Abstract
Vapor pressure measurements have been made on twenty two manganese-silicon alloys in the liquid state, at temperatures between 1400 to 1900 K, using a torsion-effusion technique. The thermodynamic properties of the system have been calculated from the observed vapor pressures of manganese over the alloys at 1700 K. The activities of the components show very strong negative deviations from ideality and the heats of forma-tion are markedly exothermic. Excess free energies evaluated from the vapor pres-sures have been combined with the calorimetrically measured heats of formation, avail-able in the literature, to obtain the excess entropies of mixing which are found to be moderately negative. The present results are assessed with respect to the existing phase equilibria and other thermodynamic data for the solid and liquid states. Among the fac-tors influencing the properties of these alloys, a tendency to form covalent linkages in the liquid state appears most significant.
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REFERENCES
J. N. Pratt:Rev. Int. Hautes Temper, et Refract, 1967, vol. 4, p. 97.
P. J. Spencer and J. N. Pratt:Trans. Faraday Soc, 1968, vol. 64, p. 1470.
P. J. Spencer and J. N. Pratt:Rev. Int. Hautes Temper, et Refract., 1968, vol. 5, p. 155.
P. J. Spencer and J. N. Pratt:Trans. TMS-AIME, 1968, vol. 242, p. 1709.
E. D. Carter:Physicochemical Measurements in Metals Research, part 1, R. A. Rapp, ed., pp. 21–94, Wiley-Interscience, New York, 1970.
P. J. Spencer and J. N. Pratt:Brit. J. Appl. Phys., 1967, vol. 18, p. 1473.
R. Hultgren, P. D. Desai, D. T. Hawkins, M. Gleiser, K. K. Kelley, and D. D. Wagman:Selected Values of the Thermodynamic Properties of the Elements, ASM, Metals Park, Ohio, 1973.
O. L. Davies:Statistical Methods in Research and Production, Oliver and Boyd, London, 1967.
G. I. Batalin and V. S. Sudavtsova:Ukrain. Khim. Zhur, 1974, vol. 40, no. 5, p. 542.
M. S. Petrushevskii, P. V. Kocherov, P. V. Geld, V. M. Zamyatin, and S. I. Suchilnikov:Russ. J. Phys. Chen, 1973, vol. 47, p. 158.
J. N. Pratt and N. Ahmad: Final Tech. Report, U.S.D.A. Grant No. DA-ERO-124-74-G0060, June 1975.
R. Gee and T. Rosenqvist:Scand J. Metall., 1976, vol. 5, p. 57.
F. A. Shunk:Constitution of Binary Alloys, 2nd Supplement, McGraw-Hill, New York, 1969.
T. Mager and E. Wachtel:Z. Metalk., 1970, vol. 61, p. 853.
L. Rossemyr and T. Rosenqvist:Trans. TMS-AIME, 1962, vol. 224, p. 140.
V. N. Eremenko, G. M. Lukashenko, and V. P. Sidorko:Sov. Powder Met. Met. Ceram., 1964, vol. 5, p. 393; 1965, vol. 9, p. 765.
Yu. M. Gertman and P. V. Geld:Isv. Vys. Vchebn. Zaved. Chern. Met., 1959, vol. 9, p. 15.
T. G. Chart:A Critical Assessment of Thermochemical Data for Transition Metal-Silicon Systems, N.P.L. Report Chem. 18, National Physical Laboratory, Teddington, England, 1972.
S. M. Letun and P. V. Geld:High Temp., 1965, vol. 3, p. 39.
S. M. Letun, P. V. Geld, and N. N. Serebrennikov:Russ. Metall., 1965, vol. 6, p.97;Izv. Vys. Vchebn. Zaved. Chem. Met., 1965, vol. 4, p. 5; 1966, vol. 12, p. 5.
T. K. Kostina, B. A. Baum, P. V. Geld, and K. T. Kuroschkin:Russ. Metall, 1971, vol. 4, p. 81.
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Nazir Ahmad, formerly Research Student/Research Fellow, Department of Physical Metallurgy and Science and Materials, University of Birmingham
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Ahmad, N., Pratt, J.N. Thermodynamic properties of liquid manganese-silicon alloys. Metall Trans A 9, 1857–1863 (1978). https://doi.org/10.1007/BF02663420
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DOI: https://doi.org/10.1007/BF02663420