Abstract
Pure Mg plate cast by heated mold continuous casting method (O.C.C-Mg) have layer structure of the columnar crystals parallel to the casting direction. The acoustic proparties of O.C.C.-Mg is compared with that of pure Mg cast by conventional casting method (polycrystal Mg). One dimensional stress wave which formed the single pulse (stress pulse) was used for investigation of their properties. The stress wave was generated by a gas-gun and the stress wave was detected by strain gages. The amplitude and duration time of the stress wave dependence of the attenuation constants obtained from both peak value and energy of the strain are confirmed. Moreover, attenuation characteristics of the specimen after annealing is compared with that of specimen as cast to confirm the influence of the change in grain structure of O.C.C.-Mg and polycrystal-Mg by annealing on the attenuation characteristics. In addition, frequency distribution which is connected to attenuation of stress wave in O.C.C. or polycrystal Mg is studied by Fourier analysis.
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