Abstract
The mechanical properties of 6061 aluminum alloys can be enhanced by appropriate heat treatment, but strongly weakened due to over-aging treatment. In this work, the material properties of aged 6061 aluminum alloys are nondestructively evaluated using nonlinear Rayleigh waves. Nonlinear Rayleigh wave experiments are performed on these aluminum specimens through long distances (c.a. 150 mm) to measure the velocity, attenuation and nonlinear parameter simultaneously. The wave velocity is calculated using the time-of-flight method, and the attenuation coefficient is extracted using a data fitting method. By taking into account the effects of diffraction, attenuation and source nonlinearity, the nonlinear parameter is measured. The results show that the nonlinear parameters have a positive correlation with the hardness, which is associated with the precipitate sequence due to aging treatment. It is also found that the Rayleigh wave attenuation is an effective indicator for monitoring the changes of the material microstructures. A technique is developed for evaluating material properties using multiple parameters of nonlinear Rayleigh waves, and its efficacy is verified through experiments.
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