| Issue |
J. Phys. Colloques
Volume 44, Number C9, Décembre 1983
ECIFUAS-4Fourth European Conference on Internal Friction and Ultrasonic Attenuation in Solids / Quatrième Conférence Européenne sur le Frottement Intérieur et l'Atténuation Ultrasonore dans les Solides |
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|---|---|---|
| Page(s) | C9-325 - C9-330 | |
| DOI | https://doi.org/10.1051/jphyscol:1983946 | |
ECIFUAS-4
Fourth European Conference on Internal Friction and Ultrasonic Attenuation in Solids / Quatrième Conférence Européenne sur le Frottement Intérieur et l'Atténuation Ultrasonore dans les Solides
J. Phys. Colloques 44 (1983) C9-325-C9-330
DOI: 10.1051/jphyscol:1983946
1 Institut für Allgemeine Metallkunde und Metallphysik, RWTH Aachen, F.R.G.
2 IFF der Kfa, Jülich, F.R.G.
Fourth European Conference on Internal Friction and Ultrasonic Attenuation in Solids / Quatrième Conférence Européenne sur le Frottement Intérieur et l'Atténuation Ultrasonore dans les Solides
J. Phys. Colloques 44 (1983) C9-325-C9-330
DOI: 10.1051/jphyscol:1983946
EVALUATION OF MICROPOROSITY BY MHz-ATTENUATION MEASUREMENTS
H. Schmidt1, D. Lenz1 et W. Uelhoff21 Institut für Allgemeine Metallkunde und Metallphysik, RWTH Aachen, F.R.G.
2 IFF der Kfa, Jülich, F.R.G.
Abstract
Attenuation due to the scattering of ultrasound by micropores has been measured in Mn, S and Be doped copper single crystals grown by the Czochralski- and Bridgeman-techniques. After suppression of dislocation damping by γ-irradiation the attenuation αp due to pore scattering has been determined quantitatively in the frequency range 10 to 300 MHz. By fitting the theoretical αp(f)-dependence for spherical holes to the measured αp(f)-data we obtain the porosity P and the mean pore-diameter dp.