influence the microstructure and mechanical performance of Ti65, providing valuable insights for optimizing its additive manufacturing for applications demanding high mechanical strength and thermal stability.</p>

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Laser Additive Manufactured V-Shaped and L-Shaped Ti65 Titanium Alloy Interfaces and High-Temperature Performance

  • 期刊论文

  • 发表日期：

    2025年7月9日

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  • Liping Liu,
  • Xiaodan Li,
  • Jun Yin,
  • Changyu Wang,
  • Jingjing Zhang,
  • Pengfei Li

摘要

This study examines the microstructural characteristics, mechanical properties, and high-temperature performance of Ti65 titanium alloy fabricated via laser additive manufacturing (LAM). Microstructural analysis reveals the presence of columnar grains and α + β lamellar structures, with notable variations across different regions, including the additively manufactured zones and interface areas. Room-temperature and high-temperature (650 °C) mechanical testing indicates pronounced anisotropy in yield strength, ultimate tensile strength, elongation, and reduction in area, particularly between V-type and L-type joint configurations. At elevated temperatures, although the strength decreases, the alloy exhibits enhanced ductility, which is attributed to the activation of improved plastic deformation mechanisms. The effects of interfacial features and microstructural anisotropy are discussed in relation to dislocation behavior and deformation processes. These findings advance the understanding of how LAM process parameters influence the microstructure and mechanical performance of Ti65, providing valuable insights for optimizing its additive manufacturing for applications demanding high mechanical strength and thermal stability.