Preliminary communication

Microstructure of AlSi17Cu5 alloy after overheating over liquidus temperature

J. Piątkowski ; The Silesian University of Technology, Faculty of Materials Science and Metallurgy, Katowice, Poland
R. Wieszała ; The Silesian University of Technology, Faculty of Transport, Katowice, Poland

Abstract

The paper presents microstructure tests of alloy AlSi17Cu5. In order to disintegrate the primary grain of silicon the so-called time-temperature transformation TTT was applied which was based on overheating the liquid alloy way over the temperature T_liq., soaking in it for 30 minutes and casting it to a casting mould. It was found that such process causes the achievement of fine-crystalline structure and primary silicon crystals take up the form of pentahedra or frustums of pyramids. With the use of X-ray microanalysis and X-ray diffraction analysis the presence of intermetallic phases Al₂Cu, Al₄Cu₉ which are the ingredients of eutectics α - AlCu - β and phase Al₉Fe₂Si which is a part of eutectic α - AlFeSi - β was confirmed.

Keywords

casting alloys Al-Si; microstructure; heat treatment in liquid state

Hrčak ID:

126713

URI

https://hrcak.srce.hr/126713

Publication date:

1.1.2015.

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