A study on the TLP diffusion bonding of Ti-22Al-25Nb alloy
In order to realize high quality joining of the Ti2AlNb alloy of Ti-22Al-25Nb, transient liquid phase (TLP) diffusion bonding method with Ti-15Cu-15Ni (wt％) as interlayer was performed using thermal-mechanical simulator Gleeble 1500D. The effects of bonding parameters on the joint features such as microstructures, element distribution, tensile strength and fracture characteristic were studied. The results indicate that a suitably long holding time and high bonding temperature would benefit the formation of joints with homogeneous compositions and high strength. Nb is the mainly controlling element to the formation of composition-homogenous bonding zone. The bonding zone of joint with a rapid cooling technology after dwelling at bonding temperature is composed of B2 phase. Slow cooling technology is beneficial to both modify the microstructures and improve the strength of the joints. The tensile strength at room temperature of the joint under the joining conditions of bonding temperature 970℃ for 90min with a slow cooling technology reached up to 1018MPa, which was equal to 93 ％ of base material tensile strength, obviously higher than the joint strength of 931MPa with a rapid cooling technology.
Ti2AlNb alloy TLP diffusion bonding microstructures tensile strength
Guisheng ZOU Erhu XIE Hailin BAI Aiping Wu Qing Wang Jialie REN
Department of Mechanical Engineering, Tsinghua University and Key Laboratory for Advanced Manufacturing by Materials Processing Technology, Ministry of Education of P.R.China, Beijing 100084, China
国际会议
郑州
英文
2007-10-23（万方平台首次上网日期，不代表论文的发表时间）