Complex orthorhombic phase in the Al-Cr-Fe system

The paper examines alloys in the ternary Al-Cr-Fe system in the region of compositions associated earlier with the extensive region of terminal Fe solid solutions in the hexagonal Al4Cr (mu) binary phase in which iron reaches almost 12 at.%. Scanning electron microscopy, x-ray powder diffraction, and electron diffraction show that the solubility of Fe in the mu-phase is substantially lower. Alloys Al76Cr19Fe5, Al76Cr16Fe8, and Al75Cr16Fe9 annealed at 1000 A degrees C have a complex basecentered orthorhombic structure with a a parts per thousand aEuro parts per thousand 3.27 nm, b a parts per thousand aEuro parts per thousand 1.24 nm, and c a parts per thousand aEuro parts per thousand 2.34 nm.