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Acoustic Emission during Plastic Deformation of Pb–Sn Alloys

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Abstract

Acoustic emission activity under static loading of Pb–Sn alloys was studied in a wide range of alloy element concentrations. The strain rate dependences of the acoustic emission count rate were plotted in mechanical tests. The obtained experimental data revealed a significant change in the type of recorded acoustic emission signals depending on the alloy structure, determined by the content of alloy elements. With a low tin content, the detected acoustic emission is generated by the dislocation fluxes localized at grain boundaries under the conditions of a large contribution of grain boundary sliding to plastic deformation. An increase in the β-phase content leads to a sharp decrease in acoustic emission due to the formation of eutectic regions around the α-phase grains, which inhibit dislocation processes. For eutectic alloys, the maximum acoustic emission was detected in the transition to intense plastic flow. Plastic deformation in this case was determined by the specific mesostructure of the alloy and occurred through the motion of individual eutectic colonies formed by alternating layers of the α and β phases. Strong acoustic emission activity in the hypereutectic region was observed with increasing tin content, due to increasing contribution of the β phase to acoustic emission. It was shown that qualitative differences in the mesostructure of Pb–Sn alloys manifested with changes in the element contents trigger various dominant mechanisms of plastic deformation, due to which the acoustic emission type changes markedly in the loaded alloy.

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Authors and Affiliations

  1. Altai State University, 656049, Barnaul, Russia

    D. S. Salita & V. V. Polyakov

  2. Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, 634055, Tomsk, Russia

    V. V. Polyakov

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  1. D. S. Salita
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  2. V. V. Polyakov
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Correspondence to D. S. Salita.

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Russian Text © The Author(s), 2019, published in Fizicheskaya Mezomekhanika, 2020, Vol. 23, No. 2, pp. 84–93.

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Salita, D.S., Polyakov, V.V. Acoustic Emission during Plastic Deformation of Pb–Sn Alloys. Phys Mesomech 23, 593–600 (2020). https://doi.org/10.1134/S1029959920060156

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  • DOI: https://doi.org/10.1134/S1029959920060156

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