Study on Interface Microstructures of Cu-Al Composite Plate Fabricated by Cast Rolling

The microstructure of Cu-Al composite plate based on the cast-rolling technology is investigated by scanning electron microscope, x-ray diffractometer, energy-dispersive spectroscopy and transmission electron microscopy. The interfacial structure is analyzed by high-resolution transmission electron microscopy. The results show that the copper–aluminum composite plates with oxygen-freed metallurgical bonding interface by cast rolling. The interfacial intermetallic is CuAl 2 with a thickness of 0.35 μm. There is a crystallographic orientation relationship between the matrix Al and CuAl 2 . The (200) crystal plane of CuAl 2 parallels to the ( 111̅ ) crystal plane of Al with the mismatch of 0.22.