Electrical annealing of severely deformed copper:microstructure and hardness

Saeed Nobakht; Mohsen Kazeminezhad

doi:10.1007/s12613-017-1506-2

Volume 24 Issue 10

Oct. 2017

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Article Navigation > International Journal of Minerals, Metallurgy and Materials > 2017 > 24(10): 1158-1168

Saeed Nobakhtand Mohsen Kazeminezhad, Electrical annealing of severely deformed copper:microstructure and hardness, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1158-1168. https://doi.org/10.1007/s12613-017-1506-2

Cite this article as:

Saeed Nobakhtand Mohsen Kazeminezhad, Electrical annealing of severely deformed copper:microstructure and hardness, Int. J. Miner. Metall. Mater., 24(2017), No. 10, pp. 1158-1168. https://doi.org/10.1007/s12613-017-1506-2

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Research Article

Electrical annealing of severely deformed copper:microstructure and hardness

Saeed Nobakht and
Mohsen Kazeminezhad

+ Author Affiliations

Corresponding author:
Mohsen Kazeminezhad E-mail: mkazemi@sharif.edu
Received: 3 December 2016; Revised: 26 February 2017; Accepted: 27 February 2017

Abstract

Abstract

Commercial pure copper sheets were severely deformed after primary annealing to a strain magnitude of 2.32 through constrained groove pressing. After induction of an electrical current, the sheets were heated for 0.5, 1, 2, or 3 s up to maximum temperatures of 150, 200, 250, or 300℃. To compare the annealing process in the current-carrying system with that in the current-free system, four other samples were heated to 300℃ at holding times of 60, 90, 120, or 150 s in a salt bath. The microstructural evolution and hardness values of the samples were then investigated. The results generally indicated that induction of an electrical current could accelerate the recrystallization process by decreasing the thermodynamic barriers for nucleation. In other words, the current effect, in addition to the thermal effect, enhanced the diffusion rate and dislocation climb velocity. During the primary stages of recrystallization, the grown nuclei of electrically annealed samples showed greater numbers and a more homogeneous distribution than those of the samples annealed in the salt bath. In the fully recrystallized condition, the grain size of electrically annealed samples was smaller than that of conventionally annealed samples. The hardness values and metallographic images obtained indicate that, unlike the conventional annealing process, which promotes restoration phenomena with increasing heating time, the electrical annealing process does not necessarily promote these phenomena. This difference is hypothesized to stem from conflicts between thermal and athermal effects during recrystallization.
- annealing;
- severe plastic deformation;
- copper;
- microstructure;
- hardness

