Russian Journal of Applied Chemistry, 2012, Vol. 85, No. 12, pp. 1955−1958.
Pleiades Publishing, Ltd., 2012.
Original Russian Text © A.G. Morachevskii, T.V. Butukhanova, E.N. Val’kovskaya, 2012, published in Zhurnal Prikladnoi Khimii, 2012, Vol. 85, No. 12,
Thermodynamic Analysis of Liquid Alloys
of the System
A. G. Morachevskii, T. V. Butukhanova, and E. N. Val’kovskaya
St. Petersburg State Polytechnic University, St. Petersburg, Russia
Received October 23, 2012
Abstract—Integral thermodynamic characteristics of mixing liquid alloys of the ternary system Al–Li–Zn at
1000 K within the entire range of compositions were calculated on the basis of data on the boundary binary sys-
tems Li–Al, Li–Zn, and Al–Zn.
To date there is a great number of various models al-
lowing thermodynamic properties of liquid ternary metal
systems to be estimatded with sufﬁ cient reliability on the
basis of corresponding data on boundary binary systems
[1–5]. All the models are based on the supposition that
thermodynamic properties of ternary and more compli-
cated systems are crucially affected by pairwise interac-
tions of components. Differences between computational
models consist only in technique of the consideration
of contributions of each boundary binary system to the
total value of an integral thermodynamic function of
a ternary or a more complicated system. Irrespective of
applied model, a preliminary estimation of reliability of
experimental data for boundary binary mixtures is rather
Alloys of the aluminum–lithium system and more
complicated compositions on their basis ﬁ nd wide ap-
plication in various technical ﬁ elds [6–9].
Let us consider thermodynamic properties of boundary
binary systems in a liquid state.
Lithium–aluminum system. The compound LiAl
(mp 970 K) with a rather wide homogeneity ﬁ eld and
the phases Li
melting incongruently are
formed in the system . The reviews [11, 12] contain
information on the study of thermodynamic properties
of liquid alloys of the Al–Li system by various experi-
mental methods. In the calculations we used the data
recommended in the monograph of G. I. Batalin et al.
 converted to 1000 K (Table 1).
Lithium–zinc system. Lithium forms with zinc a se-
ries of intermetallic compounds close to each other in
composition . A very ﬂ at maximum in the liquidus
curve (793 K) corresponds to the compound Li
Researches devoted to thermodynamic properties of
liquid alloys of this system are few [15–17]. Hoshino
et al. have studied only a range of compositions poor in
lithium (0.0074 ≤ x
≤ 0.2963, 773 K)  by the EMF
method. Moser  has fulﬁ lled a calorimetric study
(0.009 ≤ x
≤ 0.628, 816–820 K). Thermodynamic prop-
erties of liquid alloys of the system Li–Zn were studied
by the EMF method within a wide range of compositions
(0.025 ≤ x
≤ 0.880, 773–850 K) in the work . The
results of the determination of the enthalpy of mixing ∆H
in the works [16, 17] agree well with each other. Input
data for our calculations were based on the data of these
works (Table 1).
Aluminum–zinc system. Thermodynamic properties
of liquid alloys of the system Al–Zn were repeatedly
studied by various methods. An examination of early
studies was published in the work . Input data for
the calculation are based on the recommendations given
in the monograph  (Table 1). In the system positive
deviations from ideal behavior are observed.
It has been shown earlier [19, 20] that the concentra-