On the Establishment of a Method for Characterization of Material Microstructure through Laser-based Resonant Ultrasound Spectroscopy

Journal Article · Tue Apr 01 00:00:00 EDT 2008 · IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control

DOI:https://doi.org/10.1109/TUFFC.2008.711· OSTI ID:932247

Reese, Stephen J; Telschow, Kenneth L; Hurley, David H

Non-contacting laser-based resonant ultrasound spectroscopy measurements were made on a polycrystalline sample of high purity copper. The frequencies and shapes of 40 of the first 50 resonant vibrational modes were determined. The sample’s elastic constants were estimated by two methods: 1) bulk wave velocities, and 2) orientation imaging microscopy to measure crystallite orientations in a representative area of the sample. Agreement between the two theoretical approaches and experiment is quite good – mode frequencies are each within 8% of one another with an average difference of 0.6% per mode – verifying the nearly isotropic condition of the sample. The close agreement demonstrates that applying orientation imaging microscopy in combination with resonant ultrasound spectroscopy is a promising approach to characterizing microstructure. The Q of the resonant peaks was also examined. The Q of the laser-generated and -detected resonant ultrasound spectrum was 30% higher than a contact resonant ultrasound spectrum produced by applying a piezoelectric transducer pair for excitation and detection. The non-contacting nature of a laser measurement allowed for a purer measurement of the intrinsic acoustic attenuation mechanisms (i.e., internal friction) within the sample, imparting less influence from extrinsic attenuation due to transducer contact with the sample.

• Research Organization: Idaho National Lab. (INL), Idaho Falls, ID (United States)
• Sponsoring Organization: DOE - SC
• DOE Contract Number: DE-AC07-99ID-13727
• OSTI ID: 932247
• Report Number(s): INL/JOU-07-13106; TRN: US0803488
• Journal Information: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control, Vol. 55, Issue 4
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACOUSTICS
ATTENUATION
COPPER
DETECTION
EXCITATION
INTERNAL FRICTION
LASERS
MICROSCOPY
MICROSTRUCTURE
ORIENTATION
SPECTROSCOPY
TRANSDUCERS
acoustic attenuation mechanisms
high purity copper polycrystalline sample
laser-based resonant ultrasound spectroscopy
microstructures