Microstructures and mechanical properties of transient liquid phase bonded Ti_3Al based alloy joints

Microstmcture and mechanical properties of Ti3 Al 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.