Investigation of Thermodynamic Functions for Iron Boride \[\textrm{Fe}_{2}\textrm{B}\]
DOI:
https://doi.org/10.20535/1810-0546.2015.4.50440Keywords:
Fe-В alloys, Iron boride \[\textrm{Fe}_{2}\textrm{B}\], Entropy, Enthalpy, Heat capacityAbstract
Background. The alloys of Fe-B system find wide application because of a complex of unique physical properties, but in the literature there is no information about thermodynamic functions of phases for these alloys with accounting for the contributions, which are responsible for fluctuation processes description.
Objective. Objective of the paper is to study the physical properties and thermodynamic functions of boride Fe2В, and their temperature dependence with accounting for the zeroth-order approximation for high-temperature expansion of thermodynamic potential for Fe-В system binary alloys.
Methods. Investigation was performed for Fe-В system alloys with boron content of 9,3–15,0 % (wt.),the rest is iron. We use the microstructure, X-ray structural and calorimetric analysis to ascertain the physical properties of alloys.
Results. The phase composition of Fe-В alloys and physical properties of Fe2В boride is determined and temperature dependence of heat capacity for Fe-В alloys is obtained. The thermodynamic functions for Fe2В boride and their temperature dependence are calculated by means of Hillert and Staffonsson model with accounting for the zeroth-order approximation for high-temperature expansion of thermodynamic potential for Fe-В system binary alloys.
Conclusions. The temperature dependence of entropy, enthalpy and heat capacity Ср of iron boride Fe2B in binary Fe-B alloy is obtained for the first time on the basis of Hillert and Staffonsson model with accounting for the zeroth-order contribution of high-temperature expansion of thermodynamic potential. The temperature of iron boride formation is calculated and it agrees with Fe-B diagram data.References
A.I. Matveev, “Corrosion steel 304 Boron with boron, intended for manufacturing of containers with dividers for transportation and storage of spent nuclear fuel”, Novosti Chernoi Metalyrgii za Rybegom. Ekspress-informasiya, 63-I, pp. 1–4, 1981 (in Russian).
T.A. Dergach, “Influencing of boron on the microstructure and properties of pipes made of low carbon austenitic chrome nickel steel”, Voprosy Atomnoj Nayki i Tehxniki. Ser. Fizika Radiasionnix Povreghdevii i Radiaghionnoe Materialovedenie, vol. 88, no. 5, pp. 80–85, 2005 (in Russian).
G.V. Samsonov et al., Borides. Moscow, USSR: Atomizdat, 1975, 220 p. (in Russian).
N.P.Lyakishev et al., Boron-Containing Steels and Alloys. Moscow, USSR: Metalurgіja, 1986, 191 (in Russian).
B. Halemans et al., “Thermodynamic reassessment and calculation of the Fe-B phase diagram”, Z Metallkd, vol. 85, no. 10, pp. 676–682, 1994.
H. Mitsuhiro and T. Nishizawa, “Thermodynamic analysis of Ternary Fe-C-B system”, J. Jap. Inst. Metals, vol. 38, no. 1, pp. 46–54, 1974.
H. Ohtani et al., “Calculation of Fe-C-B ternary phase diagram”, Transactions ISIJ, vol. 28, no. 12, pp. 1043–1050, 1988.
M. Hillert and L. Staffаnsson, “The regular solution model for stoichiometric phases and ionic melts”, Acta Chemica Scandinavica, vol. 24, no. 10, pp. 3618–3626, 1970.
S.V. Tverdokhlebova, “Spectrometry of the boron-containing alloys”, Vіsnyk Dnіpropetrovskogo Nacіonalnogo Unіversitetu. Ser. Fіzika. Radіoelektronіka, vol. 14, no. 12/1, pp. 100–104, 2007 (in Russian).
G.M. Kondratev, Thermal Measurements. Moscow, USSR: Mashgiz, 1975, 244 p. (in Russian).
A.A. Grishin and V.Y. Cherepanov, “The development of metrological provision of heat metering system”, Promyshlennaja Teplotekhnika, vol. 25, pp. 461–462, 2003 (in Russian).
M.I. Shakhparonov, Introduction to the Molecular Theory of Solutions,Moscow,USSR: Gosud. Izd-vo Tekhniko-Teorit. Literatury, 1956, 507 p. (in Russian).
L. Ghirifalko, Statistical Physics of a Solid Body. Moscow, USSR: Mir, 1975, 386 p. (in Russian).
Ya.B. Kyzma, Borides Crystal Chemistry. Lviv,USSR: Vishcha Shkola, 1983, 159 p. (in Russian).
I.M. Spiridonova et al., “Structure and peculiarities of Fe(B,C) crystals”, Metallurgia, vol. 35, no. 2, pp. 65–68, 1996.
E.V. Shyxovaya, “Regularities of the structure and properties of solid solutions based on borides of iron”, Vіsnik Dnіpropetrovskogo Nacіonalnogo Unіversitetu. Ser. Fіzika. Radіoelektronіka, vol. 15-16, no. 2, pp.106–110, 2008 (in Russian).
I.P. Bazarov, Thermodynamics.Moscow,Russia: Vysshaja Shkola, 1991, 376 p. (in Russian).
O.S. Gorelkin et al., “Measurement of heat of formation of intermetallic compounds by sintering method in an isothermal calorimeter”, Rus. J. Phys. Chem., vol. 46, no. 3, pp. 431–437, 1972.
S. Sato and O. J. Kleppa, “Enthalpies of formation of borides of iron, cobalt, and nickel by solution calorimetry in liquid copper”, Metallurgical Transactions B-Process Metallurgy, vol. 13, no. 2, pp. 251–255, 1982.
M. Mihalkovic and M. Widom, “Ab Initio calculations of cohesive energies of fe-based glass-forming alloys”, Phys, Rev. B., vol. 70, no. 14, pp. 144107–144112, 2004.
M.T. Clavageramor et al., “Driving force solid state amorphisation in the Fe-B system”, Collogue de Physique Colloque, vol. C4, no. 51 (15), pp. 49–54, 1990.
S. Raju et al., “Characterisation of high temperature phase stability and evaluation of metallurgical compatibility with SS 304L, of indigenously developed alternate shielding material ferro-boron for fast reactor applications”, Asian Nuclear Prospects, pp. 1–9, 2012.
T. van Rompaey et al., “Thermodynamic Optimization of the B–Fe System”, J. Alloys Compounds, no. 334, pp. 173–181, 2002.
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