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Phase Transformations of 1.4 at % Cu–Al Binary Alloy at High Pressures and Temperatures

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Abstract—

Phase transformations of 1.4 at % Cu + 98.6 at % Al alloy have been studied at atmospheric pressure by differential scanning calorimetry and at a moderately high hydrostatic pressure (~100 MPa) by differential barothermal analysis. High pressure has been shown to raise the solvus (θ-Al2Cu + α-Al → α-(Al) solid-state transformation) temperature of the alloy relative to the equilibrium value obtained at atmospheric pressure. According to our estimate, the heat of solid-state θ-phase dissolution in the α-matrix at 100 MPa is four times that at atmospheric pressure. High-pressure crystallization has been shown to have a significant effect on the microstructure of the alloy, with a manyfold increase in the particle size of the θ-Al2Cu intermetallic phase.

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Funding

This work was supported by the Russian Federation Ministry of Science and Higher Education through the state research targets for the Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences (theme no. 007-00129-18-00) and the Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences (theme no. 01201353364) in the field of basic research.

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Authors and Affiliations

  1. Baikov Institute of Metallurgy and Materials Science, Russian Academy of Sciences, 119991, Leninskii pr. 49, Moscow, Russia

    A. G. Padalko, T. K. Akopyan, M. S. Pyrov & G. V. Talanova

  2. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 119991, Leninskii pr. 31, Moscow, Russia

    A. D. Izotov & A. V. Khoroshilov

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  1. A. G. Padalko
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  2. T. K. Akopyan
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  3. M. S. Pyrov
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  4. A. D. Izotov
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  5. A. V. Khoroshilov
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  6. G. V. Talanova
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Correspondence to A. G. Padalko.

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Translated by O. Tsarev

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Padalko, A.G., Akopyan, T.K., Pyrov, M.S. et al. Phase Transformations of 1.4 at % Cu–Al Binary Alloy at High Pressures and Temperatures. Inorg Mater 55, 908–914 (2019). https://doi.org/10.1134/S0020168519090115

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  • DOI: https://doi.org/10.1134/S0020168519090115

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