Mechanical properties

interface

fracture morphology and composition analysis of the Ti-Al composite plate prepared by cast-rolling method were investigated by universal testing machine

MH-3micro hardness meter

optical microscope

SEM and EDS and XRD.The results indicate that the tensile strength of Ti-Al composite plate prepared by cast-rolling method reaches 172.3MPa

which is the greater than the theoretical value of 135.6 MPa.Micro hardness of the interface layer is between the two metals

and mico-hardness in partial zone reaches 450 HV due to generating TiAl

3

phase.The interface layer exhibits flat-straight structure

which is formed mainly metallurgical bonding layer by diffusion

and there exists a small amount of intermetallic compound TiAl

3

generated in partial zone.There is a phenomenon of warping and separation when the composite plate is stretched

and the fracture of the two metals is characterized by ductile fracture.