Experimental techniques for the plastic deformation of metal foils in the electron microscope
Several investigators have found that individual dislocations are visible when suitable thin metal foils are viewed using transmission electron microscopy (1–3). The dislocations can be made to move through the films under the action of stresses, produced by the local heating effect of a high intensity electron beam. This experiment, is particularly successful when carried out with films which have a high dislocation density as produced by plastic deformation prior to the electrolytic polishing. In the present investigation a different technique is used; namely, previously undeformed films of about 1000 Å in thickness are strained in the electron microscope. In this way it is possible to study the behavior of dislocations at all strains (4). In the following, the experimental aspects of such an investigation are described.
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