Plastic Behaviour of Thin Films of Gold Formed by Vacuum Evaporation

概要

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Plasticity of thin crystals has been studied on single crystalline films of gold of of about 1000Å in thickness, prepared by vacuum deposition. The defor mation of films was made by stretching a substrate (Mylar) on which the films were fixed, and then examined in an electron microscope. When the stress was applied in <100> direction, extension of stacking faults and/or of thin twins resulted. While, under the stress in <110> direction, mechanical twins up to several microns in breadth were produced. In the broadened twin bands, slipping and secondary twinning were very active resulting in parting of the films, whereas slip in the matrix was only subsidiary. The mode of deformation is interpreted in terms of the resolved shear stress for each partial dislocation, which borders the fault, and in taking account of the effect of intersection between extended faults. The estimation of twinning stress does not conflict with the successive nucleation of twin dislocations.
社団法人日本物理学会の論文
1968-12-05