Microstructure of AlSi17Cu5 alloy after overheating over liquidus temperature
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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 Al 2 Cu, Al 4 Cu 9 which are the ingredients of eutectics -AlCu - and phase Al 9 Fe 2 Si which is a part of eutectic -AlFeSi - was confirmed.
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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 Al 2 Cu, Al 4 Cu 9 which are the ingredients of eutectics -AlCu - and phase Al 9 Fe 2 Si which is a part of eutectic -AlFeSi - was confirmed.
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