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Influence of Minor Aluminum Addition on the Superplastic Deformation of a Microduplex Cu-Zn Alloy

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Abstract

High residual porosity in superplastically deformed brass carries the risk of reducing the mechanical properties. Multicomponent brasses demonstrate lower residual porosity, associated with a lower grain size and more effective accommodation of grain boundary sliding. In this paper, the microstructural evolution of the surface and bulk structure of the binary brass and aluminum-bearing brass during steady-state superplastic deformation is compared. After superplastic deformation, dislocation pile-ups and dislocation walls are revealed in the α grains of both alloys, indicating the activation of the dislocation slip/creep mechanism. It is shown that aluminum reduces the contribution of grain boundary sliding along the phase boundaries from ~75 to ~30% and causes strain localization in the β-phase region with the formation of ultrafine grains with the size below ~300 nm as a result of dynamic recrystallization. Alloying with 0.4% Al reduces the flow stress by 20%, increases the relative elongation by a factor of 1.5, and decreases the fraction of residual porosity by a factor of 3. This leads to a much lower loss of room temperature strength in superplastically deformed alloys.

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Funding

The work was carried out under the grant of the President of the Russian Federation for leading scientific schools NSh-1752.2022.4. The TEM study of the structure was performed using the equipment of the Materials Science and Metallurgy CUC funded by the Ministry of Education and Science of the Russian Federation under the Government statement of work No. 075-15-2021-696.

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Authors and Affiliations

  1. MISIS University of Science and Technology, 119049, Moscow, Russia

    O. A. Yakovtseva, P. K. Kaboyi, A. V. Irzhak & A. V. Mikhaylovskaya

  2. Institute of Microelectronics Technology and High-Purity Materials, Russian Academy of Sciences, 142432, Chernogolovka, Russia

    A. V. Irzhak

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Yakovtseva, O.A., Kaboyi, P.K., Irzhak, A.V. et al. Influence of Minor Aluminum Addition on the Superplastic Deformation of a Microduplex Cu-Zn Alloy. Phys Mesomech 26, 533–541 (2023). https://doi.org/10.1134/S1029959923050065

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