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The Influence of Iron Content on the Tensile Properties and Anodizing Response

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The Influence of Iron Content on the Tensile Properties and Anodizing
Response of AA6060 Extrusions

Lisa Sweet, CAST CRC, Melbourne, Australia
Xinquan Zhang, Rio Tinto Alcan, Melbourne, Australia
Nick Birbilis, Monash University, Melbourne, Australia
and Mark Easton, CAST CRC, Melbourne, Australia


ABSTRACT—Recycling of aluminum alloys leads to significant reductions in energy usage and
greenhouse gas emissions. One way primary producers can improve the sustainability of the
aluminum industry is to increase the level of scrap introduced into alloy products. However, iron
(Fe) pick-up can limit the amount of recycled material used, primarily due to its detrimental
effects on mechanical properties and anodizing response. This paper explores the effect of
increasing Fe content (0.17 to 0.29 weight percent (wt %)) within the AA6060 compositional
range, by measuring the changes in tensile properties and anodizing response. While the changes
in tensile properties were found to be small, the increased Fe content led to a reduction in gloss of
the anodized piece. These effects were related to the intermetallic number density.

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