Abstract
In DC cast AA lxxx alloys, the presence of a fir-tree zone has long been recognized to be detrimental to the surface quality of critical sheet products. The fir-tree zone in DC cast ingots is mainly caused by a macroscopic transition between intermetallic phases. In this paper, the formation of major intermetallic phases commonly occurring in the DC ingot structure, such as Al3Fe, Al6Fe, AlmFe and α-AlFeSi, is investigated by using deep-etching and SEM techniques. The three-dimensional morphologies of intermetallic particles revealed by deep-etching are presented. Based on the morphological and growth kinetic aspects, the growth mechanisms of different intermetallic phases are discussed. The nucleation behaviors of intermetallics observed by SEM are also demonstrated.
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