Casting and Analysis of Squeeze Cast Aluminium Silicon Eutectic Alloy

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dc.contributor.authorSmillie, Matthew Johnen
dc.date.accessioned2008-09-07T21:52:08Z
dc.date.available2008-09-07T21:52:08Z
dc.date.issued2006en
dc.description.abstractSqueeze casting is the practise of solidifying metals under mechanically applied pressure via a slow displacement of a die volume. It has been shown that squeeze casting enhances the mechanical properties of cast metals. Research into other high integrity casting processes has shown that using techniques that enhance melt quality can further increase the mechanical properties. Therefore a bottom-tapped, bottom-fed squeeze casting machine was designed and built around a pre-existing squeeze casting die designed for uniaxial pressure application. This was used to obtain quantitative metallurgical and microstructural information on the squeeze castings produced, including the effects of common micro-alloying additions of strontium modifier and titanium modifier on the microstructure and hardness of a commercial aluminium silicon eutectic alloy. These were examined using a Taguchi design of experiments approach. It was found that squeeze casting reduced porosity and secondary dendrite arm spacing and increased hardness, and reduced or eliminated increases in porosity and secondary dendrite arm spacing associated with micro-alloying addition. The size of possibly deleterious iron-rich precipitates was reduced, and the morphology of such precipitates changed to a possibly less deleterious form without further alloy additions of manganese. It was also found that melt control and handling is essential for consistent quality of castings in the production of small volume squeeze castings, such as the ones produced in this experimental work.en
dc.identifier.urihttp://hdl.handle.net/10092/1086
dc.identifier.urihttp://dx.doi.org/10.26021/3423
dc.language.isoen
dc.publisherUniversity of Canterbury. Mechanical Engineeringen
dc.relation.isreferencedbyNZCUen
dc.rightsCopyright Matthew John Smillieen
dc.rights.urihttps://canterbury.libguides.com/rights/thesesen
dc.subjectAluminium Silicon eutectic alloysen
dc.subjectsqueeze castingen
dc.subjectbottom feden
dc.subjectporosityen
dc.subjectdendrite arm spacingen
dc.subjectsecondary dendrite arm spacingen
dc.subjectstrontium modifieden
dc.subjecttitanium modifieden
dc.subjectiron-rich precipitatesen
dc.titleCasting and Analysis of Squeeze Cast Aluminium Silicon Eutectic Alloyen
dc.typeTheses / Dissertations
thesis.degree.disciplineMechanical Engineeringen
thesis.degree.grantorUniversity of Canterburyen
thesis.degree.levelDoctoralen
thesis.degree.nameDoctor of Philosophyen
uc.bibnumber1019947en
uc.collegeFaculty of Engineeringen
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