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<p>In this study, a TiAl–TC25G gradient alloy for high-performance blisk was successfully fabricated using the laser directional energy deposition (L-DED) method. Microstructural and phase analysis of TiAl–TC25G gradient material, especially the intermediate transition zone with thickness of 1.6mm, have been detailed. With the composition change from TC25G to TiAl alloy, the microstructure evolved from a (α + β) basket-weave to a lamellar (α<sub>2</sub> + γ) structure with a significant amount of massive γ phase (γ<sub>m</sub>). The mechanical properties of the gradient alloy testing under room temperature and 550&#xa0;°C have been investigated. Due to the precipitation of B<sub>2</sub> phases, the transition zone exhibits anomalously high hardness with discontinuous distribution. The fracture strength of gradient material is 492.75MPa at room temperature. When the test temperature increases to 550&#xa0;°C, the fracture strength decreases to 439.5&#xa0;MPa. Finite element analysis indicates that the gradient layer significantly enhances the coordinated deformation capability of the gradient materials.</p> Graphical abstract <p></p>

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Microstructure and mechanical properties of TiAl–TC25G gradient material fabricated by laser directed energy deposition technique

  • 期刊论文

  • 发表日期：

    2025年3月24日

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  • Yaru Liu,
  • Xunjie Yao,
  • Jiaxing Han,
  • Lingyi Cao,
  • Yang Wang,
  • Xinming Lei,
  • Xu Cheng,
  • Xianzhe Ran,
  • Dong Liu

摘要

In this study, a TiAl–TC25G gradient alloy for high-performance blisk was successfully fabricated using the laser directional energy deposition (L-DED) method. Microstructural and phase analysis of TiAl–TC25G gradient material, especially the intermediate transition zone with thickness of 1.6mm, have been detailed. With the composition change from TC25G to TiAl alloy, the microstructure evolved from a (α + β) basket-weave to a lamellar (α2 + γ) structure with a significant amount of massive γ phase (γm). The mechanical properties of the gradient alloy testing under room temperature and 550 °C have been investigated. Due to the precipitation of B2 phases, the transition zone exhibits anomalously high hardness with discontinuous distribution. The fracture strength of gradient material is 492.75MPa at room temperature. When the test temperature increases to 550 °C, the fracture strength decreases to 439.5 MPa. Finite element analysis indicates that the gradient layer significantly enhances the coordinated deformation capability of the gradient materials.

Graphical abstract