Crystallographic relationships of the Al4Cr Crystalline and Quasicrystalline Phases

Investigation of the Al–Cr γ-range

“…While the structures of the , and phases are still under discussion (see controversies in [7,[9][10][11]), this did not influence the shape of the high-Al part of the Al-Cr phase diagram. In contrast, the new results presented in [6] and [12] are inconsistent with the accepted shape of the phase diagram between 30-42 at.% Cr (so-called ␥-range reproduced in Fig.…”

“…More recently, the Al-Cr alloy system and its individual phases were studied again in [5][6][7][8][9][10][11][12]. While the structures of the , and phases are still under discussion (see controversies in [7,[9][10][11]), this did not influence the shape of the high-Al part of the Al-Cr phase diagram.…”

Hexagonal phases consisting of icosahedral chains/networks in (0 0 1) layers in Al–Cr–Si alloys

“…In a PFP layer block, two icosahedra are mutually interpenetrated in 1 0 0 directions (see Fig. 2 in [18] and Fig. 8(b) in [20]).…”

“…In a c period, there are 12 layers of flat (also almost flat) and puckered layers in the [0 0 1] direction. Subsequently, the hexagonal Al 4 Cr was found to be isostructural with -Al 4 Mn [15][16][17][18] and was therefore called -Al 4 Cr [15,16,18]. Recently, the isomorphic Mn/Cr substitution in this hexagonal Al 4 Mn x Cr 1−x phase has also been confirmed by neutron powder diffraction and magnetization measurements [23,24].…”

Reaction Scheme and Liquidus Surface in the Al-Rich Section of the Al-Cr-Ni System

“…This phase was labeled e, because it was found to have lattice parameters virtually identical to the reportedly binary phase e-CrAl 4. [13][14][15] This phase did not occur at 900°C, but Grushko et al [12] mentioned the existence of two more ternary phases at lower temperatures without giving further details.…”