Interaction entre dislocations et défauts ponctuels créés par bombardement électronique dans l'argent

Abstract

2014 Le module élastique et le frottement intérieur de l'argent bombardé par des électrons à des températures comprises entre 9 K et 300 K ont été étudiés. Le premier stade d'ancrage des dislocations qui apparaît entre 25 K et 50 K est attribué à la migration de l'interstitiel libre à longue distance. D'autre part, lors d'irradiations à des températures au moins égales à 80 K, le peaking effect a été observé et ses caractéristiques sont étudiées en fonction de la température d'irradiation, de la déformation de mesure, du flux instantané de particules incidentes et de la nature des échantillons.Ces résultats sont ensuite confrontés aux diverses théories qui tentent d'expliquer le peaking effect.Abstract. 2014 The elastic modulus and internal friction of silver irradiated by electrons in the temperature range 9-300 K have been studied. The first pinning stage for the dislocations appears between 25-50 K and is attributed to the long range migration of free interstitials.Following irradiations at temperatures greater than or equal to 80 K, the peaking effect has been observed and its characteristics studied as a function of the temperature of irradiation, strain amplitude, instantaneous flux of electrons and the purity of the samples. The results are critically compared with the various theories of the peaking effect.

The interaction of point defects with dislocations in high-purity silver above room temperature

“…This experiment extends the low-temperature work done in silver by Girard and Minier (1978) to the range 310-570 K. This experiment provides further evidence of the peaking effect. The initial increase in the decrement, followed by a decrease was found at temperatures ranging from 310 K to 570 K with the largest peak occurring at 350 K.…”

“…However the lowest strain amplitude obtainable was limited by the decreasing stability of the signal. The disappearance of the peak was also not seen in the work done in silver (at lower temperatures) by Girard and Minier (1978) but was seen in copper by Lauzier et a1 (1975).…”