日本金属学会誌

J. Japan Inst. Metals, Vol. 60, No. 8 (1996),
pp. 708-716

Microstructure and Texture of A1050 Aluminium StripsProduced by Melt Direct-Rolling Method

Yuichi Nagai, Nobuhiro Tsuji,Tetsuo Sakai and Yoshihiro Saito

Department of Materials Science and Engineering, Faculty of Engineering, Osaka University, Suita

Abstract:

The microstructure and texture of the aluminium strips produced by a melt direct-rolling method are inhomogeneous in the direction of sheet thickness. The regions near surface (about 30% thickness of the strip) show fine and equiaxed grains formed by geometric dynamic recrystallization and have a typical shear texture (<{110}>//RD fiber texture including the {111}<{110}> and {001}<{110}> orientations), while the center layer shows elongated grains and has a typical rolling texture. This inhomogeneity is due to the large shear deformation induced by friction during rolling. Near the surface, the microstructure shows no remarkable changes during annealing below 673 K, but the relative intensities of the {111}<{110}> and {113}<{110}> orientations increase. Relatively large r and very large Δ{r} are obtained by the tension test of the direct-rolled strip and they vary with the textures depending on the annealing temperature. The present study has clarified that the melt direct-rolling method is useful to develop the {111} texture in aluminium strips by the introduction of large shear deformation during rolling.


(Received April 3, 1996)

Keywords:

near net shape process, shear deformation, {111} texture, geometric dynamic recrystallization, Lankford value, segregation


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