Abstract
The effect of temperature and time of homogenization on intermetallic phase dissolution and transformation in 6066 alloy was studied. Microstructure examination has been carried out on the samples in the as-cast state and after different time of homogenization at 560°C using optical microscope - Nikon 300, scanning (SEM) electron microscopy combined with an energy dispersive X-ray microanalysis (EDS) and X-ray diffraction (XRD). The results show that the as-cast microstructure of 6066 contained β-Mg2Si, Si, Q-Al5Cu2Mg8Si6, b-Al5FeSi, α-Al(MnFe)Si and Al2Cu intermetallic phases. Significant changes in microstructure followed after homogenization process were revealed. The majority of Al2Cu, Q and Mg2Si particles have dissolved in a-Al, and plate-like b-Al5FeSi precipitates transformed into multiple, spherical α-Al(MnFe)Si.
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