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Wear resistance and electroconductivity in a Cu–0.3Cr–0.5Zr alloy processed by ECAP

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Abstract

The ultrafine-grained microstructures and functional properties, including wear resistance for dry sliding and electrical conductivity, were investigated in a Cu–0.3 %Cr–0.5 %Zr alloy processed by equal-channel angular pressing (ECAP) at a temperature of 400 °C to total strains of 1, 2, and 4. Severe plastic deformation by ECAP to a total strain of ~1 led to a significant decrease in the wear resistance because of the rapid surface damage to both solution-treated (ST) and aged (AT) samples where a high density of dislocations was arranged in stochastic low-angle subboundaries by brittle fracture. Further deformation by subsequent ECAP passes promoted the subdivision of the shear bands by geometrically necessary boundaries. Correspondingly, the number of fine crystallites outlined by high-angle boundaries increased, and the wear rate decreased. After four ECAP passes, the wear rate decreased to the level of the initial state of the alloy and equaled 1.68 × 10−5 mm3/(N m) and 1.40 × 10−5 mm3/(N m) for ST and AT samples, respectively. The results demonstrate that the damage mechanism is the controlling factor for wear resistance of Cu–Cr–Zr bronze hardened by intense plastic straining.

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Acknowledgements

AM and RK acknowledge financial support from the Ministry of Science and Education, Russia, under Grant No. 14.Y31.16.8446-NSH and APZ acknowledges a TECNIOSPRING grant financed by Generalitat de Catalunya and co-funded by the 7th Framework program of the EU and the Russian Science Foundation (Project 14-29-00199). TGL acknowledges support from the European Research Council under ERC Grant Agreement No. 267464-SPDMETALS.

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Authors and Affiliations

  1. Institute for Metals Superplasticity Problems, Khalturina 39, Ufa, Russia, 450001

    A. P. Zhilyaev

  2. Fundació CTM Centre Tecnològic, Plaça de la Ciencia 2, Manresa, 08242, Barcelona, Spain

    A. P. Zhilyaev

  3. Research Laboratory for Mechanics of New Nanomaterials, St. Petersburg State Polytechnical University, Polytechnicheskaya 29 St., Petersburg, Russia, 195251

    A. P. Zhilyaev

  4. Belgorod State University, Pobeda 85, Belgorod, Russia, 308015

    A. Morozova & R. Kaibyshev

  5. Departamento de Ciencia de los Materiales e Ingeniería Metalúrgica, ETSEIB–Universitat Politècnica de Catalunya, Av. Diagonal 647, 08028, Bacelona, Spain

    J. M. Cabrera

  6. Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton, SO17 1BJ, UK

    T. G. Langdon

Authors
  1. A. P. Zhilyaev
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  2. A. Morozova
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  3. J. M. Cabrera
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  4. R. Kaibyshev
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  5. T. G. Langdon
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Correspondence to A. P. Zhilyaev.

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Zhilyaev, A.P., Morozova, A., Cabrera, J.M. et al. Wear resistance and electroconductivity in a Cu–0.3Cr–0.5Zr alloy processed by ECAP. J Mater Sci 52, 305–313 (2017). https://doi.org/10.1007/s10853-016-0331-8

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  • DOI: https://doi.org/10.1007/s10853-016-0331-8

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