Abstract
By measurement of the low frequency internal friction spectrum, the different mechanisms which control the dislocation mobility, present very similar peaks. In the same way the microdeformation curves measured by the ultrasonic methods do not present great differences between different mechanisms. To avoid this indetermination on the mechanisms, a new technique has been developed (1). It consists in measuring the attenuation Ɗα and the relative change Ɗt/t of propagation time of ultrasonic waves in a sample, with a permanent sinusoidal low frequency applied stress (σ). Curves Ɗα(σ) and Ɗt/t(σ), each one measured during one cycle of the stress, are drawn as a function of time or temperature. These curves present different shapes and different evolutions depending on the involved mechanism. Some experimental results obtained by this technique are presented at this conference in two other papers (2, 3). In this paper, the measuring device will be presented.
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