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Acoustoplastic effect and internal friction of aluminum single crystals in various deformation stages

  • Defects. Dislocations. Physics of Strength
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Abstract

The dependences of the acoustoplastic effect and the internal friction on the oscillatory strain amplitude are measured in various deformation stages of low-purity aluminum single crystals. It is discovered that the acoustoplastic effect is observed not only in the macroscopic plastic region of the stress-strain diagram, but also for microplastic deformation in the “elastic” loading and unloading stages. The sign of the effect reverses during unloading. An increase in the strain rate leads to enhancement of the acoustoplastic effect and the absorption of the energy of ultrasonic vibrations causing this effect with a frequency of about 100 kHz. It is concluded that the acoustoplastic effect observed during both macro-and microplastic deformation is caused by the irreversible high-speed motion of dislocations through the long-range stress field of the other dislocations after breaking through the Cottrell atmospheres.

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Authors and Affiliations

  1. A. F. Ioffe Physicotechnical Institute, Russian Academy of Sciences, 194021, St. Petersburg, Russia

    K. V. Sapozhnikov & S. B. Kustov

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  1. K. V. Sapozhnikov
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  2. S. B. Kustov
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Fiz. Tverd. Tela (St. Petersburg) 39, 1794–1800 (October 1997)

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Sapozhnikov, K.V., Kustov, S.B. Acoustoplastic effect and internal friction of aluminum single crystals in various deformation stages. Phys. Solid State 39, 1601–1606 (1997). https://doi.org/10.1134/1.1129906

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  • DOI: https://doi.org/10.1134/1.1129906

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