关键词: 焊接, 镍基高温合金, 强度, 组织, 钛铝系合金

Abstract:

Titanium aluminides are one of the most promising structural materials with potential applications in aerospace field. Joining titanium aluminide to nickel-based superalloy could decrease the weight of composite structure. Due to the major difference in chemical composition and physical properties, the dissimilar joining of the two materials is extremely difficult. Based on the published literatures, the research advances on their joining, including fusing welding, brazing and diffusion bonding, are reviewed. The joint strengths obtained through fusing welding are low. Additionally, only traditional filler metals are used during the brazing of the two materials, and the study on high temperature brazing alloys is insufficient. The high-temperature property of the interlayers for diffusion bonding, as an important issue, needs research in future. Solving the joining problem between titanium aluminide and nickel-based superalloy, and achieving joints with excellent comprehensive properties, should be of great significance for the engineering application of titanium aluminides.

Key words: joining, microstructure, nickel-based superalloys, strength, titanium aluminides