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Evaluating elongated grains with diffuse ultrasonic double scattering and rectangular transducers.

Feng Chen1, Siqi Chen1, Yongfeng Song1

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Summary
This summary is machine-generated.

This study introduces a new method using rectangular ultrasonic transducers to accurately measure the size and elongation of grains in polycrystalline materials. The findings enable more precise material characterization through advanced diffuse scattering analysis.

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Area of Science:

  • Materials Science
  • Non-destructive Testing
  • Acoustics

Background:

  • Diffuse scattering of ultrasound is key for evaluating polycrystal microstructure, including grain size and elongation.
  • Existing models often use circular transducers, limiting sensitivity to asymmetric, elongated grains.
  • Rectangular transducers offer a novel approach to capture additional microstructural information.

Purpose of the Study:

  • To modify existing single scattering response (SSR) and double scattering response (DSR) models for rectangular transducers.
  • To investigate the interaction between asymmetric sound fields and elongated grains in ultrasonic backscattering.
  • To develop a more accurate method for characterizing elongated grain structures.

Main Methods:

  • Modified SSR and DSR models for rectangular transducers, treating the far-field as an elliptical transducer.
  • Derived an equivalent single Gaussian beam model using amplitude and beamwidth equivalence coefficients.
  • Transformed the spatial correlation function of elongated grains into the wavenumber domain.

Main Results:

  • Developed SSR and DSR models revealing the effects of asymmetric sound fields and elongated grains on ultrasonic backscattering.
  • Experimental validation on cold-rolled aluminum demonstrated accurate evaluation of elongated grain dimensions.
  • Measured grain sizes were 1086±8, 90±4, and 10±1 μm in x, y, and z directions, closely matching metallographic results.

Conclusions:

  • The modified models and rectangular transducer approach provide a powerful tool for characterizing anisotropic microstructures.
  • This method enhances the precision of ultrasonic non-destructive evaluation for materials with elongated grains.
  • The study validates the effectiveness of using asymmetric sound fields for detailed material analysis.