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Licensed Unlicensed Requires Authentication Published by De Gruyter May 31, 2013

Quench Sensitivity of Medium and High Strength Aluminium Alloys

  • Cemal Oksuz , Ozkan Sen , Rafet Bozdogan and Mustafa Cigdem
From the journal Materials Testing

Abstract

An attempt has been made to determine the suitability of the conventional Jominy end quench test for assessing the quenching behaviour of heat treatable aluminium alloys. Hence it was decided to apply the Jominy test initially on specimens of 6061, 2024, and 7075 alloys possessing considerable differences in quenching response.

The Jominy test with slight modification was found to be successful in revealing the quenching response of the alloys studied. Experimental results have indicated that the quench sensitivity of these alloys increases in the order of 6061, 2024, and 7075. The quench sensitivity of Al alloys is primarily governed by two factors. Firstly, the increase in the concentration of the alloying elements increases the quench sensitivity. Secondly, the elements that form high temperature intermetallics make aluminium alloys more quench sensitive.

Kurzfassung

Abschreckverhalten von Aluminiumlegierungen mit mittlerer und hoher Festigkeit. Im vorliegenden Beitrag wird über den Versuch berichtet, die Eignung des konventionellen Jominy-Abschreckversuches zur Einschätzung des Abschreckverhaltens von wärmebehandelbaren Aluminiumlegierungen zu untersuchen. Hierzu wurde zunächst entschieden, den Jominy-Versuch an Proben der Legierungen 6061, 2024 und 7075 anzuwenden, die bemerkenswerte Unterschiede in ihrem Abschreckverhalten aufweisen.

Es stellte sich heraus, dass der Jominy-Versuch mit leichter Modifizierung das Abschreckverhalten der untersuchten Legierungen wiedergibt. Die Untersuchungsergebnisse haben gezeigt, dass die Abschreckempfindlichkeit dieser Legierungen in der Reihenfolge 6061, 2024 und 7075 zunimmt. Die Abschreckempfindlichkeit von Aluminiumlegierungen wird vor allem durch zwei Faktoren bestimmt. Erstens steigt mit zunehmenden Anteilen an Legierungselementen die Abschreckempfindlichkeit. Zweitens machen die Elemente, die intermetallische Verbindungen bei hohen Temperaturen bilden, abschreckempfindlicher.


Cemal Oksuz was born in Trabzon-Turkey in 1959 and graduated from The Turkish Airforce Academy in 1981. He served in various departments of Turkish Airforce as a commander for about 12 years. He received his B.Sc. and M.Sc. Degrees from the Aircraft Engineering Department of Istanbul Technical University in 1993 and 1996 respectively. He continued to work as a lecturer in Turkish Airforce Academy up to 2008. Since then he is working as the head of Turkish Airlines Aviation Academy.

Ozkan Sen was born in 1974 in Turkey. He works as a research assistant in the Metallurgical and Materials Engineering Department of the Yildiz Technical University since 1995. He received his B.S., M.S. and Ph.D. degrees from the same department of the Yildiz Tehnical University in 1994, 1998, and 2004, respectively. He also worked as a chief of the foundry during his military obligation in 2005. His research interests are on the thermal analysis, fluidity, and melt treatments of cast irons, aluminium-silicon casting alloys and brass casting. He also works in the field of design and simulation of castings. He has published national and international conference papers and journal articles in relation with his research areas.

Rafet Bozdogan was born in Kahramanmaras, Turkey, in 1960 and has graduated from Metallurgical Engineering of the Istanbul Technical University in 1986. He received his M.Phil. and Ph.D. degrees from the Department of Metallurgy and Materials Science of the Birmingham University in 1989 and 1991, respectively. He joined the Aircraft Engineering Department of the Istanbul Technical Üniversity as a lecturer in 1992. Then he has resigned from the University and joined to private sector for three years with a part time lecturer in 1996. He was appointed as a Head of Department in the Metropolitan Municipality of Istanbul for the transportation system of the city in 1999. He served for 7. 5 years at the municipality. He has again moved to private sector in 2007. He is now the CEO of the joint venture of C'C Construction Co and Arcus Engineering Co.

Mustafa Cigdem was born in 1964 in Turkey. He is a Professor of Metallurgy and Materials at Yildiz Technical University since 2000. He graduated as a metallurgical engineer from Istanbul Technical University in 1985. He received his master degree (M.Phil.) and Ph.D. in Metallurgy and Materials Science, in 1988 and 1990, respectively, both from the University of Birmingham, England. From 1990–1991 he worked as a research fellow in the same university. Since 1991 he has been with Yildiz Technical University, Turkey. He has led several industrial and academic R&D projects concerning the fabrication processes of non ferrous metals and alloys. He has published three books and more than 60 papers in various journals. He is a member of Turkish Aluminum Industrialists'Assosiation. He has contributed to the establishment of many companies in aluminium industry and is dedicated to inform the sector about the technological developments, economy of aluminium and future trends in aluminium consumptions. His research interests include continuous casting and thermo-mechanical processing of non ferrous metals, metal chemistry, expandable molding processes, investment casting of body implants and jewel products and economic metallurgy.


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Published Online: 2013-05-31
Published in Print: 2010-06-01

© 2010, Carl Hanser Verlag, München

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