Investigation on Grain Size Effect of Rolling Texture in Copper

Abstract:

Cold rolling (CR) was conducted on coarse grained (CG) and ultrafine-grained (UFG) coppers, obtained by 1 and 8 passes in the equal channel angel pressing (ECAP), to investigate the effect of grain size on rolling texture. The microstructure was refined to UFG (~420 nm) with the ECAP pass increased to 8, while only band-like CG microstructure was observed in the 1 pass processed copper. The influence of the texture before CR could be excluded as the crystallographic texture kept similar for different ECAP pass. Pole figures (PFs) showed that the shear texture introduced by ECAP was replaced by rolling texture after CR. Furthermore, the rolling texture was a kind of classical copper-type for the CG copper, while a brass-type rolling texture was observed in the UFG copper. TEM results confirmed that the deformation nanotwins were only observed in the UFG copper, while the microstructure of CG copper was further compressed and subdivided. It indicated that the observed differences in rolling texture component and density might be contributed to the grain size effect which resulted in different deformation mechanism and grain subdivision behavior.

• Periodical: Materials Science Forum (Volume 850)
• Pages: 857-863
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.850.857
• Online since: March 2016
• Authors: Yao Jiang, Jing Tao Wang, Yue Wang, Jian Yin
• Keywords: Brass-Type Rolling Texture, Cold Rolling, Copper, ECAP, Grain Size Effect, XRD

References

[1] F.J. Humphreys, M. Hatherly, Recrystallization and Related Annealing Phenomena (Second Edition), in, Elsevier, Oxford, 2004, pp.67-90.

DOI: 10.1016/b978-008044164-1/50003-7

[2] R.E. Smallman, D. Green, The dependence of rolling texture on stacking fault energy, Acta Mater. 12 (1964) 145-154.

DOI: 10.1016/0001-6160(64)90182-8

[3] T. Leffers, R.K. Ray, The brass-type texture and its deviation from the copper-type texture, Prog. Mater. Sci. 54 (2009) 351-396.

DOI: 10.1016/j.pmatsci.2008.09.002

[4] H. -T. Liu, Z. -Y. Liu, Y. Sun, F. Gao, G. -D. Wang, Development of λ-fiber recrystallization texture and magnetic property in Fe–6. 5wt% Si thin sheet produced by strip casting and warm rolling method, Materials Letters. 91 (2013) 150-153.

DOI: 10.1016/j.matlet.2012.09.046

[5] P.P. Bhattacharjee, M. Joshi, V.P. Chaudhary, M. Zaid, The effect of starting grain size on the evolution of microstructure and texture in nickel during processing by cross-rolling, Mater. Charact. 76 (2013) 21-27.

DOI: 10.1016/j.matchar.2012.11.005

[6] W.B. Lee, B.J. Duggan, Effects of Grain Size on Rolling and Annealing Textures in 82% -92% Cold Rolled α-Brass, Textures Microstruct. 8 (1988) 155-172.

DOI: 10.1155/tsm.8-9.155

[7] T. Leffers, D.J. Jensen, Evaluation of the Effect of Initial Texture on the Development of Deformation Texture, Textures Microstruct. 6 (1986) 231-254.

DOI: 10.1155/tsm.6.231

[8] C. Deng, S.F. Liu, J.L. Ji, X.B. Hao, Z.Q. Zhang, Q. Liu, Texture evolution of high purity tantalum under different rolling paths, Journal of Materials Processing Technology. 214 (2014) 462-469.

DOI: 10.1016/j.jmatprotec.2013.09.026

[9] C.Y. Chung, Earring Control by Delayed Cross Rolling, in: Z. Liang, L. Zuo, Y. Chu (Eds. ) Proceedings of the Eleventh International Conference on Textures of Materials, International Academic Publishers, Beijing, 1996, p.6.

[10] C.F. Gu, L.S. Toth, Y.D. Zhang, M. Hoffman, Unexpected brass-type texture in rolling of ultrafine-grained copper, Scr. Mater. 92 (2014) 51-54.

DOI: 10.1016/j.scriptamat.2014.08.012

[11] C.F. Gu, M. Hoffman, L.S. Toth, Y.D. Zhang, Grain size dependent texture evolution in severely rolled pure copper, Mater. Charact. 101 (2015) 180-188.

DOI: 10.1016/j.matchar.2015.02.003

[12] K. Nakashima, Z. Horita, M. Nemoto, T.G. Langdon, Development of a multi-pass facility for equal-channel angular pressing to high total strains, Mat. Sci. Eng. A. 281 (2000) 82-87.

DOI: 10.1016/s0921-5093(99)00744-3

[13] J.T. Wang, Y. Zhang, J.Q. Liu, Continuous Recrystallization Phenomenon in High Purity Copper during Equal Channel Angular Pressing up to High Strain at Room Temperature, Mater. Sci. Forum. 584-586 (2008) 929-937.

DOI: 10.4028/www.scientific.net/msf.584-586.929

[14] H.J. Bunge, Texture Analysis in Materials Science, Butterworth, London, (1982).

[15] T. Sakai, A. Belyakov, R. Kaibyshev, H. Miura, J.J. Jonas, Dynamic and post-dynamic recrystallization under hot, cold and severe plastic deformation conditions, Prog. Mater. Sci. 60 (2014) 130-207.

DOI: 10.1016/j.pmatsci.2013.09.002

[16] Y. Iwahashi, Z. Horita, M. Nemoto, T.G. Langdon, The process of grain refinement in equal-channel angular pressing, Acta Mater. 46 (1998) 3317-3331.

DOI: 10.1016/s1359-6454(97)00494-1

[17] N.D. Stepanov, A.V. Kuznetsov, G.A. Salishchev, G.I. Raab, R.Z. Valiev, Effect of cold rolling on microstructure and mechanical properties of copper subjected to ECAP with various numbers of passes, Mat. Sci. Eng. A. 554 (2012) 105-115.

DOI: 10.1016/j.msea.2012.06.022

[18] F. Montheillet, M. Cohen, J.J. Jonas, Axial stresses and texture development during the torsion testing of Al, Cu and α-Fe, Acta Metall. 32 (1984) 2077-(2089).

DOI: 10.1016/0001-6160(84)90187-1

[19] S. Li, I.J. Beyerlein, M.A.M. Bourke, Texture formation during equal channel angular extrusion of fcc and bcc materials: comparison with simple shear, Mat. Sci. Eng. A. 394 (2005) 66-77.

DOI: 10.1016/j.msea.2004.11.032

[20] M.B. Cortie, Calculation of Texture Volume Fractions by Integration and Gaussian Fitting, Textures Microstruct. 29 (1997) 155-183.

DOI: 10.1155/tsm.29.155

[21] J. Hirsch, K. Lücke, Overview No. 76: Mechanism of deformation and development of rolling textures in polycrystalline f. c. c. metals—II. Simulation and interpretation of experiments on the basis of Taylor-type theories, Acta Metall. 36 (1988).

[22] M.G. Stout, J.A. O'Rourke, Experimental deformation textures of OFE copper and 70: 30 brass from wire drawing, compression, and torsion, Metallurgical Transactions A. 20 (1989) 125-131.

DOI: 10.1007/bf02647499