Journal of Light Metal Welding
Online ISSN : 2186-618X
Print ISSN : 0368-5306
ISSN-L : 0368-5306
Processing of Recycled AA6111 Aluminium Alloy from Two Different Feedstock of Aluminium Metal Scraps
Isaac ChangDan LuoKawther Al-HelalJayesh B PatelYan HuangGeoff ScamansZhongyun Fan
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2020 Volume 58 Issue Supplement Pages 29s-32s

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Abstract

 Recycling of scrap Al requires 5% of energy and saves 95% of CO2 emission as compared to the production of primary Al. Hence, there is an increasing demand to exploit the use of recycled Al alloys to reduce energy consumption and carbon footprint associated with the manufacturing processes. However, a major technical challenge to the widespread use of recycled Al is the presence of high impurity content such as Fe, which can severely deteriorate its mechanical performance. Hence, the development of a new technology is crucial to the production of good quality recycled Al alloys from the metal scrap. A melt conditioned direct chill (MC-DC) technology has been developed at BCAST which is based on the application of a high shear dispersive mixer in the molten alloy prior to solidification to produce a fine as-cast microstructure with reduced segregation in the absence of any grain refiners. This study is concerned with the microstructure/properties of recycled AA6111 Al alloy billets produced from two different metal scraps including Incinerator Bottom Ash (BA) and Old Rolled Taint Tabor (TT), using a combination of the novel MC-DC, together with a combination of hot extrusion, cold rolling and heat treatment processes.

 The production of recycled AA6111 aluminium alloy blanks with good mechanical performance comparable to primary AA6111 alloy has been demonstrated via melt conditioned DC casting of metal scraps together with downstream thermomechanical processing using extrusion and rolling operation. Sample processed from Old Rolled Taint Tabor (TT) metal scraps gives similar alloy composition and mechanical performance after T6 heat treatment. However, sample processed from Incinerator Bottom Ash (BA) metal scrap consisted of relatively high amount of Si content, leading to finer grain structure and marginally better mechanical performance in T4 condition.

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© 2020 Japan Light Metal Welding Association
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