Abstract
The scattering of ultrasound by minority phases in polycrystalline metals is discussed. For discrete inclusions, the scattering theory of Ying and Truell describes well the attenuation of longitudinal waves. To treat the scattering by a second phase formed by segregation at a grain boundary, the scattering by a spherical shell with density and elastic constants different from those of the surrounding medium is developed. Reflection of ultrasound at this boundary is found to enhance the attenuation at low frequencies in agreement with experiments of Kamigaki. Application is made to the scattering by manganese sulphide in free-machining steel.
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