Abstract
Different amounts of coarse intermetallic particles were produced in an aluminium alloy by variations of the iron content. Microstructural examination of the extrusion surface shows that Fe-rich intermetallic particles reduce the grain size, randomize the texture, retard the recrystallization process and decrease the difference in the fraction of high-angle grain boundaries. After alkaline etching, the primary intermetallic particles decrease the surface gloss and its variation on the same extrusion surface, reducing the tendency for streaking defects.
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