Abstract:
In order to improve the intrinsic brittleness of Ti
2AlNb alloy without sacrificing its high-temperature performance, a composite material was prepared by combining it with high-temperature titanium alloy TA15 using vacuum hot pressing. The effects of different hot pressing temperatures on the microstructure and tensile properties of Ti
2AlNb/TA15 laminated composite materials were investigated. The results show that the pore defects in the interface layer gradually decrease with the increase of the hot pressing temperature. A defect-free metallurgical bonding interface can be achieved at temperatures of
1050℃ and above. The thickness of the interface reaction layer increases with the rise of the hot pressing temperature. Under the diffusion conditions at
1050℃ and above, a transition layer of certain width formed between the reaction zone and the Ti
2AlNb layers, which improve the properties of the interface bonding. Tensile tests indicate that the room and high-temperature tensile properties of the Ti
2AlNb/TA15 laminated composite material are significantly improved compared with Ti
2AlNb alloy. The laminated composite material under the hot pressing temperature condition of
1050℃ exhibits excellent comprehensive performance, with a high-temperature tensile strength and strain of 667.85 MPa and 16.2%, respectively.