New phase in the high-Al region of Al-Cr

An investigation of the Al–Cu–Cr phase diagram: Phase equilibria at 800–1000°C

“…The diagrams in Refs. [14][15][16] were consistent with the binary boundary constitutional diagrams just accepted from the literature, but meanwhile the Al-Cr and Al-Cu phase diagrams have been modified and new structures associated with several of their phases (see [17][18][19][20][21][22][23][24][25][26][27] and references therein).…”

“…At about 75 at.% Al an additional Al-Cr phase similar to lowtemperature Al 11 Mn 4 and forming in the solid-state was revealed [27]. Its formation was observed after a prolonged annealing at 650 • C and it was not destroyed by a short additional heating to 850 • C. According to our DTA the phase could transform slightly below 900 • C. On the other hand, the same as-cast samples annealed at 800 • C for 100 h contained only ␥ 2 and .…”

On the constitution of the high-Al region of the Al–Cr alloy system

“…Hexagonal Al 4 Cr isostructural to -Al 4 Mn has also been revealed in [7], confirmed in [5] and then in the more recent [8]. Also a base-centered orthorhombic structure with the lattice parameters essentially the same as -Al 4 Cr of [1] was revealed in [5], but associated in the latter with the higher-Al Al 5 Cr phase (also known in the literature as Al 11 Cr 2 or -phase).…”

Complex intermetallics in Al–Cu–Cr system

“…The -phase revealed in Ref. [4] is formed by solid-state reaction ↔ + ␥ 2 . The temperature of the latter reaction has not yet been specified.…”

“…The Al-Cr binary phase diagram is accepted according to the recent updates included in Refs. [3][4][5]. For the convenience of the reader the relevant part of the updated Al-Cr phase diagram is reproduced in Fig.…”