Texture Development in 6000 Series Al-Mg-Si Alloys for Car Body Panels

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Recovery, recrystallization and the formation of recrystallization textures were investigated in three representative Al-Mg-Si alloys used for car body panels. Commercial hot bands of AA6016, AA6111 and AA6061 Al-Mg-Si alloys finished at low temperatures were cold rolled to a rolling reduction of 95 % in thickness and isothermally annealed at temperatures between 250 and 500 °C. In these alloys, precipitation was completed for the most part during low temperature hot rolling, and the sizes and the amount of fine precipitates formed during this low temperature hot rolling strongly affected recrystallization and the development of recrystallization textures. As a result, in the specimens annealed at 300 °C, quite different recrystallization behavior and recrystallization textures were observed. In the AA6061 alloy, in which, among three alloys, the maximum amount of Mg2Si should be precipitated, recrystallization was significantly suppressed. This resulted in the formation of strong {110} <111> and {100} <013> recrystallization textures. Also in the AA6111 alloy, in which precipitation of a medium amount of Mg2Si was expected, recrystallization was retarded to the same extent. In this alloy, however, recrystallization textures consisted of very strong {100} <001> and rather strong {110} <111> main orientations. In theAA6016 alloy, in which the minimum amount of Mg2Si and a large amount of Si particles should be precipitated, recrystallization occurred very rapidly, forming very weak recrystallization textures. In all alloys, annealing at higher temperatures resulted in the formation of weak textures, since fine precipitates were dissolved during annealing. Thus, the solution treatment, which is a necessary step to induce bake hardening in these alloys, randomizes their recrystallization textures.

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Periodical:

Materials Science Forum (Volumes 558-559)

Edited by:

S.-J.L. Kang, M.Y. Huh, N.M. Hwang, H. Homma, K. Ushioda and Y. Ikuhara

Pages:

77-84

DOI:

10.4028/www.scientific.net/MSF.558-559.77

Citation:

H. Inagaki "Texture Development in 6000 Series Al-Mg-Si Alloys for Car Body Panels ", Materials Science Forum, Vols. 558-559, pp. 77-84, 2007

Online since:

October 2007

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$35.00

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