Abstract Mo and Al rolled foils, of which thickness was 20 and 60 m respectively, were diffusion bonded at 873-913 K for 40-240 min. Primary phase of Mo-Al interfacial reaction was Al8Mo3, which nucleated in Mo foils and grew up with breaking the covering Mo layer. With diffusion bonding time increasing, Al8Mo3, Al5Mo and Al12Mo layers presented between Mo and Al, after bonding at 913K for 240 min, Al4Mo appeared between Al8Mo3 and Al5Mo. Kinetic analysis indicated that the incubation period of primary phase decreased from 52 to 34.5min when bonding temperature increased from 873 to 913 K, the pre-exponential factor and diffusion activation energy for an atom of Al in the new phases produced by Mo-Al reaction are 4.6110-2cm2/min and 0.98 eV respectively, correspondingly, those for an atom of Al in Mo foils are 2.0510-2cm2/min and 1.48 eV.
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