Structure determination and structure refinement of Al2CuMg precipitates by quantitative high-resolution electron microscopy.
The structure of the S-phase (Al2CuMg) precipitate in an Al matrix has been determined by using a combination of image processing, quantitative image comparison, and automatic refinement of imaging and structural parameters. A method for comparing images with unknown origin relationship while quickly estimating a possible translation of the origin is outlined. The optimization algorithm used in the structure determination utilizes space group symmetry, which is deduced from the crystal-zone axis and reduces the number of free parameters.
Kilaas
R
R
National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, University of California, Berkeley 94270 USA. roar_kilaas@lbl.gov
Radmilovic
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V