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Open AccessFeature PaperArticle

Magnesium Solubility in Primary α-Al and Heat Treatment Response of Cast Al-7Si-Mg

Department of Materials and Manufacturing, School of Engineering, Jönköping University, P.O Box 1026, SE-55111 Jönköping, Sweden
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Metals 2020, 10(5), 614; https://doi.org/10.3390/met10050614
Received: 11 April 2020 / Revised: 1 May 2020 / Accepted: 4 May 2020 / Published: 8 May 2020
(This article belongs to the Special Issue Heat Treatment of Non-ferrous Alloys)
Magnesium and silicon concentrations in the interior of primary α-Al of Al-7Si-Mg alloys were studied at temperatures in the liquid-solid range and just after solidification was completed. Analysis of the results showed that the magnesium concentration in the interior of primary α-Al is very low in the temperatures range from the liquidus to the start of the Al-Si eutectic reaction. Formation of silicon-rich phases during eutectic reactions, such as eutectic silicon and β-Al5FeSi, phases trigger a significant increase in the magnesium concentration in the interior of primary α-Al, when sufficient time is allowed for solid-state diffusion to occur. When fast cooling rates are applied during the Al-Si eutectic reaction, most of the magnesium is retained in π-Al8FeMg3Si6 and Mg2Si phases formed during solidification. Semi-solid Al-7Si-Mg castings were produced with varying magnesium contents, and the mechanical properties were evaluated in the as-cast, T5 and T6 conditions. It was found that the 0.2% offset yield strength of the semi-solid Al-7Si-Mg castings in the T5 and T6 conditions increases linearly with the square root of the magnesium concentration in the interior of the α-Al globules formed during the slurry preparation process. View Full-Text
Keywords: aluminium alloys; solid-solution; heat treatment; solubility; rheocasting; mechanical properties aluminium alloys; solid-solution; heat treatment; solubility; rheocasting; mechanical properties
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Santos, J.; Dahle, A.K.; Jarfors, A.E.W. Magnesium Solubility in Primary α-Al and Heat Treatment Response of Cast Al-7Si-Mg. Metals 2020, 10, 614.

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