Abstract
In this study, Fe₃Al intermetallic and Q235 steel were jointed by the vacuum diffusion bonding. The shear strength of the Fe₃Al/Q235 interface was analyzed and the interfacial fracture morphology was observed by means of scanning electronic microscope (SEM). The experimental results indicated that the fracture location was on the Fe₃Al side, and the shear rupture morphology was the cleavage characteristics with little toughness fracture. Most micro-cracks propagated along the interface near the Fe₃Al side and sometimes leaned to the center of the interface. The Fe₃Al/Q235 diffusion bonding joint with excellent interface combination and the sufficient shear strength (112 MPa) can be obtained when the heating temperature was 1060 °C, the holding time was 45-60 min and the pressure was 12-15 MPa.

Key words
diffusion bonding, interface, shear strength, fracture morphology

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