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Noncontact ultrasonic spectroscopy on deforming polycrystalline copper: Dislocation damping and acoustoelasticity

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Abstract

Electromagnetic acoustic resonance (EMAR) is developed for the continuous measurement of the bulk-wave attenuation and phase velocities in a metal during a deformation process. The EMAR enables one to perform the noncontact measurement with extremely high sensitivity, in which the electromagnetic acoustic transducer (EMAT) generates and detects the bulk waves without any coupling material. The attenuation and velocity responses to the uniaxial stress were continuously recorded for 99.99 wt pct pure polycrystalline copper annealed at 200 °C for 1 hour before loading. We separated the velocity change due to the acoustoelastic effect from the contribution of the dislocation movement responding to the ultrasonic waves, and determined the pure third-order elastic constants. The shear wave showed much larger sensitivity to the dislocation mobility than the longitudinal wave. The discontinuous change in the incremental rate of the shear wave attenuation was observed in the elastic region, which was interpreted as the onset of the microscopic yielding.

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Authors and Affiliations

  1. the National Institute of Standards and Technology, 80303, Boulder, CO

    Hirotsugu Ogi (Guest Researcher)

  2. the Graduate School of Engineering Science, Osaka University, 560-8531, Toyonaka, Osaka, Japan

    Nagayoshi Suzuki (Graduate Student) & Masahiko Hirao (Professor)

Authors
  1. Hirotsugu Ogi
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  2. Nagayoshi Suzuki
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  3. Masahiko Hirao
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Ogi, H., Suzuki, N. & Hirao, M. Noncontact ultrasonic spectroscopy on deforming polycrystalline copper: Dislocation damping and acoustoelasticity. Metall Mater Trans A 29, 2987–2993 (1998). https://doi.org/10.1007/s11661-998-0206-y

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  • DOI: https://doi.org/10.1007/s11661-998-0206-y

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