Metallurgical experimentation on the casting of pure aluminium

Τίτλος

Metallurgical experimentation on the casting of pure aluminium

Θέμα

Aluminum cans

Aluminum castings

Δημιουργός

Anastasiades, Panicos

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού.

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

2002

Συνεισφέρων

Katodrytis, G.

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

en

Τύπος

text

Αναγνωριστικό

MED0483

Σύνοψη

The grain structure of a specimen, produced by casting, is affected by the cooling rate, under which it solidifies and reaches ambient temperature.
The principle objective of this diploma project is to show that indeed the cooling rate during solidification of a material dictates the grain structure of the cast specimen. This can only be accomplished by casting specimens, under different conditions, in order to compare and comment on the differences between the specimens' crystal structures. The material that is to be used is commercially pure aluminium, due to its low melting temperature. In addition pure metals have a more simple grain structure than alloys. Also pure metals can be examined at lower magnification than alloys.
To achieve that a simple metal mould must be designed and constructed, which must contain a cylindrical cavity. This mould should be able to produce cylindrical specimens, which later on are to be machined, to obtain parts of the specimens chosen to be examined.
By applying several techniques during casting process different cooling rates are to be attained which will produce specimens with different grain structures. Such techniques include heating up the metal or heating the metal to be cast just above its melting point, to reduce temperature difference between the liquid metal and the mould and effectively reduce the cooling rate of solidification.
The specimens cast, should then be prepared for microscopic examination. The preparation includes polishing and etching sections of the specimens. This will reveal the specimens structure in order to examine the arrangement and size of the grains. Then, after examining the specimens' grain structures and photographing them, they should be compared between them to denote that the cooling rate of solidification during casting process affects the grain structure of the cast specimen.