Ultrasonic velocities in anisotropic polycrystalline aggregates

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Abstract
The ultrasonic velocities in a polycrystalline aggregate of cubic crystals with orthorhombic symmetry are derived. Use is made of the formalism of Roe (1965, 1966) for treating the texture of polycrystalline aggregates. It is shown how information about the crystallite orientation distribution function can be derived from ultrasonic velocity measurements. This enables the construction of ultrasonic pole figures, which may be compared with those obtained from neutron diffraction. Application is made to the effect of texture on ultrasonic propagation in austenitic welds.