Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation
Smith, Richard J. and Li, Wenqi and Coulson, Jethro and Clark, Matt and Somekh, Michael G. and Sharples, Steve D. (2014) Spatially resolved acoustic spectroscopy for rapid imaging of material microstructure and grain orientation. Measurement Science and Technology, 25 (5). 055902. ISSN 1361-6501
Official URL: http://iopscience.iop.org/0957-0233/25/5/055902
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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