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Microstructure and Physical and Mechanical Properties of the Al90Gd10 Binary Alloy after Barothermal Treatment

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Abstract

Using the microindentation, X-ray diffraction, optical microscopy, and electron microscopy methods, the microstructure and bulk physical and mechanical properties (hardness, reduced elastic modulus, plasticity index, elastic recovery parameter) of two samples of the Al90Gd10 binary hypereutectic alloy (hereinafter, formula indices correspond to at %) are studied. The first sample is obtained by rapid cooling of the melt at a rate of 1000 degree/s at a high pressure of 10 GPa; the hardening temperature is 1800 K. The second sample is obtained by pressing the original sample with a high pressure of 5 GPa without melting. Compared to the intial sample, the microstructure of both samples is crushed and compacted. The structure of the initial sample is comprised of two equilibrium phases of α-Al and Al3Gd. In the sample prepared without melting, a phase with composition Gd55Al45 is found in addition to the α-Al and Al3Gd phases; in the sample prepared with melting, a phase with composition Al92Gd8 is found. Features of the structure morphology and changes in the phase composition of the samples prepared under high pressure lead to changes in the physical and mechanical properties of the studied alloy.

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Notes

  1. The comparison is carried out without consideration of the detected Gd55Al45 phase.

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ACKNOWLEDGMENTS

The authors express their sincere gratitude to V.I. Lad’yanov, Dr. Sci. (Phys.–Math.), and A.V. Vakhrushev, Dr. Sci. (Phys.–Math.), for valuable advices given in the course of study, as well as to I.K. Averkiev for his assistance in performing the elemental analysis of the samples.

Funding

This study was supported in part by the Russian Science Foundation (grant no. 22-22-00674). Electron microscopic studies and measurements of physical and mechanical properties were performed using the equipment of Center for Collective Use Center for Physical and Physicochemical Methods of Analysis and for Studying Properties and Characteristics of Surfaces, Nanostructures, Materials and Products at the Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences (Izhevsk, Russia). Samples under high pressure were prepared in the Institute for High Pressure Physics, Russian Academy of Sciences (Troitsk, Moscow, Russia).

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Authors and Affiliations

  1. Udmurt Federal Research Center, Ural Branch, Russian Academy of Sciences, Izhevsk, Russia

    S. G. Menshikova & A. A. Shushkov

  2. Institute for High Pressure Physics, Russian Academy of Sciences, Moscow, Troitsk, Russia

    V. V. Brazhkin

Authors
  1. S. G. Menshikova
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  2. A. A. Shushkov
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  3. V. V. Brazhkin
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Correspondence to S. G. Menshikova.

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Translated by O. Kadkin

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Menshikova, S.G., Shushkov, A.A. & Brazhkin, V.V. Microstructure and Physical and Mechanical Properties of the Al90Gd10 Binary Alloy after Barothermal Treatment. Phys. Solid State 64, 204–209 (2022). https://doi.org/10.1134/S1063783422050055

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