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Influence of alloying with hafnium on the microstructure, texture, and properties of Cu–Cr alloy after equal channel angular pressing

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Abstract

Equal channel angular pressing (ECAP) results in grain refinement of the Cu–0.7 % Cr alloy with an average grain size of 320 ± 73 nm. Addition of hafnium leads to a further decrease of average grain size down to 225 ± 82 nm and to an increase of the fraction of high angle boundaries from 40 to 53 %. The microhardness of the Cu–0.7 % Cr–0.9 % Hf alloy is higher than that of the Cu–0.7 % Cr alloy in the quenched state, after ECAP followed by annealing in the temperature interval of 400–550 °C during which aging occurs. Compared with the quenched state, ECAP increases the tensile strength of the Cu–0.7 % Cr and Cu–0.7 % Cr–0.9 % Hf alloy by a factor of 2.3 and 2.2, respectively. Aging leads to additional strengthening. Compared with the Cu–0.7 % Cr alloy, the strength of the Cu–0.7 % Cr–0.9 % Hf alloy after ECAP and after subsequent aging is 1.3 and 1.5 times higher, respectively.

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Acknowledgements

The authors gratefully acknowledge the financial support of the Ministry of Education and Science of Russian Federation provided in the framework of the Program aimed to increase the competitiveness of the National University of Science and Technology “MISIS” and the Russian Foundation for Basic Research (Project13-08-00102).

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Authors and Affiliations

  1. A.A. Baikov Institute of Metallurgy and Materials Science of RAS, Moscow, Russia

    Daria Shangina, Yulia Maksimenkova, Natalia Bochvar, Vladimir Serebryany & Sergey Dobatkin

  2. Laboratory of Hybrid Nanostructured Materials, National University of Science and Technology “MISIS”, Moscow, Russia

    Daria Shangina, Alexei Vinogradov & Sergey Dobatkin

  3. Ufa State Aviation Technical University, Ufa, Russia

    Georgy Raab

  4. Norwegian University of Science and Technology NTNU, Trondheim, Norway

    Alexei Vinogradov

  5. Technische Universität Dresden, Dresden, Germany

    Werner Skrotzki

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  1. Daria Shangina
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  2. Yulia Maksimenkova
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  3. Natalia Bochvar
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  4. Vladimir Serebryany
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  5. Georgy Raab
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  6. Alexei Vinogradov
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  7. Werner Skrotzki
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  8. Sergey Dobatkin
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Correspondence to Daria Shangina.

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Shangina, D., Maksimenkova, Y., Bochvar, N. et al. Influence of alloying with hafnium on the microstructure, texture, and properties of Cu–Cr alloy after equal channel angular pressing. J Mater Sci 51, 5493–5501 (2016). https://doi.org/10.1007/s10853-016-9854-2

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  • DOI: https://doi.org/10.1007/s10853-016-9854-2

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