Nondestructive characterization of polycrystalline 3D microstructure with time-domain Brillouin scattering

We employ gigahertz frequency ultrasonic waves to non-invasively image grain microstructure in polycrystalline ceria. This technique, termed time-domain Brillouin scattering (TDBS), is a pump-probe technique that launches and monitors ultrasonic waves as they propagate into the sample. We demonstrat...

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Bibliographic Details
Published in:Scripta materialia 2019-06, Vol.166 (C), p.34-38
Main Authors: Wang, Yuzhou, Hurley, David H., Hua, Zilong, Sha, Gaofeng, Raetz, Samuel, Gusev, Vitalyi E., Khafizov, Marat
Format: Article
Language:English
Subjects:
Acoustics
Engineering Sciences
Grain boundary
Materials
Mechanical & acoustical properties
Mechanics
Microstructure
optics, phonons, thermal conductivity, nuclear, defects, magnetism and spin physics, mesoscale science, mesostructured materials
Physics
Ultrafast pump-probe spectroscopy
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Summary:We employ gigahertz frequency ultrasonic waves to non-invasively image grain microstructure in polycrystalline ceria. This technique, termed time-domain Brillouin scattering (TDBS), is a pump-probe technique that launches and monitors ultrasonic waves as they propagate into the sample. We demonstrate TDBS's capability to image microstructure by measuring mode and depth dependent acoustic velocities. The technique provides sufficient contrast to identify grains and offers means to reconstruct subsurface grain boundary's location. The results compare closely with electron backscatter diffraction measurement. This work expands the application of TDBS to 3D structural imaging and offers new route for the nondestructive characterization of grain boundary. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2019.02.037