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[1]	M. Atkinson, On the credibility of ultra-rapid annealing, Mater. Sci. Eng. A, 354(2003), No. 1-2, p. 40.
[2]	J. Wang, J. Li, X.F. Wang, J.J. Tian, C.H. Zhang, and S.G. Zhang, Effect of heating rate on microstructure evolution and magnetic properties of cold rolled non-oriented electrical steel, J. Iron Steel Res. Int., 17(2010), No. 11, p. 54.
[3]	A.A. Gazder, V.Q. Vu, A.A. Salah, P.E. Markovsky, O.M. Ivasishin, C.H.J. Davies, and E.V. Pereloma, Recrystallisation in a cold drawn low cost beta titanium alloy during rapid resistance heating, J. Alloys Compd., 585(2014), p. 245
[4]	F. Lefevre-Schlick, X. Wang, and D. Embury, The production of fine-scale microstructures by rapid annealing, Mater. Sci. Eng. A, 483-484(2008), p. 258.
[5]	R.F. Zhu, G.Y. Tang, S.Q. Shi, and M.W. Fu, Microstructure evolution of copper strips with gradient temperature in electropulsing treatment, J. Alloys Compd., 581(2013), p. 160.
[6]	W. Zhang, M.L. Sui, Y.Z. Zhou, and D.X. Li, Evolution of microstructures in materials induced by electropulsing, Micron, 34(2003), No. 3-5, p. 189.
[7]	Y.H. Zhu, S. To, W.B. Lee, X.M. Liu, Y.B. Jiang, and G.Y. Tang, Effects of dynamic electropulsing on microstructure and elongation of a Zn-Al alloy, Mater. Sci. Eng. A, 501(2009), No. 1-2, p. 125.
[8]	Y.B. Jiang, G.Y. Tang, C.H. Shek, J.X. Xie, Z.H. Xu, and Z.H. Zhang, Mechanism of electropulsing induced recrystallization in a cold-rolled Mg-9Al-1Zn alloy, J. Alloys Compd., 536(2012), p. 94.
[9]	W.C. Wu, Y.J. Wang, J.B. Wang, and S.M. Wei, Effect of electrical pulse on the precipitates and material strength of 2024 aluminum alloy, Mater. Sci. Eng. A, 608(2014), p. 190.
[10]	W. Jin, J.F. Fan, H. Zhang, Y. Liu, H.B. Dong, and B.S. Xu, Microstructure, mechanical properties and static recrystallization behavior of the rolled ZK60 magnesium alloy sheets processed by electropulsing treatment, J. Alloys Compd., 646(2015), p. 1.
[11]	Z.H. Xu, G.Y. Tang, S.Q. Tian, and J.C. He, Research on the engineering application of multiple pulses treatment for recrystallization of fine copper wire, Mater. Sci. Eng. A, 424(2006), No. 1-2, p. 300.
[12]	E. Rafizadeh, A. Mani, and M. Kazeminezhad, The effects of intermediate and post-annealing phenomena on the mechanical properties and microstructure of constrained groove pressed copper sheet, Mater. Sci. Eng. A, 515(2009), No. 1-2, p. 162.
[13]	M.A. Mostafaei and M. Kazeminezhad, Microstructure and mechanical properties improvement by ultra-rapid annealing of severely deformed low-carbon steel, Mater. Sci. Eng. A, 655(2016), p. 229.
[14]	A. Kauffmann, J. Freudenberger, H. Klauß, W. Schillinger, V. Subramanya Sarma, and L. Schultz, Efficiency of the refinement by deformation twinning in wire drawn single phase copper alloys, Mater. Sci. Eng. A, 624(2015), p. 71.
[15]	F. Shen, J.Q. Zhou, Y.G. Liu, R.T. Zhu, S. Zhang, and Y. Wang, Deformation twinning mechanism and its effects on the mechanical behaviors of ultrafine grained and nanocrystalline copper, Comput. Mater. Sci., 49(2010), No. 2, p. 226.
[16]	J.L. Bair, S.L. Hatch, and D.P. Field, Formation of annealing twin boundaries in nickel, Scripta Mater., 81(2014), p. 52.
[17]	H. Conrad, N. Karam, and S. Mannan, Effect of electric current pulse on the recrystallization of copper, Scripta Metall., 17(1983), No. 3, p. 411.
[18]	T.H. Chuang, C.H. Tsai, H.C. Wang, C.C. Chang, C.H. Chunang, J.D. Lee, and H.H. Tsai, Effects of annealing twins on the grain growth and mechanical properties of Ag-8Au-3Pd bonding wires, J. Electron. Mater., 41(2012), No. 11, p. 3215.
[19]	F. Fang, Y.B. Xu, Y.X. Zhang, Y. Wang, X. Lu, R.D.K. Misra, and G.D. Wang, Evolution of recrystallization microstructure and texture during rapid annealing in strip-cast non-oriented electrical steels, J. Magn. Magn. Mater., 381(2015), p. 433.
[20]	M. Ferry and D. Jones, High-rate annealing of single-phase and particle-containing aluminium alloys, Scripta Mater., 38(1998), No. 2, p. 177.
[21]	C. Yan, N. Li, H.W. Jiang, D.Z. Wang, and L. Liu, Effect of electropulsing on deformation behavior, texture and microstructure of 5A02 aluminum alloy during uniaxial tension, Mater. Sci. Eng. A, 638(2015), p. 69.
[22]	G.L. Hu, Y.H. Zhu, G.Y. Tang, C.H. Shek, and J.N. Liu, Effect of electropulsing on recrystallization and mechanical properties of silicon steel strips, J. Mater. Sci. Technol., 27(2011), No. 11, p. 1034.
[23]	Y.Z. Zhou, S.H. Xiao, and J.D. Guo, Recrystallized microstructure in cold worked brass produced by electropulsing treatment, Mater. Lett., 58(2004), No. 12-13, p. 1948.
[24]	S.H. Xiao, J.D. Guo, S.D. Wu, G.H. He, and S.X. Li, Recrystallization in fatigued copper single crystal under electropulsing, Scripta Mater., 46(2002), No. 1, p. 1.
[25]	Z.J. Wang and H. Song, Effect of electropulsing on anisotropy behaviour of cold-rolled commercially pure titanium sheet, Trans. Nonferrous Met. Soc. China, 19(2009), Suppl. 2, p. s409.
[26]	S.H. Xiao, Y.Z. Zhou, J.D. Guo, S.D. Wu, G. Yao, S.X. Li, G.H. He, and B.L. Zhou, The effect of high current pulsing on persistent slip bands in fatigued copper single crystals, Mater. Sci. Eng. A, 332(2002), No. 1-2, p. 351.
[27]	Y.Z. Zhou, W. Zhang, B.Q. Wang, and J.D. Guo, Ultrafine-grained microstructure in a Cu-Zn alloy produced by electropulsing treatment, J. Mater. Res., 18(2003), No. 8, p. 1991.
[28]	X.X. Ye, Z.T.H. Tse, G.Y. Tang, X.H. Li, and G.L. Song, Effect of electropulsing treatment on microstructure and mechanical properties of cold-rolled pure titanium strips, J. Mater. Process. Technol., 222(2015), p. 27.
[29]	F.J. Humphreys and M. Hatherly, Recrystallization and Related Annealing Phenomena, 2nd Ed., Elsevier, Oxford, 2004, p. 219.