Measuring the single-crystal elastic constants of polycrystalline materials has important engineering applications. This information is critical for predicting the macroscopic mechanical behaviour of materials and designing new materials with tailored mechanical properties.
A new method for measuring the single-crystal elastic stiffness matrix of polycrystalline materials is presented. It builds on the capabilities of SRAS, a laser ultrasound technique for measuring the surface acoustic wave (SAW) velocity of a material. Combining measurements from multiple acoustic propagation directions with the elastic constants from literature, it is possible to determine the grains’ orientation. This paper details recent work for measuring the single-crystal elastic constants of polycrystalline materials combining SRAS with an inverse solver to extract both the orientation and elasticity from the SAW measurements.
Spatially Resolved Acoustic Spectroscopy has established itself as a powerful material characterisation technique capable of imaging the microstructure of a number of engineering alloys and semiconductor materials. The technique non-destructively utilises laser ultrasonics to robustly, rapidly, and repeatably measure controlled surface acoustic wave velocities – these can be mapped to image material grain contrasts (SRAS).
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