By C A English Affiliation: UKAEA Atomic Energy Research Establishment, Harwell. Metallurgy Div.; M L Jenkins; M A Kirk Affiliation: Oxford Univ. (UK). Dept. of Metallurgy and Science of Materials
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Extra resources for Characterisation of displacement cascade damage in Cu/sub 3/Au produced by fusion-neutron irradiation
Sample text
9. Amorphous zones in Si imaged in structure-factor contrast. These were produced by a process of direct-impact amorphization in an irradiation with 60 keV Bi2 ions. The image was obtained in a dark field under dynamical two-beam conditions, using ¯ The contrast of the amorphous zones arises from an effective local change in g = 022. foil thickness—see text for details. Note that in the transition region at the centre of the thickness fringe, some zones image as dark dots with a white centre. Figure taken from work by Howe et al (1980).
In niobium the black–white vector l lies midway between g and b . From Ohr (1979). this direction is elastically hard, and thus the black–white vector is rotated further ¯ Burgers vector than for an elastically isotropic material. 4). Holmes et al (1979) have made simulations of non-edge loops in molybdenum. 12. Dark-field simulated images of a loop with b = 12 [11 sg = 0. Here the loop normals n are designated n 3 if the loop is of edge type, or n 1 if the loop habit-plane is the original nucleation plane.
Simulations were made ¯ imaged of the images of edge loops with Burgers vector bb parallel to [1 11] in a diffraction vector gg = 002 with foil normal n = [110]. For a Frank loop in a hypothetical isotropic material, the computed image showed a black– white contrast with l rotated about 15 ◦ away from b in a direction towards g . Calculations for Frank loops in copper and nickel were made under identical diffraction conditions using the displacement fields of anisotropic elasticity. In both cases the effect of anisotropy was to ‘stretch’ the black–white contrast parallel to the Burgers vector b .