The internal friction spectrum of deformed and/or neutron‐irradiated high‐purity iron is studied at a frequency of 0.5 Hz over the temperature range 4 to 470 K. It is found that the spectrum is very similar to those observed in other b.c.c. refractory metals. Thus, following the generally accepted classification of deformation peaks in b.c.c. metals, two peaks which originate from intrinsic dislocation relaxations are named α and γ; two other peaks arising from dislocation‐point‐defect interactions are called β1 and β2. This nomenclature is justified by a detailed interpretation of the experimental results, which is presented in a later paper (Part II).

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Les auteurs étudient les défauts ponctuels créés à 77 °K par irradiation aux neutrons dans du fer pollué. Utilisant simultanément des méthodes sensibles soit à leur réorientation, soit à leur concentration globale, ils mettent en évidence un processus d'agglomération des défauts élémentaires au niveau des stades I et II.