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Meeting 2017 TMS Annual Meeting & Exhibition
Symposium Cast Shop Technology: Recycling and Sustainability Joint Session
Presentation Title Improved Recyclability of Cast Al-alloys by Engineering β-Al<sub>9</sub>Fe<sub>2</sub>Si<sub>2</sub> Phase
Author(s) C. B. Basak, N. Hari Babu
On-Site Speaker (Planned) C. B. Basak
Abstract Scope Castability and tensile properties of recycled cast Al-Si alloys are affected by the presence of high iron content. The present study demonstrates a promising scope of better recyclability by engineering the intermetallic β-phase that present in cast Al-6wt% Si model alloy systems with as high as 2wt% Fe. Thermodynamic interplay between Si and Fe concentration on the formation of the β-phase and the solidification behaviour of this hypoeutectic Al-Si alloy has been explored. It has been demonstrated that suitable heat treatment alters the morphology of the β-phase and simultaneous addition of Cu improves the strength. Based on the experimental evidences, the mechanism behind the solid-state morphological changes of beta phase has been proposed. Experimental results and thermodynamic calculations suggest that Cu content of more than 2wt% marginally increases the yield of beta phase; however, at 4wt% Cu the solid solution strengthening improve the strength of solutionized alloy.
Proceedings Inclusion? Planned: Light Metals


Centrifugal Casting of Al-Si Scrap
Dross Formation Mechanisms of Thermally Pre-treated Used Beverage Can Scrap Bales with Different Density
Improved Recyclability of Cast Al-alloys by Engineering β-Al9Fe2Si2 Phase
Influence of Coating and De-coating on the Coalescence of Aluminium Drops in Salt
The Scale-up of High Shear Processing for the Purification of Recycled Molten Scrap Aluminium Alloy: Key Features of Fluid Flow
Tramp Element Accumulation and Its Effects on Secondary Phase Particles

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