Thermodynamic modelling of the Al–Co–Mn system AITranslate

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DOI：https://doi.org/10.1016/j.calphad.2020.101793

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In the present work, the Al–Co–Mn ternary system is thermodynamically modelled using the Calphad approach. In the modelling, experimental data such as liquidus, solidus, tie lines, and phase boundaries are included. An order–disorder model is used to describe the bcc and B2 phases. The bcc/B2 description was modified in the binary Al–Co system to improve the fit of bcc/B2 equilibria in the ternary system. The thermodynamic models of Al5Co2, M-Al13Co4, γ 1 , and γ 2 intermetallic phases were modified to include the third element to reflect the solubility of this element in the ternary system. The ternary phase T-AlCoMn is described as a stoichimetric compound. Ternary interaction parameters for liquid, bcc, β-Mn, and hcp were optimized, using all the relevant experimental data in the literature. Calculated isothermal and isoplethal sections are compared with experimental data. A comparison between modelling and experimental measurements showed a good agreement between the present results and experiments.