Pressure-Dependent Shear Modulus of Polycrystalline Al Studied by Electromagnetic Acoustic Resonance
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概要
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We have succeeded to electromagnetically excite and detect MHz-frequency-range ultrasound shear wave in polycrystalline Al under high pressures. The noncontact thickness-resonant electromagnetic acoustic resonance technique enables us to excite and detect polarized pure shear waves in an Al polycrystalline specimen in a pressurizing liquid through the Lorentz-force mechanism. Shear-mode resonance spectra have been successfully obtained up to 0.55 GPa at ambient temperature. Quasiharmonic analysis for the pressure dependence of shear modulus yields the zone-center shear-mode Grüneisen parameter $\gamma_{\text{S}}$ to be 2.683, which agrees well with previously reported values calculated from the third-order elastic constants.
- 2008-03-25
著者
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Kagayama Tomoko
Center For Quantum Science And Technology Under Extreme Conditions Osaka University
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Ogi Hirotsugu
Graduate School Of Engineering Science Osaka University
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Hirao Masahiko
Graduate School Of Engineering Sci. Osaka Univ.
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Tarumi Ryuichi
Graduate School Of Engineering Science Osaka University
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Kawasaki Yasunori
Graduate School Of Engineering Science Osaka University
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Kagayama Tomoko
Center for Quantum Science and Technology under Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Kawasaki Yasunori
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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Tarumi Ryuichi
Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan
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