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The Influence of Porosity on the Statistical Amplitude Distribution of Backscattered Ultrasonic Pulses in Reactive Cast Metal–Matrix Composites

The Influence of Porosity on the Statistical Amplitude Distribution of Backscattered Ultrasonic... In this work, we study the influence of the local porosity in isotropic reactive cast particulate reinforced metal–matrix composites on the statistical amplitude distribution of backscattered broadband pulses of longitudinal ultrasonic waves. A special laser optoacoustic transducer is employed for this purpose, which makes it possible to achieve laser excitation and piezoelectric detection of ultrasound by one-side access to a sample or product. Two series of in-situ reactive cast aluminum–matrix composites were studied: reinforced solely with the Al3Ti intermetallic particles (volumetric contents 0.04–0.115) and with combination of Al3Ti and synthetic diamond nanoparticles (volumetric content 0.002). The last accelerate reactive synthesis of Al3Ti particles and lead to modification of their shape and sizes. For both series of composites, the amplitude distribution of backscattered ultrasonic pulses has been approximated with the Gaussian probability distribution applicable for statistics of large number of independent random variables. The empirical dependence of the half-width of this distribution on the local porosity in composites of two series has been fitted by the same function close to the linear one regardless the size and content of reinforcing particles. This functional relationship can be used for quantitative evaluation of the local porosity of the composite material both at its manufacturing stage and during service of composite parts and products. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Acoustical Physics Springer Journals

The Influence of Porosity on the Statistical Amplitude Distribution of Backscattered Ultrasonic Pulses in Reactive Cast Metal–Matrix Composites

Acoustical Physics , Volume 67 (1) – Mar 10, 2021

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Publisher
Springer Journals
Copyright
Copyright © Pleiades Publishing, Ltd. 2021. ISSN 1063-7710, Acoustical Physics, 2021, Vol. 67, No. 1, pp. 47–55. © Pleiades Publishing, Ltd., 2021. Russian Text © The Author(s), 2021, published in Akusticheskii Zhurnal, 2021, Vol. 67, No. 1, pp. 55–64.
ISSN
1063-7710
eISSN
1562-6865
DOI
10.1134/S1063771021010073
Publisher site
See Article on Publisher Site

Abstract

In this work, we study the influence of the local porosity in isotropic reactive cast particulate reinforced metal–matrix composites on the statistical amplitude distribution of backscattered broadband pulses of longitudinal ultrasonic waves. A special laser optoacoustic transducer is employed for this purpose, which makes it possible to achieve laser excitation and piezoelectric detection of ultrasound by one-side access to a sample or product. Two series of in-situ reactive cast aluminum–matrix composites were studied: reinforced solely with the Al3Ti intermetallic particles (volumetric contents 0.04–0.115) and with combination of Al3Ti and synthetic diamond nanoparticles (volumetric content 0.002). The last accelerate reactive synthesis of Al3Ti particles and lead to modification of their shape and sizes. For both series of composites, the amplitude distribution of backscattered ultrasonic pulses has been approximated with the Gaussian probability distribution applicable for statistics of large number of independent random variables. The empirical dependence of the half-width of this distribution on the local porosity in composites of two series has been fitted by the same function close to the linear one regardless the size and content of reinforcing particles. This functional relationship can be used for quantitative evaluation of the local porosity of the composite material both at its manufacturing stage and during service of composite parts and products.

Journal

Acoustical PhysicsSpringer Journals

Published: Mar 10, 2021

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