Mode-converted ultrasonic scattering in polycrystals with elongated grains

Andrea Arguelles, Christopher Kube, Ping Hu, Joseph A. Turner

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Elastic wave scattering is used to study polycrystalline media for a wide range of applications. Received signals, which include scattering from the randomly oriented grains comprising the polycrystal, contain information from which useful microstructural parameters may often be inferred. Recently, a mode-converted diffuse ultrasonic scattering model was developed for evaluating the scattered response of a transverse wave from an incident longitudinal wave in a polycrystalline medium containing equiaxed single-phase grains with cubic elastic symmetry. In this article, that theoretical mode-converted scattering model is modified to account for grain elongation within the sample. The model shows the dependence on scattering angle relative to the grain axis orientation. Experimental measurements were performed on a sample of 7475-T7351 aluminum using a pitch-catch transducer configuration. The results show that the mode-converted scattering can be used to determine the dimensions of the elongated grains. The average grain shape determined from the experimental measurements is compared with dimensions extracted from electron backscatter diffraction, an electron imaging technique. The results suggest that mode-converted diffuse ultrasonic scattering has the potential to quantify detailed information about grain microstructure.

Original languageEnglish (US)
Pages (from-to)1570-1580
Number of pages11
JournalJournal of the Acoustical Society of America
Volume140
Issue number3
DOIs
StatePublished - Sep 1 2016

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polycrystals
ultrasonics
scattering
transverse waves
longitudinal waves
wave scattering
elastic waves
imaging techniques
elongation
transducers
elastic scattering
electron diffraction
aluminum
microstructure
symmetry
configurations
Waves
electrons

All Science Journal Classification (ASJC) codes

  • Arts and Humanities (miscellaneous)
  • Acoustics and Ultrasonics

Cite this

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Mode-converted ultrasonic scattering in polycrystals with elongated grains. / Arguelles, Andrea; Kube, Christopher; Hu, Ping; Turner, Joseph A.

In: Journal of the Acoustical Society of America, Vol. 140, No. 3, 01.09.2016, p. 1570-1580.

Research output: Contribution to journalArticle

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