Effects of Squeeze Pressure on Microstructure, Porosity and Hardness of an In-Situ Mg2Si/Al–Si–Cu Composite

Gökhan Ozer; Kerem Altug Güler; Hüseyin Murat Lus

doi:10.3139/120.110293

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Effects of Squeeze Pressure on Microstructure, Porosity and Hardness of an In-Situ Mg₂Si/Al–Si–Cu Composite

Gökhan Ozer , Kerem Altug Güler und Hüseyin Murat Lus

Veröffentlicht/Copyright: 26. Mai 2013

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Abstract

The effect of applied pressure on microstructures and properties of an in-situ formed Mg₂Si/Al-Si-Cu reinforced metal matrix composite fabricated by squeeze casting are investigated. Due to the wide solidification range and the high viscosity, this type of composites is prone ro shrinkage and gas porosity. In order to improve cast ability and to obtain better properties, the squeeze casting technique has been used. The results showed that primary Mg₂Si crystals are formed by adding pure Mg into the hypereutectic Al-Si-Cu alloy (A380). It was found that, with the application of 30 MPa and 40 MPa pressure during solidification, the average size of primary Mg₂Si particulates decreases from about 87 µm to about 21 and 18 µm and that the average porosity values of the cast samples is significantly decreased from 8.75 % to 0.50 and 0.35 %, respectively.

Kurzfassung

Die Effekte des anliegenden Pressdruckes auf die Mikrostruktur und die Eigenschaften eines in-situ geformten und mittels Pressgießens hergestellten Mg₂Si/Al-Si-Cu Metallmatrix-Komposits wurden untersucht. Aufgrund des großen Erstarrungsintervalls und der hohen Viskosität hat dieser Komposittyp eine hohe Schrumpfung und ist anfällig für Porenbildung. Um die Gießbarkeit und die Eigenschaften zu verbessern, wurde das Pressdruckverfahren angewendet. Die Ergebnisse zeigen, dass infolge der Zugabe von reinem Mg in die hypereutektische Al-Si-Cu-Legierung (A 380) primäre Mg₂Si-Kristalle gebildet werden. Es stellte sich heraus, dass bei einem Druck von 30 bis 40 MPa während der Erstarrung die durchschnittliche Größe der Mg₂Si Partikel von etwa 87 µm auf etwa 21 und18 µm abnimmt und dass die durschnittliche Porösität der Proben signifikant von 8,75 % auf 0,5 und 0,35 % reduziert werden kann.

Gökhan Özer, born in 1978, is research assistant at the Yildiz Technical University since 2002. He is also co-researcher at the Balkan Centre of Advanced Casting Technologies (BCACT). Presently, he is PhD student in the casting of non-ferrrous metals.

Kerem Altug Güler, born in 1981, is research assistant at the Yildiz Technical University since 2004. He is also co-researcher at the Balkan Centre of Advanced Casting Technologies (BCACT). Presently, he is PhD student in investment casting.

Huseyin Murat Lus was born in Erzurum, Turkey, in 1973. He graduated from the, Department of Metalurgical Engineering in 1996. He got his M. S. degree in 1999 and PhD. Degree in 2007 at the Yildiz Technical University in Material Science. Since 1998, he has been working as a research assistant at YTU. Huseyin Murat Lus is also member of the Balkan centre for Advanced Casting Technologies.

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Published Online: 2013-05-26

Published in Print: 2012-01-01

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https://doi.org/10.3139/120.110293