Al-Fe-Mn-Si (Aluminum-Iron-Manganese-Silicon)
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Phase Diagram Evaluations: Section II
Al-Fe-Mn-Si (Aluminum-Iron-Manganese-Silicon) V. Raghavan
Early literature on this quaternary system includes the results of [1943Phi] and [1950Phr]. More recently, [1975Bar] reviewed the experimental data on the liquidus projection and the phase distribution in the solid state. In a series of papers, Zakharov et al. [1988Zak, 1989Zak1, 1989Zak2] prepared two series of alloys with a constant Si content of either 10 or 14 mass% and reported several isothermal and polythermal sections. [1996Dav] investigated Al-rich alloys at 550 C. [2003Bal] presented a thermodynamic assessment of the system and compared computed vertical sections and isothermal sections with the results of [1943Phi], [1988Zak] and [1989Zak1]. The most recent thermodynamic description of the system is by [2005Du]. They listed the optimized interaction parameters for the ternary phases aAlMnSi and b AlFeSi, and the quaternary phase FeMnSi2Al8. The computed temperatures and compositions of the invariant reactions in Al-rich alloys were listed and a typical computed isopleth was given.
Ternary Systems Recent studies/reviews of the four ternaries are: [2006Umi] (Al-Fe-Mn), [2004Du] (Al-Mn-Si), [2002Rag] (Al-Fe-Si) and [1988Ray] (Fe-Mn-Si).
Fig. 1 Al-Fe-Mn-Si liquidus projection from the Al apex on to the basal plane showing the phases nearest to the apex. All fields have (Al) additionally [1975Bar]
Quaternary Phase Equilibria One quaternary phase is stable in this system. Occurring at the nominal composition FeMnSi2Al8 (or Fe2MnSi2Al15 or (Fe,Mn)4Si3Al16), it is cubic (space group Im 3) with a = 1.252 nm. During the course of their investigation of the Al-Fe-MgMn-Si quinary system, [1975Bar] reviewed the experimental data on the liquidus projection for this quaternary system, in which the Al apex of the tetrahedron was used to project on the basal plane the features nearest to the apex. The fields marked in Fig. 1 from [1975Bar] have additionally (Al) in equilibrium with the liquid. Figure 2 shows the phase distribution in the solid state. The fields contain (Al) as an additional phase [1975Bar]. In a series of investigations, [1988Zak], [1989Zak1] and [1989Zak2] examined quaternary alloys in the composition range of 10-14 mass% Si, 0-3 mass% Fe and 0-4 mass% Mn. They prepared the alloys with the starting metals of minimum purity of 99.995% Al, 99.98% Fe, 99.85% Mn and 99.9999% Si. The phase equilibria were studied with differential thermal analysis (DTA), metallography and x-ray diffraction. The results were presented as six polythermal sections at 10Si-1Fe and 14Si-1Fe (in mass%) [1988Zak], at 10Si-2Fe and 14Si-2Fe (in mass%) [1989Zak1] and at 10Si-3Fe and 14Si-3Fe (in mass%) [1988Zak]. [1989Zak2] presented four isothermal sections at constant 10Si and 14Si (in mass%) and at 660 and
Fig. 2 Al-Fe-Mn-Si phase distribution in the solid state with (Al) as an additional phase [1975Bar]
Journal of Phase Equilibria and Diffusion Vol. 28 No. 2 2007
215
Section II: Phase Diagram Evaluations 580 C. [2003Bal] accepte
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