Improvement of the Inversion Procedure in Resonant Ultrasound Spectroscopy for Generally Oriented, High Anisotropic Crystals

This paper presents an improvement of the resonant ultrasound spectroscopy (RUS) inverse procedure for determination of elastic properties of shape memory alloys. Reliable mode identification and, thus, a well-posed resonance inversion was achieved by evaluation of both resonance frequencies and eigenvibration modes using a scanning laser interferometry measurement The proposed approach was verified on determination of elastic constants and their temperature dependences of austenitic and martensitic phases of CuAlNi single crystals. The results on CuAlNi well correspond to our previous obtained by the pulse-echo measurement. The method can be applied for twinned structures, which enables investigation of naturally twinned shape memory alloys.