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ASM Handbook

Casting

Edited by
Srinath Viswanathan
Srinath Viswanathan
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Diran Apelian
Diran Apelian
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Raymond J. Donahue
Raymond J. Donahue
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Babu DasGupta
Babu DasGupta
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Michael Gywn
Michael Gywn
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John L. Jorstad
John L. Jorstad
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Raymond W. Monroe
Raymond W. Monroe
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Mahi Sahoo
Mahi Sahoo
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Thomas E. Prucha
Thomas E. Prucha
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Daniel Twarog
Daniel Twarog
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ASM International
Volume
15
ISBN electronic:
978-1-62708-187-0
Publication date:
2008
Book Chapter

Modification of Aluminum-Silicon Alloys[1]

By
G.K. Sigworth
G.K. Sigworth
Alcoa Primary Metals
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Published:
2008
Page range:
240 - 254
Publication history
September 15, 2008

Abstract

This article focuses on aspects important for the commercial production of castings. It discusses the modification process in hypoeutectic and eutectic alloys that differ only in the relative volume fraction of primary aluminum and aluminum-silicon eutectic. The article explains how modification changes porosity formation in a casting. It describes the mechanisms responsible for silicon modification, as well as the modifications and changes in eutectic nucleation and eutectic grain structure. The article reviews the usage of strontium during process steps in foundry practices. The growth of silicon eutectic is described to explain effects ancillary to silicon modification. The article also discusses the effects of elements, such as phosphorus, antimony, bismuth, magnesium, boron, and calcium, on the silicon structure.

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G.K. Sigworth, 2008. "Modification of Aluminum-Silicon Alloys", Casting, Srinath Viswanathan, Diran Apelian, Raymond J. Donahue, Babu DasGupta, Michael Gywn, John L. Jorstad, Raymond W. Monroe, Mahi Sahoo, Thomas E. Prucha, Daniel Twarog

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