A third generation CalPhaD assessment of the Fe-Mn-Ti system part I: The binary subsystems Fe-Mn, Fe-Ti and Mn-Ti

The binary systems Fe-Mn, Fe-Ti and Mn-Ti play remarkable roles in the development of numerous structural and functional materials. As their properties are closely related to the thermodynamic behavior of the phases in the corresponding alloys, the calculation of phase equilibria is crucial for a sustainable and straightforward alloy development. In that course, thermodynamic descriptions within the framework of 3rd generation CalPhaD databases of the binary systems Fe-Mn, Fe-Ti and Mn-Ti were developed. To ensure physically meaningful estimations of the individual thermodynamic properties, advanced sublattice models for several phases, such as A12 (alpha-Mn), A13 (beta-Mn) and C14 (hexagonal Laves phase) were applied. The modelling was supported by heat-capacity measurements for the C14-Mn2Ti phase, to provide a thermodynamically profound basis for a subse-quent description of the phase relations. Through the combination of the advanced models and reliable ther-modynamic data for each system, thermodynamic descriptions could be derived, which facilitate reliable calculations from 0 K to far beyond the melting point of the individual alloys.

Automated summary

Binary systems Fe-Mn, Fe-Ti and Mn-Ti are important in the development of structural and functional materials. Phase equilibria calculations are crucial for reliable alloy development. Advanced sublattice models were applied to derive thermodynamic descriptions and heat-capacity measurements were conducted to support the modeling. Reliable thermodynamic data and advanced models enable calculations from 0 K to melting point of the alloys.