Thermodynamic calculation of the Al-B system at pressures to 8 GPa

Abstract

Using models of phenomenological thermodynamics with interaction parameters derived from experimental data on phase equilibria at high pressures and high temperatures, the evolution of topology of the aluminum-boron phase diagram has been studied at pressures up to 8 GPa.

Thermodynamic calculation of the phase diagram for the Al–B–C system at pressure 7.7 GPa

“…The results of the investigations into the phase formation in the Al-B-C system at pressures to 6 GPa are described in [3,4]. The phase diagrams of the Al-B, Al-C, and B-C binary systems at 8 GPa were calculated in [5][6][7]. The phase diagram of the Al-B-C ternary system at high pressures has not been constructed.…”

“…The models of phases and the parameters of stability and interaction between the system phases at the ambient pressure were taken from [2]. For the calculations of the phase equilibria in Al-B, Al-C, and B-C binary systems at high pressure the results reported in [5][6][7] are used. The liquid phase is described in the approximation of subregular solutions, the mixing volume of the ternary system is taken equal to zero.…”

“…The molar volumes of ternary phases under standard conditions = 240.7 × 10 -6 m 3 /mole, = 277 × 10 -6 m 3 /mole, = 201.2 × 10 -6 m 3 /mole, = 145 × 10 -6 m 3 /mole are taken from the PDF 2 base [11]. Because of the absence of the data on the compression moduli, their derivatives, and coefficients of thermal expansion for the ternary phases in the literature, the values for AlB 12 are used [5].…”