Thin strip of industrial pure 1050 aluminum alloy was produced by top side-pouring twin-roll casting process

and its microstructure was observed.The results show that the as-cast 1050 strip exhibits satisfy in surface appearance with little defect.The thickness of the strip is increased with the increasing length and then to be stable.The microstructure observation reveals that apparent difference in the microstructure can be observed between the upper roll and lower roll sides.On the upper roll side

the microstructure belongs to solidification structure with equiaxed growth

while on the lower roll side

the microstructure is the rolling deformation structure.In addition

there exists a boundary line at the middle

which is attributed to the improvement of heat transfer condition caused by rolling force.