Thermodynamic description of the Mn-Si system: An experimental and theoretical work

Differential thermal analyses are performed on Mn-Si alloys with x(Si) = 0.6206-0.6364. Existence of a solid solution at the MnSix (with x around 0.63) phase is evidenced. Based on a careful review of the literature, the Mn-Si system is modeled using the Calphad method. The liquid, cbcc_a12, cub_a13, fcc_a1 and bcc_a2 phases are modeled as substitution solutions using the Redlich-Kister formalism. Mn3Si, Mn5Si3 and MnSi are treated as stoichiometric compounds and the stoichiometric variations of R-Mn6Si v-Mn9Si2 and MnSix are respectively described as (Mn)(0.49) (Mn,Si)(0.36) (Mn,Si,VA)(0.15), (Mn)(0.613) (Mh,Si)(0.215) (Mn,Si)(0.108) (Si)(0.064) and (Mn)(0.146) (Mn,VA)(0.220) (Mn,Si)(0.244) (Si)(0.390). The results are in good agreement with the set of experimental data which is carefully selected. Finally, a few experimental data which could be checked are suggested. (C) 2014 Elsevier B.V. All rights reserved.