Taking 8079 aluminum alloy as the research object

sheet for double zero aluminum foil was cast rolled directly with electrolytic aluminum liquid. The effects of different cooling intensities on the grain structure and central layer segregation of 8079 aluminum alloy cast-rolled plate were systematically investigated by means of optical microscopy（OM）

scanning electron microscopy（SEM） and energy dispersive spectrometer（EDS）. The results indicate that when the cooling intensity is 3 500 W/（m

2

·K）

the grain is coarsened with grade 3

and the segregation phenomenon presents severe in the center layer of tested specimens. When the cooling intensity is increased to 4 000 W/（m

2

·K）

the grain size is gradually decreased

and the central layer segregation is weakened. When the cooling intensity is 4 500～5 500 W/（m

2

·K）

the grain size keeps stable with the increase of cooling intensity

which is about 54 μm

and absence of segregation is observed in the center layer. When the cooling intensity is increased to 6 000 W/（m

2

·K）

the grain size is excessively fine and absence of obvious segregation is observed in the center layer. When the cooling intensity ranging from 4 500 W/（m

2

·K） to 5 500 W/（m

2

·K）

the aluminum alloy cast-rolled plate without central segregation can be obtained

which exhibits uniform and fine microstructure.