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Dislocation boundaries in drawn single crystal copper wires produced by Ohno continuous casting

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Abstract

Dislocation boundaries in drawn single-crystal copper wires produced by Ohno continuous casting have been studied via electron backscattering diffraction and transmission electron microscopy. In the undeformed wires, there are subgrains with misorientation angle lower than 4.2°. For the cold-drawn wires, we measured misorientation angle and spatial distribution of dislocation boundaries, analysing the formation mechanism of dislocation boundaries parallel to drawing direction. Regarding spatial distribution of high-angle dislocation boundaries, at the strains more than 2.77, the boundaries spread from the centre to the surface regions with increasing strain. Regarding the angular distribution of dislocation boundary misorientation, at the strain lower than 2.77, there is one peak lower than 5°. Increasing the strain to 4.12, a bimodal distribution of misorientation angles is observed. One is lower than 5°, and the other is between 45 and 50°. For dislocation boundaries parallel to drawing direction, although at low strains there are different deformation bands with different microstructures, at high strain the microstructures are characterized as dislocation boundaries parallel to drawing direction formed by two approaches: the interaction between two kinds of boundaries and the increase in misorientation angle of boundaries shared by some dislocation cells.

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Acknowledgements

Prof. I·P. Jones (Department of Metallurgy and Materials, Birmingham University, UK) is thanked for the help of the manuscript and useful conversations. Prof. Q. Liu (Chongqing University, PR China) is thanked for help with EBSD. This study was supported by the Natural Science Foundation of China under contracts no. 50471098 and 50771076 and the Education Department Foundation of Shaanxi Province, China, under contract No. 07JK274.

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Authors and Affiliations

  1. Department of Applied Physics, Northwestern Polytechical University, Xi’an, 710072, China

    J. Chen & W. Yan

  2. School of Materials Science and Chemical Engineering, Xi’an Technological University, Xi’an, 710032, China

    J. Chen, W. Yan & X. H. Fan

  3. Department of Metallurgy and Materials, University of Birmingham, Birmingham, B15 2TT, UK

    R. G. Ding

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  1. J. Chen
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  2. W. Yan
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  3. R. G. Ding
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  4. X. H. Fan
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Correspondence to W. Yan.

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Chen, J., Yan, W., Ding, R.G. et al. Dislocation boundaries in drawn single crystal copper wires produced by Ohno continuous casting. J Mater Sci 44, 1909–1917 (2009). https://doi.org/10.1007/s10853-008-3079-y

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