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Phase equilibria in the Fe-Mn-Zr system have been studied experimentally using SEM/EDX methods, EBSD and powder x-ray diffraction. Quasi binary section of ZrFe2-ZrMn2 has been constructed. Invariant reactions were studied using differential thermal analysis followed by SEM/EDX. Using obtained experimental results at 1073 K, ternary isothermal section has been constructed. A self-consistent thermodynamic description of the Fe-Mn-Zr system has been developed using the CALPHAD method based on the new experimental information.