Abstract:The microstructure and small energy multi-impact (SEMI) behavior of the transition region between a laser-clad Fe-Albronze coating and its aluminum alloy substrate have been investigated. The results show that the transition region consists of severallayers. The layer adjacent to the clad region is composed of nonuniform block-like Cu9Al4 and Cu3Al phases. The middle layer is characterized by a mixed structure of block-like Cu3Al and needle-like CuAl2. In the layer near to the substrate the volume fractivn of needle-like CuAl, phase decreases and volume fraction of a-Al phase increases when approaching to the substrate. Under SEMI loading,cracks initiate in the CuAl2, phase-rich region. Laser scanning velocity has a significant influence on the volume fraction of CuAl,phase, and thus directly affects the SEMI resistance of the transition region. The laser-clad bronze coatings produced at a scanningvefority of 10mm/s to 14 mm/s has better resistance to SEMI than those produced at higher scanning velocities.