Abstract
Broadband longitudinal pressure pulses induced by 5 ns laser pulse were used to evaluate bulk nickel with gradually changing microstructure from polycrystalline to ultrafine grain microstructure. This microstructure was generated by severe plastic deformation using the high pressure torsion method. A permanent cylindrical magnet and a pancake coil were attached at one side of the nickel specimen, allowing the detection of magnetic field variations induced by probe pressure pulse generated at the opposite side. The ultrafine grain structure demonstrated lower attenuation in comparison with polycrystalline microstructure where the scattering of the ultrasound was significant. In cases of acoustically free and impedance border the spectra of the primary pulses covered the range from 5 MHz up to 200 MHz.
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