Nucleation and Growth Dynamics of the α-Al / β-Al5FeSi Eutectic in a Complex Al-Si-Cu-Fe Alloy

Terzi, Sofiane, Taylor, John A., Cho, Young-Hee, Salvo, Luc, Suery, Michel, Boller, Elodie and Dahle, Arne K. (2010). Nucleation and Growth Dynamics of the α-Al / β-Al5FeSi Eutectic in a Complex Al-Si-Cu-Fe Alloy. In: Osamu Umezawa, Shinji Kumai, Yoshimasa Takayama, Takayuki Tsuchida and Tatsuo Sato, Proceedings of the 12th International Conference on Aluminium Alloys. The 12th International Conference on Aluminium Alloys (ICAA12), Yokohama, Japan, (1273-1278). 5-9 September 2010.

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Author Terzi, Sofiane
Taylor, John A.
Cho, Young-Hee
Salvo, Luc
Suery, Michel
Boller, Elodie
Dahle, Arne K.
Title of paper Nucleation and Growth Dynamics of the α-Al / β-Al5FeSi Eutectic in a Complex Al-Si-Cu-Fe Alloy
Formatted title
Nucleation and Growth Dynamics of the α-Al / β-Al5FeSi Eutectic in a Complex Al-Si-Cu-Fe Alloy
Conference name The 12th International Conference on Aluminium Alloys (ICAA12)
Conference location Yokohama, Japan
Conference dates 5-9 September 2010
Proceedings title Proceedings of the 12th International Conference on Aluminium Alloys
Place of Publication Tokyo, Japan
Publisher The Japan Institute of Light Metals
Publication Year 2010
Sub-type Fully published paper
Editor Osamu Umezawa
Shinji Kumai
Yoshimasa Takayama
Takayuki Tsuchida
Tatsuo Sato
Start page 1273
End page 1278
Language eng
Abstract/Summary Secondary-sourced recycled aluminium alloys can exhibit high levels of different impurities. It is well known that the presence of iron, the most common impurity, can lead to the formation of hard and brittle intermetallic phases which are detrimental to the machining properties and the mechanical behaviour of the material in service. The purpose of this work is to study the nucleation and growth of the β-Al5FeSi intermetallic phase in the framework of the eutectic reaction: Liquid → α-Al + β-Al5FeSi. In situ X-ray microtomography has been used to investigate the formation of the irregular eutectic β-phase plates during the solidification at low cooling rate of an Al-8Si-4Cu-0.8Fe alloy. The results show that only a few plates form, nucleating early near the sample surface. Next, growth occurs very rapidly in the principal growth direction and slowly in the thickness direction. The plates are highly branched and appear to form as a divorced eutectic, i.e. not coupled with the α-Al. These features are inconsistent with the common irregular eutectic solidification theory based on the Jackson and Hunt model.
Keyword X-ray microtomography
Fe-containing intermetallics
Aluminum alloys
Solidification microstructure
Q-Index Code E1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Conference Paper
Collection: School of Mechanical & Mining Engineering Publications
 
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Created: Wed, 23 Mar 2011, 15:18:56 EST by Sally Beard on behalf of School of Mechanical and Mining Engineering