3Al/Ti2AlNb異種合金接頭。分析了保溫時(shí)間（10~90 min）對(duì)Ti3Al/Ti2AlNb接頭微觀結(jié)構(gòu)及力學(xué)性能的影響，并研究了TLP擴(kuò)散連接接頭的界面演變和形成機(jī)制。結(jié)果表明，Ti3Al/Ti2AlNb接頭具有典型的“Ti3Al | Al0.5Nb0.5Ti3 | 殘余 Ni | NiTi | NiTi2 | 殘余 Ti | Al0.5Nb0.5Ti3 | Ti2AlNb”多層梯度結(jié)構(gòu)。隨著保溫時(shí)間的延長(zhǎng)，接頭的抗剪切強(qiáng)度先增大后減小，當(dāng)保溫時(shí)間達(dá)到60 min時(shí)，Ti3Al/Ti2AlNb接頭的抗剪切強(qiáng)度最大，達(dá)到167±12 MPa。另外，接頭的斷裂主要發(fā)生在Ti2AlNb/Ti附近的NiTi2層，并向Ti層延伸，呈現(xiàn)出脆性斷裂的特征。;Using Ni-Ti duplex foils as joining materials, Ti3Al alloy was bonded to Ti2AlNb alloy by transient liquid phase (TLP) diffusion bonding at 990 °C under low bonding pressure (0.1 MPa). The effects of bonding time on the microstructure and mechanical properties of Ti3Al/Ti2AlNb joint were analyzed, as well as the interfacial evolution and forming mechanism of the TLP joint were studied. Results show that the Ti3Al/Ti2AlNb alloy joints with typical interface structure of Ti3Al | Al0.5Nb0.5Ti3 | residual Ni | NiTi | NiTi2 | residual Ti | Al0.5Nb0.5Ti3 | Ti2AlNb can be formed. In addition, with the extension of bonding time, the shear strength of the joint first increases and then decreases, and the maximum shear strength, up to 167±12 MPa, of the Ti3Al/Ti2AlNb alloy joint can be achieved when the bonding time reaches 60 min. The joint fracture, characterized by brittle fracture, mainly occurs at the NiTi2 layer adjacent to the Ti2AlNb/Ti interlayer and extends to the Ti interlayer."/>
3Al;Ti2AlNb;瞬時(shí)液相;擴(kuò)散連接;界面結(jié)構(gòu);Ti3Al;Ti2AlNb;transient liquid phase (TLP);diffusion bonding;interface structure"/>