Observation of dislocation disappearance in aluminum thin films and consequences for thin film properties

P. Muellner, E. Arzt

Research output: Contribution to journalConference articlepeer-review

28 Scopus citations

Abstract

Dislocation structures in Al-Cu thin films have been studied by transmission electron microscopy (TEM). We have observed that the contrast of interface dislocations disappears in the electron beam. We assume that the contrast dissolution is due to the spreading of the dislocation core at the crystalline/amorphous interface or due to a diffusive movement of the dislocation through the oxide. In any case, the relaxation is assumed to be controlled by irradiation induced diffusion. As a consequence, the short range stresses and at least partly also the long range stresses of the dislocations relax. This relaxation changes the interaction force between dislocations and may thus significantly affect the mechanical properties of thin films. It is concluded that interaction between interface dislocations may not be responsible for the high temperature strength of aluminum films.

Original languageEnglish
Pages (from-to)149-154
Number of pages6
JournalMaterials Research Society Symposium Proceedings
Volume505
StatePublished - 1998
EventProceedings of the 1997 MRS Fall Meeting - Boston, MA, USA
Duration: 30 Nov 19974 Dec 1997

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