Cu-Fe-Mn (Copper-Iron-Manganese)

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Section II: Phase Diagram Evaluations

Cu-Fe-Mn (Copper-Iron-Manganese) V. Raghavan

The review of this ternary system by [1988Ray] presented a liquidus surface and four isothermal sections at 1050, 950, 900, and 850 C. The later updates by [1994Rag] and [2002Rag] added two computed isothermal sections at 1300 and 1150 C from the work of [1981Nis] and an experimental section at 1200 C based on the studies of [1997Oht]. The compilation of [1995Vil] included a liquidus projection and four isothermal sections assessed by [1988Ray], eight computed isothermal sections between 1300 and 600 C from [1978Has], four vertical sections from [1913Par], and computed isothermal sections near the Fe corner by [1989Har] showing the face-centered cubic (fcc) – bodycentered cubic (bcc) equilibrium between 850 and 550 C. Miscibility gaps in the liquid and solid states were calculated by [2004Wan], who constructed a thermodynamic data base for Cu-Fe-X (X: Al, Co, Cr, Mn, Mo, Nb, Ni, V) ternary systems. [2003Mie] gave a thermodynamic description of the system near the Fe-Cu side. Recently, [2007Wan] carried out a thermodynamic assessment of this ternary system and computed nine isothermal sections, six vertical sections, and a liquidus projection. The computed diagrams were compared with the available experimental data.

known in the Cu-Fe and Cu-Mn systems. Computed phase diagrams of Cu-Fe, Cu-Mn, and Fe-Mn were given by [2007Wan]. Continuous face-centered cubic (fcc) solid solutions form between fcc Fe and cMn (denoted fcc1) and between Cu and cMn (denoted fcc2).

Ternary Thermodynamic Assessment

There are no intermediate phases in any of the three binary subsystems. A metastable liquid miscibility gap is

In their thermodynamic optimization of this ternary system, [2007Wan] used the available experimental results from the literature, including the reviewed data of [1988Ray] and [1995Vil]. No experimental measurements on the thermodynamic properties are known. The liquid, face-centered cubic (fcc), body-centered cubic (bcc), (aMn), and (bMn) phases were described by a subregular solution model. The magnetic contribution to the Gibbs energy was taken into account. The ternary interaction parameters derived by [2007Wan], along with the applicable binary parameters, were listed. Nine isothermal sections between 1300 and 800 C were computed by [2007Wan], these depicting the equilibrium between fcc1 and fcc2 or between fcc1 and liquid. The sections at 1300, 1050, 950, and 850 C are shown in Fig. 1-4. These are compared with experimental data from various sources, showing good agreement. Six vertical sections were computed by [2007Wan] at 10 or 20 mass % of Cu, Fe and Mn respectively. The computed

Fig. 1 Cu-Fe-Mn computed isothermal section at 1300 C [2007Wan]

Fig. 2 Cu-Fe-Mn computed isothermal section at 1050 C [2007Wan]

Binary Systems

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Journal of Phase Equilibria and Diffusion Vol. 29 No. 6 2008

Phase Diagram Evaluations: Section II

Fig. 3 Cu-Fe-Mn computed isothermal section at 950 C [2007Wan]

Fig. 4 Cu-Fe-Mn comput

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