High-strength lightweight Al-based composites are promising materials for a wide range of applications. To provide high performance, a strong bonding interface for effective load transfer from the matrix to the reinforcement is essential. In this work, the novel AlBC reinforced Al composites have been in situ fabricated through a liquid-solid reaction method and the bonding interface between AlBC and Al matrix has been unveiled. The HRTEM characterizations on the AlBC/Al interface verify it to be a semicoherent bonding structure with definite orientation relationships: (0001)//(11̅1);[112̅0]//[011]. Periodic arrays of geometrical misfit dislocations are also observed along the interface at each (0001) plane or every five (11̅1) planes. This kind of interface between the reinforcement and the matrix is strong enough for effective load transfer, which would lead to the evidently improved strength and stiffness of the introduced new AlBC/Al composites.
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