Effect of Thermomechical Pretreatment on Mechanical Properties of Modified Al-Mn-Fe-Si Based Alloys

Author:

Cieslar Miroslav1,Slámová Margarita2,Hájek Michal1,Veselý Jozef1

Affiliation:

1. Charles University

2. Research Institute for Metals, Ltd

Abstract

Fins in automotive heat exchangers are manufactured from Al-Mn-Fe-Si foils. Since continuous twin-roll casting (TRC) reduces energy and work consumption, it is the preferred manufacturing technology. The precipitation processes resulting from annealing of TRC Al-Mn-Fe- Si based alloys were studied by resistometric measurements during linear heating from room temperature up to 620 °C, hardness measurements and transmission electron microscopy examinations. Primary particles and precipitates of the cubic α-Al15(Mn,Fe)3Si2, hexagonal Al8Fe2Si and orthorhombic Al6(Fe,Mn) phases were identified. Phases of different types prevail in different alloys depending on composition. The increase of cold rolling prestrain prior to annealing induces a significant shift to lower temperatures of the start of precipitation. Prestrain accelerates precipitation kinetics by redistributing solute atoms and favoring their segregation on nucleation sites such as dislocations, subgrain and grain boundaries.

Publisher

Trans Tech Publications, Ltd.

Subject

Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science

Reference5 articles.

1. B.Q. Li: JOM Vol. 47 (1995) p.13.

2. M. Cieslar, M. Slámová, J. Uhlíř, C. Coupeau and J. Bonneville: Kovové Materialy, in press.

3. S. P . Chen, N.C.W. Kuijpers and S. van der Zwaag: Mat. Sci. Eng Vol. A341 (2003) p.296.

4. J.E. Hatch: Aluminum. Properties and Physical Metallurgy (Metals Park, Ohio, ASM 1984).

5. X. Huang, N. Hansen and N. Tsuji: SCIENCE Vol. 312 (2006) p.249.

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