The Influence of Eutectic Solidification on Hot Tearing of Al-Si Alloys

Vella, Ben (2002). The Influence of Eutectic Solidification on Hot Tearing of Al-Si Alloys Honours Thesis, School of Engineering, The University of Queensland.

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Author Vella, Ben
Thesis Title The Influence of Eutectic Solidification on Hot Tearing of Al-Si Alloys
School, Centre or Institute School of Engineering
Institution The University of Queensland
Publication date 2002
Thesis type Honours Thesis
Supervisor Arne Dahle
Total pages 69
Language eng
Subjects 091405 Mining Engineering
Formatted abstract
Aluminium alloys are widely used due to their desirable properties. Over 30 million tonnes of primary aluminium was used in 2001. Aluminium is used for a wide variety of applications such as engine parts, electrical wires and cans to name a few. Over 90% of the aluminium alloys used are aluminium –silicon alloys.

Aluminium – silicon alloys can be easily modified and this can dramatically change the properties of the alloy. Although aluminium – silicon alloys are not as prone to hot tearing as the aluminium – copper alloys, hot tearing can still be a problem. Hot tearing is one of the most severe defects that a casting can have. It is thought to be caused by lack of interdendritic flow of liquid metal when the alloy is under strain in the last stages of solidification [1].

Modifiers such as strontium and sodium change the eutectic growth mode. The unmodified alloys show nucleation adjacent to the tips of the dendrites. Strontium modified alloys show independent nucleation in the interdendritic liquid and sodium modified alloys show eutectic growth opposite to the thermal gradient [2].

There has been very little, if any, research on the effect of solidification mode on hot tearing. Therefore this thesis aims to investigate the role the eutectic solidification mode has on hot tearing.
Keyword Al-Si Alloys

Document type: Thesis
Collection: UQ Theses (non-RHD) - UQ staff and students only
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Created: Thu, 04 Dec 2014, 13:52:43 EST by Asma Asrar Qureshi on behalf of Scholarly Communication and Digitisation Service