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The Role of Acoustic Pressure during Solidification of AlSi7Mg Alloy in Sand Mold Casting

1
CMEMS—UMinho, Campus de Azurém, 4800-058 Guimarães, Portugal
2
MEtriCS—UMinho, Campus de Azurém, 4800-058 Guimarães, Portugal
*
Author to whom correspondence should be addressed.
Metals 2019, 9(5), 490; https://doi.org/10.3390/met9050490
Received: 25 March 2019 / Revised: 23 April 2019 / Accepted: 25 April 2019 / Published: 27 April 2019
(This article belongs to the Special Issue Casting and Forming of Advanced Aluminum Alloys)
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Abstract

New alloy processes have been developed and casting techniques are continuously evolving. Such constant development implies a consequent development and optimization of melt processing and treatment. The present work proposes a method for studying the influence of acoustic pressure in the overall refinement of sand cast aluminum alloys, using and correlating experimental and numerical approaches. It is shown that the refinement/modification of the α-Al matrix is a consequence of the acoustic activation caused in the liquid metal directly below the face of the acoustic radiator. Near the feeder, there is a clear homogeneity in the morphology of the α-Al with respect to grain size and grain circularity. However, the damping of acoustic pressure as the melt is moved away from the feeder increases and the influence of ultrasound is reduced, even though the higher cooling rate seems to compensate for this effect. View Full-Text
Keywords: ultrasonic melt refinement; sand casting: acoustic radiator; α-Al grain size; aluminum alloy ultrasonic melt refinement; sand casting: acoustic radiator; α-Al grain size; aluminum alloy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Puga, H.; Barbosa, J.; Carneiro, V.H. The Role of Acoustic Pressure during Solidification of AlSi7Mg Alloy in Sand Mold Casting. Metals 2019, 9, 490.

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