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• W2031509323 abstract "Measurements of ultrasonic attenuation and velocity changes are performed on 5N aluminium during the application of a low frequency bias stress. The characteristics of the attenuation-stress Δα = f(σ) loops are studied as a function of the repetition of loading, amplitude σm of loading stress, temperature, and pretreatment of the sample (prestrain, ageing time, or temperature). The results show that at least two kinds of dislocation-point defect breakaway mechanisms are involved in the experiments. Then a model is developed in order to calculate from the attenuation-stress hysteretic loop a low frequency internal friction decrement δα: peak events versus amplitude (δα = f(σm)) are thus observed, in good accordance with classical models of internal friction associated with breakaway of dislocations; the activation energy for depinning and the space between pinning points are deduced from these peaks and their evolutions are followed as a function of the pretreatment of the sample. In addition, although the internal friction decrements δα and δ, obtained directly from torsion pendulum, have some similar characteristics, a noticeable difference appears in the decrement levels which is especially explained by the characters of the solicitation in bias stress and torsion pendulum experiments, respectively, one sided and alternative; their effects are discussed in terms of dislocation mechanisms. Nous avons effectué des mesures de variation d'atténuation et de vitesse de propagation des ondes ultrasonores sur de l'Aluminium de pureté 5N sollicité par une contrainte basse fréquence. Les caractéristiques des cycles atténuation-contrainte Δα = f(σ) ont été étudiées en fonction des paramètres suivants: répétition et amplitude σm de la charge basse fréquence, température et traitement de l'échantillon (prédéformation, durée ou température du vieillissement). Les résultats expérimentaux s'expliquent par l'existence de deux types de mécanismes de désancrage. Ensuite nous avons développé un modèle permettant de calculer un coefficient de frottement interne δα à partir de l'hystérésis des cycles Δα = f(σ): ce calcul nous permet d'observer les pics, dans les spectres δα en fonction de l'amplitude σm, prévus par les modèles de frottement intérieur associé au désancrage thermiquement activé des dislocations; l'énergie d'activation pour le désancrage et l'intervalle entre points d'épinglage sont déduits de la position des pies, et leur évolution est discutée en fonction du traitement de l'échantillon. Finalement, la comparison de δα avec le frottement interne δ directement obtenu au pendule de torsion permet de constater que δα et δ présentent des caractéristiques similaires, excepté pour ce qui concerne le niveau de frottement intérieur: cette différence peut être attribuée principalement á la nature ondulée de la sollicitation basse fréquence utilisée dans nos expériences alors que la sollicitation mise en jeu dans le pendule de torsion est alternée, les mécanismes de désanerage alors mis en jeu étant différents." @default.
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• W2031509323 date "1985-08-01" @default.
• W2031509323 modified "2023-09-27" @default.
• W2031509323 title "Attenuation Stress Hysteresis Loops and Low-Frequency Internal Friction Associated with Thermomechanical Breakaway of Dislocations" @default.
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• W2031509323 doi "https://doi.org/10.1002/pssb.2221300218" @default.
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