INTERNAL FRICTION OF SINGLE AND POLYVARIANT MARTENSITES OF Cu-Zn-Al

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Abstract
The alloys which exhibit a thermoelastic martensitic transformation are generally characterised by a high damping in the martensitic phase. In the case of 18R faulted martensites, two explanations can be proposed : the movement of the interfaces between the variants or the movement of the partial dislocations present at the edge of the faults. These movements can be both detected by electron microscopy. To cut between these two hypothesis, the internal friction of a single then polyvariant martensite has been measured. A very low internal friction is obtained in the martensite single variant whereas high internal friction is as usually obtained for the polyvariant one. This proves that the internal friction of martensite is probably due to the movement of interfaces between the variants

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