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The solidification and structure of Al-17wt.%Si alloy modified with intermetallic phases containing Ti and Fe

Piątkowski J., Formanek B.

Archives of Foundry Engineering

2011

Vol. 11, iss. 4

194-198

The article describes the process of casting and solidification of Al-17wt.%Si alloy that have been modified with composite powder containing the intermetallic phases of Ti and Fe. The chemical and phase composition of the applied modifier was described with the following formula: FeAlx-TiAlx-Al2O3. Applying the method of thermal analysis ATD, the characteristic parameters of the solidification process were determined, and exo-and endothermic effects of the modifying powder on the run of the silumin solidification curves were observed. By the methods of light, scanning, and X-ray microscopy, the structure of alloy and the chemical composition of the dispersion hardening precipitates were examined. A change in the morphology of Al-Si eutectic from the lamellar to fibrous type was reported together with changes in the form of complex eutectics of an Al-Si-Ti and Al-Si-Fe type and size reduction of primary silicon crystals.

Aluminium composite casting dispersion reinforced with iron-aluminium and silicon carbide phases

Formanek B., Piątkowski J., Szymszal J.

Archives of Foundry Engineering

2010

Vol. 10, iss. 4

35--38

Aluminium matrix composite with dispersion-reinforced, made by similar to stircasting process was characterised. The mixture of powders was produced by the process of mechanical agglomeration of powdered FexAly and SiC with aluminium. The chemical composition of agglomerates was selected in a way such as to obtain 25 wt.% reinforcement of the AlSi9Cu4 silumin matrix. Applying thermal analysis ATD, the alloy solidification process was determined, reading out the typical solidification parameters. The methods of light and scanning microscopy were used to reveal the structure of composite casting. Changes in chemical composition and phase composition of particles of the FeAl intermetallic phase in aluminium matrix were confirmed. The structure of silumin casting with matrix containing microregions of ceramic and intermetallic phases, typical of hybrid reinforcements, was obtained.