FE-RICH PRECIPITATES IN TWIN-ROLL CAST 8006 ALUMINUM ALLOY AND THEIR EVOLUTION DURING HIGH TEMPERATURE ANNEALING

1 KRÁLÍK Rostislav
Co-authors:
1 HÁJEK Michal 1 KŘIVSKÁ Barbora 1 BAJTOŠOVÁ Lucia 1 BAJER Jan 1 CIESLAR Miroslav
Institution:
1 Charles University, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic, rkralik96@gmail.com
Conference:
28th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 22nd - 24th 2019
Proceedings:
Proceedings 28th International Conference on Metallurgy and Materials
Pages:
1572-1577
ISBN:
978-80-87294-92-5
ISSN:
2694-9296
Published:
4th November 2019
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
26 views / 13 downloads
Abstract

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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