The Influence of Silicon Content on Recrystallization of Twin-Roll Cast Aluminum Alloys for Heat Exchangers

Michaela Poková (1, 2) , Miroslav Cieslar (1) , Jacques Lacaze (2)

1 UK - Univerzita Karlova [Praha, Česká republika] = Charles University [Prague, Czech Republic]
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

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 alpha-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.

Mots clés: Heat echangers; Cast alluminium alloys; Microstructure; Mechanical properties

Domaines: Génie chimique

Michaela Poková, Miroslav Cieslar, Jacques Lacaze. The Influence of Silicon Content on Recrystallization of Twin-Roll Cast Aluminum Alloys for Heat Exchangers. Acta Physica Polonica A, 2012, vol. 122 (n° 3), pp. 625-629. ⟨hal-01170979⟩