Microstructures and mechanical properties of transient liquid phase bonded Ti₃Al based alloy joints

Microstmcture and mechanical properties of Ti₃Al based alloy joints bonded by transient liquid phase bonding were studied by scanning electron microscope (SEM) ,energy dispersive X-ray spectroscope (EDS) ,X-ray diffraction (XRD) and universal test machine.The results show that the integrated joints were prepared by TLP bonding with the TiZrNiCu alloy in-terlayer.The high bonding temperature and long bonding time help to obtain the joints with uniform composition and microstruc-ture.With bonding temperature and bonding time increasing,the width of the bonding zone increases and reaction zones decrea-ses.When bonding time is 60 min at bonding temperature of 900℃,the joint microstructure consists of Ti solid solution,Ti₃Al and Ti₂Cu and the joint strength of 420 MPa can be obtained.