Microstructure and Texture in Copper Sheets after Reverse and Cross Rolling

Abstract:

The objectives of this investigation are structural effects in electrolytic copper sheets which are caused by the change of the direction of rolling. Unidirectional, reverse as well as cross-rolling at 90° respectively at 45° to the precedent rolling direction have been applied down to final deformations as low as 80% reduction in thickness. Texture has been determined by ACOM (Automated Crystal Orientation Measurement, “Automated EBSD”) in the SEM and by X-ray pole figure measurement. The main benefits of ACOM are a high spatial resolution which enables the investigation of texture gradients from the mid plane to the surface of the sheet, and the visualization of the microstructure by crystal orientation mapping. In addition to local texture, statistical distributions of misorientations across grain boundaries and of S grain boundaries have been derived from the individual grain orientation data. The change of the path of plastic deformation induces a destabilization of the substructure which is formed during the primary step of unidirectional rolling. A distinct change of texture is found depending on the deformation process. In cross rolling, the b fiber changes into the unstable b90 fiber which almost disappears with progressive deformation along the new rolling direction.

• Periodical: Solid State Phenomena (Volume 105)
• Pages: 309-314
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.105.309
• Online since: July 2005
• Authors: M. Ostafin, Jan Pospiech, Robert A. Schwarzer
• Keywords: ACOM, Copper (Cu), Cross-Rolling, Deformation Texture, Electron Backscatter Diffraction (EBSD), Grain Boundary, X-Ray Pole Figure Measurement, Σ Misorientations

References

[1] J. Pospiech, Z. Jasieński, A. Litwora and A. Piątkowski: The Influence of transverse rolling on texture and microstructure. Proc. of 12th ICOTOM, Montreal (Canada) 1999, pp.581-586.

[2] J. Pospiech, M. Wróbel, J. Bonarski and M. Blicharski: Texture formation with different rolling modes in copper. Mater. Sci. Forum Vol. 408-412 (2002), pp.613-618.

DOI: 10.4028/www.scientific.net/msf.408-412.613

[3] S. Suwas, A.K. Singh, N. Narasimha Rao and T. Singh: Effect of modes of rolling on evolution of the texture in pure copper and some copper-base alloys. Part I: Rolling texture. Z. Metallkunde Vol. 93 (2002), pp.918-927.

DOI: 10.3139/146.020918

[4] J. Pospiech, M. Ostafin and R.A. Schwarzer: Microstructural Aspects of Crossrolling of Copper. Inżynieria Materiałowa Vol. 6 (2003), pp.802-805.

[5] R.A. Schwarzer: Automated crystal lattice orientation mapping using a computercontrolled SEM. Micron 28 (1997), pp.249-265.

DOI: 10.1016/s0968-4328(97)00010-3

[6] Z. Jasieński, J. Pospiech, A. Piątkowski, R. Schwarzer, A. Litwora and M. Ostafin: Textural and structural effects of the change of deformation path in copper single crystals in channel-die test. Archives of Metallurgy and Materials Vol. 49 (2004).