Ta/Cu transition region in TC4/Inconel718 bimetallic structure fabricated by laser deposition manufacturing

The bimetallic structure formed by TC4 and Inconel718 has broad potential applications in aerospace. Based on the laser deposition manufacturing technique, a TC4/Inconel718 bimetallic structure was fabricated via the Ta/Cu transition layer. The test results indicated that a Ta/Cu transition region with a width of 475.0 mu m was formed. The microstructure of the transition region changed from a reticular to a rod structure, and the corresponding phase compositions were beta-Ta + Ti2Cu + TiCu and TiCu+gamma-Cu + Cr2Ta. Owing to the formation of Ti-Cu and Cr-Ta phases in the transition region, the Vickers hardness reached 444.0 HV. The ultimate tensile strength was 280 MPa, and the fracture morphology presented a quasi-cleavage fracture, which occurred in the Ta/Cu transition region where Ti-Cu brittle phases exist.

Automated summary

The bimetallic structure of TC4 and Inconel718 fabricated via Ta/Cu transition layer showed excellent mechanical properties and hardness. The microstructure and phase composition of the transition region changed, resulting in high hardness and ultimate tensile strength.