Mean velocity of edge and screw dislocation groups in neutron-irradiated copper single crystals†

During deformation of n-irradiated Cu single crystals (n-dose 2.6 × 1018 cm−2) in the yield region at room temperature the development of slip bands on several surfaces around the crystal is recorded by high-speed cinematography. From microphotometric evaluation of the films (rate of growth of slip bands in length and in height) the mean velocity of dislocation groups, the distances of dislocations in the moving groups, and their average angle to the crystal surface is obtained. Velocities of screw (v⊙) and edge (v⊥) dislocation groups at different surfaces indicate an effect of the surface (“image forces”). An increase of deformation rate by a factor of 21 causes an increase of v⊙ and v⊥ by only a factor of six. Without surface effects v⊙/v⊥ ≈ 4. Wahrend der Verformung von n-bestrahlten Cu-Einkristallen (n-Dosis 2,6 × 1018 cm−2) im Fliesbereich bei Raumtemperatur wird die Entwicklung von Gleitbandern auf mehreren Flachen rund um den Kristall mit Hochfrequenz-Kinematographie registriert. Die mikrophotometrische Auswertung der Filme (Wachstumsgeschwindigkeit der Gleitbander in die Lange und Hohe) ergibt die mittlere Geschwindigkeit der Versetzungsgruppen, die Versetzungsabstande in bewegten Gruppen und ihren mittleren Winkel gegen die Kristalloberflache. Die Geschwindigkeiten von Schrauben- und Stufenversetzungsgruppen (v⊙ bzw. v⊥) lassen einen Einflus der Oberflache („Bildkrafte”) erkennen. Eine Zunahme der Dehngeschwindigkeit um den Faktor 21 hat eine Zunahme von v⊙ und v⊥ nur um den Faktor sechs zur Folge. Ohne Oberflacheneffekt ist v⊙/v⊥ ≈ 4.

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