The Impact of Major Alloying Elements and Refiner on the SDAS of Al-Si-Cu Alloy
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Mile Djurdjevic
Abstract
This paper investigates the effect of some major alloying elements (silicon and copper) and the effect of grain refiner (titanium boride) on the size of the secondary dendrite arm spacing (SDAS) in series of Al-Si-Cu alloys. It has been shown that both silicon and copper have significant influence on this solidification parameter. The addition of grain refining master alloys to aluminium alloys is common practice in many commercial foundries aiming to reduce the grain size of Al-Si alloys. However, it was shown in the present paper that master alloy based on TiB had an unexpected impact on the SDAS, decreasing the size of SDAS. In addition, there is a minimum of SDAS corresponding to the presence of 0.12 wt% of titanium in Al-Si alloy. Such findings could have important implications for Al-Si alloys in particular, due to their wide spread applications in the automotive industry.
Kurzfassung
Dieser Beitrag untersucht den Einfluss von Hauptlegierungselementen (Silizium und Kup-fer) sowie der Kornfeinungszusätze (Titan-Borid) auf den Wert des sekundären Dendritenarmabstands (SDAS) in Al-Si-Cu-Legierungensreihen. Es wird aufgezeigt, dass die Erstarrungsparameter stark von Silizium und auch Kupfer beeinflusst werden. Dabei ist es in vielen Gießereien üblich, Aluminiumlegierungen zur Reduzierung der Korngröße von Al-Si-Legierungen kornfeinende Ausgangslegierungen zuzugeben. Vorliegender Beitrag zeigt jedoch auf, dass die Ausgangslegierung auf der Grundlage von TiB den sekundäre Dendritenarmabstand unerwartet beieinflusst und den SDAS-Wert reduziert. Des Weiteren existiert ein minimaler sekundärer Dendritenarmabstand bezogen auf die vorhandenen 0,12 Masse-% Titan in der Al-Si Legierung. Solche Ergebnisse können durchaus ernstzunehmende Auswirkungen, insbesondere für Al-Si-Legierungen, die in der Automobilindustrie breite Verwendung finden, haben.
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© 2009, Carl Hanser Verlag, München
Articles in the same Issue
- Contents/Inhalt
- Inhalt / Contents
- Technical Contributions/Fachbeiträge
- Untersuchungen zum Einfluss der Kornorientierung auf Nanoindentations-Messungen an Reineisen
- Grain Growth Analyses of AlMn Alloys Using Texture and Microstructure Imaging Techniques with High-Energy Synchrotron Radiation
- The Impact of Major Alloying Elements and Refiner on the SDAS of Al-Si-Cu Alloy
Articles in the same Issue
- Contents/Inhalt
- Inhalt / Contents
- Technical Contributions/Fachbeiträge
- Untersuchungen zum Einfluss der Kornorientierung auf Nanoindentations-Messungen an Reineisen
- Grain Growth Analyses of AlMn Alloys Using Texture and Microstructure Imaging Techniques with High-Energy Synchrotron Radiation
- The Impact of Major Alloying Elements and Refiner on the SDAS of Al-Si-Cu Alloy
