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Microstructure of ECAE-Processed Copper after Long-Term Room-Temperature Storage

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Abstract

The microstructure in two copper samples processed by equal channel angular extrusion (ECAE) using either 90 deg rotations between passes (route Bc) or without rotations (route A) has been examined following storage at room temperature for a period of 8 years. In both samples the deformation microstructure was significantly heterogeneous, as indicated by large differences between the extent of microstructural refinement from place to place along the center line of the extrusion. The route Bc sample, however, showed a greater degree of heterogeneity, though with an overall lower degree of refinement. A number of recrystallized grains were seen in both samples, with a greater recrystallized fraction observed for the route Bc sample. The effect of the processing route on the microstructure and consequences of the observed heterogeneity for microstructural characterization of ECAE-processed material are discussed.

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Acknowledgments

Financial support from the Danish National Research Foundation through the Center for Fundamental Research: Metal Structures in Four Dimensions and from the National Natural Science Foundation of China (NSFC) (Contract No. 50571049) is acknowledged. The authors are grateful to Drs. D. Juul Jensen, N. Hansen, and J.R. Bowen for useful discussions of the results presented in this work.

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Authors and Affiliations

  1. Center for Fundamental Research: Metal Structures in Four Dimensions, Materials Research Department, Risø National Laboratory for Sustainable Energy, Technical University of Denmark, DK-4000, Roskilde, Denmark

    O.V. Mishin (Senior Scientist)

  2. Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing, 100084, P.R. China

    A. Godfrey (Professor)

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  1. O.V. Mishin
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  2. A. Godfrey
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Correspondence to O.V. Mishin.

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Manuscript submitted March 26, 2008.

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Mishin, O., Godfrey, A. Microstructure of ECAE-Processed Copper after Long-Term Room-Temperature Storage. Metall Mater Trans A 39, 2923–2930 (2008). https://doi.org/10.1007/s11661-008-9658-3

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