Thermodynamic optimization of the boron–cobalt–iron system

• Published in: Journal of alloys and compounds 2011-04, Vol.509 (14), p.4805-4810
• Main Authors: Liu, Y.Q., Zhao, X.S., Yang, J., Shen, J.Y.
• Format: Article
• Language: English
• Subjects: Alloys; B–Co–Fe system; CALPHAD; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Liquids; Materials science; Mathematical models; Optimization; Phase diagrams; Phase diagrams and microstructures developed by solidification and solid-solid phase transformations; Phase diagrams of metals and alloys; Physics; Ternary systems; Thermodynamic modeling; Thermodynamic properties; Thermodynamics
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2011.01.170

► The B–Co–Fe system was thermodynamically modeled using the CALPHAD method. ► The three ternary line compounds were modeled using the two sublattice model, and the liquid, fcc_A1, bcc_A2 and hcp_A3 phases were modeled using the substitutional solution model. ► The calculated phase diagram and thermodynamic properties agree reasonably with most of the experimental data. A thermodynamic optimization of the boron–cobalt–iron ternary system is performed based on thermodynamic models of the three constitutional binary systems and the experimental data on phase diagrams and thermodynamic properties of the ternary system. The liquid, fcc_A1, bcc_A2 and hcp_A3 solution phases are described by the substitutional solution model. The three intermediate line compounds, (Co,Fe)B, (Co,Fe) 2B and (Co,Fe) 3B, are described by the two sublattice model. A set of thermodynamic parameters are obtained. The calculated phase diagram and thermodynamic properties are in reasonable agreement with most of the experimental data.