Diffusion bonding of TiAl based alloy to Ti–6Al–4V alloy using amorphous interlayer |
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Authors: | Z. Xue Q. Yang L. Gu X. Hao Y. Ren Y. Geng |
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Affiliation: | School of energy, power and mechanical engineering, North China Electric Power University, Beijing, PR China |
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Abstract: | Powder metallurgical TiAl based alloy and Ti–6Al–4V (TC4) alloy were diffusion bonded at 915 °C for 1 h under a pressure of 80 MPa. Single Ti‐based amorphous or Ni‐based amorphous foil was utilized as an interlayer during diffusion bonding process. The tensile mechanical properties of the diffusion bonded joints between TiAl based alloy and TC4 alloy were tested. The fracture surface and microstructure characteristic of these joints were also observed carefully by scanning electron microscope. The TiAl based alloy with a fully lamellar microstructure is more suitable for diffusion bonding to TC4 alloy. Adding a Ti‐based amorphous interlayer is more conducive to the element diffusion, giving rise to the improvement in the mechanical properties of the diffusion bonded joints. Results also show that the diffusion bonded joints form a metallurgical bond and fracture in a brittle manner. |
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Keywords: | Diffusionsschweiß en pulvermetallurgische TiAl‐Basislegierungen amorphe Zwischenlagen mechanische Eigenschaften Bruchflä chenmorphologie Diffusion bonding powder metallurgical TiAl based alloy amorphous interlayer mechanical properties fracture morphology |
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