The Influence of Silicon Content on Recrystallization of Twin-Roll Cast Aluminum Alloys for Heat Exchangers
M. Pokováa, b, M. Cieslara and J. Lacazeb
aCharles University in Prague, Faculty of Mathematics and Physics, Ke Karlovu 5, 121 16 Prague 2, Czech Republic
bCIRIMAT, ENSIACET, 5 allée Emile Monso, B.P. 44362, 31030 Toulouse cedex 4, France
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Thin foils of aluminum alloys are commonly used in automotive industry for manufacturing heat exchangers. Use of twin-roll casting instead of direct-chill casting requires modifications in the manufacturing process and use of improved materials. In the present study, the evolution in microstructure and mechanical properties during isochronal annealing of two AW3003-based alloys differing in silicon content was monitored. The silicon influenced both the microhardness and precipitation kinetics during annealing, but not the recrystallization temperature. Precipitation of cubic α-Al15(Mn,Fe)3Si2 phase occurred in two steps in the material with higher Si content, while mainly precipitates of Al6(Mn,Fe) phase formed in the second material in a broad temperature interval, preferentially at grain boundaries.
DOI: 10.12693/APhysPolA.122.625
PACS numbers: 81.40.Ef, 68.37.Lp, 81.30.Mh