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The structure of α−AlMnSi is examined by atomic resolutionhigh-resolution transmission electron microscopy (HRTEM) and computer-basedimage matching techniques. Six distinct zone axes are examined; including bothnormal crystallographic and non-crystallographic zone axes of the structuralmotifs, which have m35 icosahedral symmetry. The results provide a sound basisfor understanding HRTEM images of crystalline and quasicrystalline alloys ofAlMnSi; thus we examine to what extent the requirements for obtainingso-called structure images of complex alloy structures may be metexperimentally and define when the images may be reliably interpreted on thebasis of computer simulation and image-matching at about 0·17nmresolution. Most difficulty was experienced in obtaining the experimentalimages, especially for the non-crystallographic zones, which are verysensitive to slight changes in orientation off the desired zone axis orprojection, the rate at which the crystal thickness is increasing(wedge-angle) and the orientation of the surfaces of the specimen. Surfaceamorphous layers due to oxidation and/or electron-induced irradiationdamage also limit the efficiency of the HRTEM analysis.For the thin specimens used for HRTEM, both the electron diffraction patternsand the HRTEM images are characteristic of Im 3 space group symmetry. It issuggested that this Im 3 symmetry may be an example of a statistical symmetry,where the local symmetry is close to Pm 3 but the average symmetry is Im 3.The transition from Pm 3 to Im 3 may be understood in terms of an analysis ofsmall changes in the outer shells of the large icosahedral structural elementswhich are located at the corners and body-centres of the cubic unit cell.

HRTEM Study of α-AlMnSi Crystals including Non-crystallographic Projection Axes