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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 1879-0216
Published: Elsevier BV 2021
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URI: https://cronfa.swan.ac.uk/Record/cronfa56233
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
Funders: This research was funded by the Industrial Cooperative Awards in Science & Technology (CASE) (voucher no. 17000037). In addition to that, the characterisation facility is supported from the Higher Education Funding Council for England (HEFCE) fund and the WMG Centre High Value Manufacturing Catapult is gratefully acknowledged.
Start Page: 107132

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