Ternary phases forming adjacent to Al3MnAl4Mn in AlMnTM (TM = Fe, Co, Ni, Cu, Zn, Pd)

Publication date: 25 August 2016
Source:Journal of Alloys and Compounds, Volume 677
Author(s): B. Grushko, D. Pavlyuchkov, S.B. Mi, S. Balanetskyy
The AlMn alloy system contains complex intermetallics in its Al-rich part, and this was the first system where quasiperiodic structures were recognized. In the present work, the solubility of TMs (TM = Fe, Co, Ni, Cu, Zn and Pd) in the stable binaries, the stabilization effect of these elements on the metastable binaries and the formation of ternary compounds are specified and compared. While the solubility of all these TMs in hexagonal μ-Al4Mn and λ-Al4Mn is low, the high-temperature orthorhombic T-Al3Mn dissolves up to at least 14.5, 12, 16 and 7.5 at.% Fe, Cu, Zn and Pd, respectively. The metastable hexagonal φ-Al10Mn3 is stabilized by Fe, Co and Ni in wide ternary compositional regions, and in AlCoMn such a region propagates up to Al5Co2. In alloys with Fe, Co and Ni, a ternary hexagonal phase isostructural to the AlCrNi ζ-phase (P63/m, a ≈ 1.76, c ≈ 1.25 nm) is formed along ∼80 at.% Al, while in alloys with Cu and Pd the orthorhombic so-called R-phase (Bbmm, a ≈ 2.41, b ≈ 1.25, c ≈ 0.76 nm) was found at similar compositions. This structure is also known in AlZnMn but at much lower-Al Al68Zn14.5Mn17.5, while in the range of 75–80 at.% Al a monoclinic phase isostructural to η-Al11Cr2 (C2/c, a ≈ 1.76, b ≈ 3.04, c ≈ 1.76 nm, β ≈ 90°) is formed. In addition to the stable decagonal D3-phase in AlFeMn and AlPdMn reported earlier, the stabilization of binary AlMn D3-phase was revealed around Al64Cu20Mn16.

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