Electron microscopy study of approximant phases in the Al–Cr–Fe system

Stable decagonal quasicrystals in the Al-Fe-Cr and Al-Fe-Mn alloy systems

“…Concerning Al-Fe-Cr, the previous publications were mainly devoted to individual phases and alloys (see ref. [7] and references therein), while the only published relevant 1000 • C isothermal section [8] was found in our experiments to be erroneous. Our more detailed * Corresponding author at: I.…”

“…At slightly lower temperatures it is also in equilibrium with the so-called O 1 -phase reported earlier (see ref. [7] and references therein). The latter is a stable orthorhombic phase with the lattice parameters of a = 3.27 nm, b = 1.24 nm and c = 2.34 nm.…”

Multiple quasicrystal approximants with the same lattice parameters in Al-Cr-Fe-Si alloys

“…For example, the structural models of some approximants were proposed by electron crystallography1213141516, based on the structural relationships of the known and unknown approximants determined from the high resolution transmission electron microscopy (HRTEM) images. Some typical structural blocks, such as hexagon (H), boat (B), star (S), and decagon (D)17181920, are often found in Al-based decagonal quasicrystals (DQCs) and their approximants; and the rich combinations of these substructures lead to an abundance of approximants212223242526. Among them, the approximants with different lattice parameters may consist of the same structural blocks, for example, the H tile for (1/0, 2/1) and (1/1, 1/1) approximants2728.…”