Iron is present in nearly all aluminum alloys as an impurity causing a formation of iron-rich precipitates in the as-cast state of the alloy due to its low solubility in the matrix. Dispersion, morphology and relative coarseness of precipitates may affect formation of unwanted pinholes during cold rolling to thin gauges. When used as foil stock these pinholes may negatively affect utility of the foil. Heat treatment may be employed during down-stream processing to influence distribution of the precipitates. An impact of a high temperature annealing on iron-rich precipitates in a twin-roll cast EN-AW 8006 alloy was investigated. Electrical resistivity measurements with a heating rate simulating industrial annealing was performed to determine phase transformation temperatures. In-situ electron microscopy annealing was employed to directly observe mictrostructural transformations in the selected temperature intervals.Keywords: Aluminum alloy, twin-roll casting, electron microscopy, annealing, resistometry
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