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 quickl y estimating a possible translation of the origin is outlined. The optimiza tion algorithm used in the structure determination utilizes space group sym metry, which is deduced from the crystal-zone axis and reduces the number o f free parameters. Published by Elsevier Science B.V.