MATERIALS TRANSACTIONS
Online ISSN : 1347-5320
Print ISSN : 1345-9678
ISSN-L : 1345-9678
Materials Processing
Non-Equilibrium Phase Crystallization of Al–Si Alloy Close to Eutectic Composition by Mechanical Vibration
Yuichiro MurakamiKenji MiwaJunichi ShinodaTakashi HondaNaoki Omura
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2022 年 63 巻 12 号 p. 1657-1661

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The amount of the primary phase crystallized in a eutectic alloy at a set cooling rate is determined by the alloy composition. Only a small amount of the primary phase can be crystallized in a near-eutectic composition alloy. Here we show an interesting phenomenon in which the microstructure is changed by the application of mechanical vibration to a near-eutectic Al–Si alloy during cooling from the molten metal to the semi-solid state. The amount of primary α-Al phase can be obtained with the application of mechanical vibration is more than equilibrium solidification. The amount of non-equilibrium α-Al phases, which is more than the amount with equilibrium solidification, increases with the velocity amplitude of the vibration. The non-equilibrium α-Al phases had uniform shape that consisted of fine spherical particles. These non-equilibrium α-Al phase crystals had the same composition as the primary α-Al phase crystals solidified without vibration. Primary Si particles could also be observed by the application of mechanical vibration.

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© 2022 Japan Foundry Engineering Society
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