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Cyclic Deformation of Thin Films inside the Electron Microscope

机译:电子显微镜内薄膜的循环变形

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High purity silver and nickel films were obtained by vapor deposition onto a sodium chloride crystal in an ion pumped vacuum at a pressure greater than 10 to the -9th power Torr. Observations of the films in a Jem 150 electron microscope were made after floating the films off of the NaCl crystal and picking them up on a specimen grid while in the liquid. The electron micrographs showed dislocations, stacking faults and interference fringes present and that the films were not of uniform thickness. The results showed that metallic films could be obtained and that the attainment of films representative of the bulk material requires a refinement of the vapor deposition method under ultra-high vacuum conditions. A tensile device has been built to cyclically stress the films in the electron microscope and thereby study the motion of dislocations in the films and ultimately observe the fatigue crack. (Author)

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