The C-Cr-Fe-Ni-O system has recently been studied with the intention to thermodynamically describe the influence of oxygen on high alloyed steels. In this study the ternary Fe-Mn-O system is assessed and part of the binary Mn-O system is reassessed. a-and b-hausmannite (Mn 3 O 4 ) were earlier described as stoichiometric phases, but are here described using the compound energy formalism with a four sublattice model to be consistent with the preceding study of the Cr-Fe-Ni-O spinel. The liquid phase is assessed using the ionic two-sublattice model. Good agreement between calculated and experimental values is achieved.
In this study, a thermodynamic description of the Mg-Mn-O system is presented.Phase diagram data, structural information, and thermochemical data are used in the assessment. All solution phases are modeled using the compound energy formalism. In addition, heat capacity measurement of the MgMn 2 O 4 and Mg 6 MnO 8 phases are reported. The thermodynamic description reproduces thermochemical, structural, and phase diagram data.
K E Y W O R D SCalphad, heat capacity, metal-matrix composite, Mg
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