Infoscience

Thesis

Mesure du frottement intérieur de l'or écroui et irradié aux neutrons sur une installation travaillant dans le domaine du kilohertz

The author studies properties of the Bordoni peak in 99,999 % gold. The following features are considered : influence of type and rate of coldwork on relaxation strength. After traction coldwork, the height of the Bordoni peak is roughly proportional to the rate of plastic deformation, relaxation features. The relaxation energies and attempt frequencies of the Bordoni peak are determined for poly — and single crystals. The broadening of experimental peaks is studied, effect of dislocation pinning on the Bordoni peak. One shows that the experience leads to a relation : Qmax-1   Λl2 where Qmax-1 is the height of the peak, Λ the dislocation density and l the mean loop length of dislocations which are implied in the phenomenon.

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