Torsion Effusion Measurements on Fe-Mn, Co-Mn and Fe-Co-Mn Alloys

  • F. H. Hayes
  • G. McHugh
Part of the NATO ASI Series book series (ASIC, volume 286)


The aim of this work is to obtain the thermodynamic properties of the solid alloy phases of binary and ternary combinations of iron, cobalt and manganese. This has been achieved by measuring equilibrium manganese vapour pressures using the Torsion Effusion Technique applied to Fe-Mn, Co-Mn and Fe-Co-Mn alloys at temperatures in the range 1250K to 1450K. The design and construction of the torsion effusion equipment, suitable for studies at temperatures up to 2000K, are described. Results obtained for the Fe-Mn and Co-Mn systems are presented and compared in the form of activity-composition diagrams with results of previous workers. Results for Fe-Co-Mn alloys with Fe/Co ratio of 1.05 are given in the form of manganese vapour pressure-temperature plots and as plots of integral Gibbs energies, integral enthalpies and integral entropies of mixing versus manganese content at 1350K. It is found that the Bonnier equation applied in the direction of manganese gives values which agree closely with the present Fe-Co-Mn results.


Suspension System Effusion Cell Vapour Pressure Measurement Integral Enthalpy Solid Solution Range 
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Copyright information

© Kluwer Academic Publishers 1989

Authors and Affiliations

  • F. H. Hayes
    • 1
  • G. McHugh
    • 1
  1. 1.Metallurgy and Materials Science Dept.University of Manchester/UMISTManchesterUK

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