Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation

Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation

Measuring the grain structure of aerospace materials is very important to understand their mechanical properties and in-service performance. Spatially resolved acoustic spectroscopy is an acoustic technique utilizing surface acoustic waves to map the grain structure of a material. When combined with...

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Bibliographic Details
Main Authors: Smith, Richard J., Li, Wenqi, Coulson, Jethro, Clark, Matt, Somekh, Michael G., Sharples, Steve D.
Format: Article
Published: IOP Publishing 2014
Subjects:
surface acoustic waves
material characterization
laser ultrasound
grain orientation
Online Access:https://eprints.nottingham.ac.uk/2817/
Description
Summary:Measuring the grain structure of aerospace materials is very important to understand their mechanical properties and in-service performance. Spatially resolved acoustic spectroscopy is an acoustic technique utilizing surface acoustic waves to map the grain structure of a material. When combined with measurements in multiple acoustic propagation directions, the grain orientation can be obtained by fitting the velocity surface to a model. The new instrument presented here can take thousands of acoustic velocity measurements per second. The spatial and velocity resolution can be adjusted by simple modification to the system; this is discussed in detail by comparison of theoretical expectations with experimental data.

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