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Effects of Fe, Mn, chemical grain refinement and cooling rate on the evolution of Fe intermetallics in a model 6082 Al-alloy

M.H. Khan, Amit Das Orcid Logo, Z. Li, H.R. Kotadia

Intermetallics, Volume: 132, Start page: 107132

Swansea University Author: Amit Das Orcid Logo

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DOI (Published version): 10.1016/j.intermet.2021.107132

Abstract

The solidification microstructures formed in a model 6082 alloy with 0.2–1.0 wt % Fe were examined under different cooling rates and the effects of 0.5 wt % Mn and Al–5Ti–1B grain refiner addition investigated. The results were compared against Thermo-Calc, differential scanning calorimetry (DSC) an...

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Published in: Intermetallics
ISSN: 0966-9795
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56233
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Abstract: The solidification microstructures formed in a model 6082 alloy with 0.2–1.0 wt % Fe were examined under different cooling rates and the effects of 0.5 wt % Mn and Al–5Ti–1B grain refiner addition investigated. The results were compared against Thermo-Calc, differential scanning calorimetry (DSC) and cooling curve analysis. Fe promotes primary-Al grain refinement from growth restriction and constitutional undercooling effects but increases detrimental β–(Al9Fe2Si2) intermetallic. Mn contributes to primary-Al grain refinement from growth restriction and promotes the formation of α–Al15(Fe,Mn)3Si2 at the expense of increased intermetallic content. Al–5Ti–1B inoculation not only produces the strongest refinement of primary-Al grains but also refines the Fe-intermetallics by enhancing their nucleation and restricting their growth volume in the interdendritic liquid pockets.
Keywords: Aluminium alloys, Iron intermetallics, Solidification, Microstructure modification, Grain refinement
College: Faculty of Science and Engineering
Start Page: 107132

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