Number of the records: 1
Measurement of coherent surface acoustic wave attenuation in polycrystalline aluminum
- 1.
SYSNO ASEP 0500167 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Measurement of coherent surface acoustic wave attenuation in polycrystalline aluminum Author(s) Ryzy, M. (AT)
Grabec, Tomáš (UJF-V) ORCID
Osterreicher, J. A. (AT)
Hettich, M. (AT)
Veres, I. A. (US)Number of authors 5 Article number 125019 Source Title AIP Advances. - : AIP Publishing
Roč. 8, č. 12 (2018)Number of pages 14 s. Publication form Print - P Language eng - English Country US - United States Keywords ultrasonic frequencies ; magnitude ; scattering Subject RIV BM - Solid Matter Physics ; Magnetism OECD category Condensed matter physics (including formerly solid state physics, supercond.) R&D Projects EF16_013/0001794 GA MŠMT - Ministry of Education, Youth and Sports (MEYS) Institutional support UJF-V - RVO:61389005 UT WOS 000454615100020 EID SCOPUS 85059315700 DOI 10.1063/1.5074180 Annotation Attenuation of Rayleigh-type surface acoustic waves induced by grain-boundary scattering is studied experimentally and theoretically by an effective medium approach. A frequency domain opto-acoustic laboratory setup, capable of measuring a coherent Rayleigh wave response by emulating an ensemble average via spatial averaging, is presented. Measurements are conducted on polycrystalline aluminum at ultrasonic frequencies from 10 MHz to 130 MHz. A constant effective phase velocity of 2893 m s(-1) is found below 80 MHz. The effective attenuation coefficient varies in the whole frequency range by nearly two orders of magnitude, and shows classical scattering behavior, comprising stochastic and geometric scattering regimes. A semi-analytical attenuation model is presented, valid below the geometric limit. The model incorporates the material's spatial two-point correlation function obtained from metallurgical micrographs. Comparisons to experimentally obtained attenuation coefficients show good quantitative agreement, with differences in the frequency power-law dependence. This study attempts to elucidate microstructure induced surface acoustic wave attenuation experimentally by means of a statistical approach. The proposed method and the obtained findings contribute to the understanding of wave propagation in heterogeneous media, and promote the use of surface acoustic waves in non-destructive microstructure characterization. Workplace Nuclear Physics Institute Contact Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228 Year of Publishing 2019
Number of the records: 1