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Abstracts
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Authors
Hirao, M; Ogi, H
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Title
Electromagnetically excited Acoustic Resonance for Evaluating Attenuation Coefficient and Grain Size in Polycrystalline Metals
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Journal
App Phys Lett 64 (17) 25 April 1994 pp 2217-2219
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Abstract:An experiment on an acoustic resonance spectrometer for evaluating attenuation characteristics and grain size of polycrystalline metals is described. A noncontacting electromagnetic acoustic transducer is excited to establish a shear-wave ringing in a plate sample and the amplitude spectrum is obtained by sweeping the driving rf frequency through the resonances. At each resonance the time constant, or the attenuation coefficient, whose frequency dependence is finally related to the w\average grain size through the Rayleigh scattering theory. This nondestructive evaluation agreed with the photomicrographic examination to an accuracy of 6 micrometers for a relatively narrow distribution of grain size in low carbon steels.
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