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Increase in the Strength and Electrical Conductivity of a Cu–0.8Hf Alloy after Rotary Swaging and Subsequent Aging

  • STRUCTURE AND PROPERTIES OF THE DEFORMED STATE
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Russian Metallurgy (Metally) Aims and scope

Abstract—The structure, electrical conductivity, and mechanical properties (including fatigue strength) of a Cu–0.8% Hf alloy after rotary swaging (RS) at various strains and subsequent aging are investigated. RS is shown to cause the formation of a microstructure elongated in the deformation direction. When the strain increases, the average grain width decreases and grains acquire an increasingly elongated shape. After RS at ε = 2.77, the formation of an ultrafine-grained structure with an average subgrain size of 173 ± 12 nm is observed inside the elongated grains. When the strain increases, the strength of the alloy increases and the plasticity decreases. Subsequent aging causes an increase in the strength of the quenched alloy and the alloy after RS at ε = 0.58 and 1.39; hardening is absent after RS at ε = 2.77. In all cases, aging increases the electrical conductivity of the alloy as a result of the decomposition of a supersaturated solid solution and the precipitation of the Cu5Hf phase. The best combination of the mechanical and functional properties is achieved after RS at ε = 2.77 and subsequent aging at 475°C for 2 h: the ultimate tensile strength is 461 ± 28 MPa, the ductility is 12.5 ± 2.4%, the fatigue limit is 325 MPa, and the electrical conductivity is 90.4 ± 1.9% IACS.

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ACKNOWLEDGMENTS

The studies of the fracture surfaces of fatigue failure of the samples after fatigue tests were conducted using the research equipment of the Shared Facility Center at P.N. Lebedev Physical Institute of the Russian Academy of Science.

Funding

This work was carried out within the framework of state task no. 075-01176-23-00.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119334, Moscow, Russia

    N. S. Martynenko, N. R. Bochvar, O. V. Rybalchenko, D. V. Prosvirnin, A. G. Kolmakov, M. M. Morozov, V. S. Yusupov & S. V. Dobatkin

  2. Lebedev Physical Institute, Russian Academy of Sciences, 119991, Moscow, Russia

    G. V. Rybalchenko

  3. National University of Science and Technology “MISiS, 119049, Moscow, Russia

    S. V. Dobatkin

Authors
  1. N. S. Martynenko
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  2. N. R. Bochvar
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  3. O. V. Rybalchenko
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  4. D. V. Prosvirnin
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  5. G. V. Rybalchenko
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  6. A. G. Kolmakov
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  7. M. M. Morozov
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  8. V. S. Yusupov
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  9. S. V. Dobatkin
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Corresponding author

Correspondence to N. S. Martynenko.

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The authors declare that they have no conflicts of interest.

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Translated by K. Shakhlevich

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Martynenko, N.S., Bochvar, N.R., Rybalchenko, O.V. et al. Increase in the Strength and Electrical Conductivity of a Cu–0.8Hf Alloy after Rotary Swaging and Subsequent Aging. Russ. Metall. 2023, 466–474 (2023). https://doi.org/10.1134/S0036029523040158

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  • DOI: https://doi.org/10.1134/S0036029523040158

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