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Ultrasonic backscatter from elongated grains using line focused ultrasound
Christopher M Kube1, Andrea P Arguelles2, Joseph A Turner2
1U.S. Army Research Laboratory, Weapons and Material Research Directorate, 4600 Deer Creek Loop, Aberdeen Proving Ground, MD 21005-5069, USA.
Abstract:
Ultrasonic backscattering from polycrystalline materials with elongated grains is investigated. A normal incident line-focus transducer is employed such that refracted longitudinal and transverse waves are focused within the polycrystal and scatter at grain boundaries back to the transducer. A ray-based scattering model is developed to explain the dependence of the statistics of scattering measurements on grain elongation. The spatial variance of measured scattered signals from Al alloy (7475-T7) is compared to the model. This work promotes the ultrasonic backscatter technique for monitoring grain elongation of metals using one transducer with access to a single sample face.
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