Stable icosahedral phases of Al-Fe-Cu and Al-Li-Cu, which are recognized as icosahedral quasicrystals corresponding to face-centered and simple 6D-hypercubic lattices, respectively, were examined by high-resolution electron microscopy with the incident beam parallel to the two-fold symmetry axis. Images observed were analyzed in detail with the aid of computerized image processing. In the image of Al-Li-Cu, a contrast modulation of about τ3 times distance of lattice spacing was observed on lattice fringes perpendicular to the 5-fold symmetry axes, whereas in Al-Fe-Cu, complex contrast modulations with various distances of 2, 3, and 5 lattice spacings were observed on the lattice fringes perpendicular to the same axes.
- High-resolution electron microscopy
- Icosahedral quasicrystal
ASJC Scopus subject areas
- Physics and Astronomy(all)