Development of microstructure and texture during rolling of single-phase and two-phase cube-oriented Al-Cu single crystals

• Published in: Scripta materialia Vol. 41; no. 5; pp. 493 - 503
• Main Authors: Engler, O., Kong, X.W., Lücke, K.
• Format: Journal Article
• Language: English
• Published: New York, NY Elsevier Ltd 06-08-1999; Elsevier Science
• Subjects: Applied sciences; Cold working, work hardening; annealing, post-deformation annealing, quenching, tempering recovery, and crystallization; Cold working, work hardening; annealing, quenching, tempering, recovery, and recrystallization; textures; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Materials science; Metals. Metallurgy; Physics; Treatment of materials and its effects on microstructure and properties; Aluminium base alloys; Crystal orientation; Rolling; Experimental study; Texture; Group IIIA metal; Binary alloys; Monocrystals; Dual phase structure; Rolling texture; Copper alloys; Microstructure; TEM; Pole figures
• ISSN: 1359-6462; 1872-8456
• DOI: 10.1016/S1359-6462(99)00180-3

Upon rolling deformation of the homogeneous supersaturated Al-Cu single crystal the initial cube-orientation developed increasing orientation scatter which finally split off into the various symmetrical variants of the rolling texture S-orientation. Thus, the overall rolling texture strongly resembled that of polycrystalline Al-alloys. Whereas in the middle parts of the sheets, where the plain stress condition was approximately fulfilled, the original cube-orientation was quite stable, towards the sheet edges gradually increasing RD-rotations formed. These rotations were attributed to an opposite RD-rotation of the stress tensor due to the friction between the rolls and the widening specimen. With further increasing rolling reduction the rolling direction-rotated cube-orientations broke up each into two variants of the S-orientation. In the two-phase crystal well-defined deformation zones around the plate-like Al sub 2 Cu- theta particles were observed. At low reduction degrees distinct < 121 > -lattice rotations within the deformation zones indicated local slip activity on individual slip systems. At higher rolling degrees the deformation zones of several slip systems were included to overlap such that the individual < 121 > -lattice rotations were superimposed. Altogether, the lattice rotations in the deformation zones superimposed to the widely scattering transverse direction-rotations observed in the x-ray pole figures.