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The present paper will present an overview of the current state-of-the-art of the use of ultrasonic attenuation as a nondestructive technique for materiales characterization. Examples will be given as to how proper choice of experimental parameters permit ultrasonic attenuation measurements to be used to study grain size, plastic deformation, and impurity concentration. Some comments will be made as to new techniques using laser beam generation and detection which afford the possibility of making ultrasonic attenuation measurements not possible by more conventional means and thereby expanding the practical usefulness of ultrasonic attenuation non-destructive materials characterization

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