Open AccessCalculation of Phase Trajectories for Microstructural Analysis in Liquidus Fields of Cristobalite and Tridymite for System FeO-SiO2-Fe2O3
Author(s) -
В. И. Луцык,
А. E. Zelenaya,
M. V. Lamueva
Publication year - 2020
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/1441/1/012011
Subject(s) - liquidus , tridymite , cristobalite , phase diagram , wüstite , fayalite , solidus , mineralogy , solvus , phase (matter) , thermodynamics , pigeonite , materials science , geology , chemistry , metallurgy , hematite , quartz , microstructure , augite , olivine , plagioclase , physics , organic chemistry , alloy , superalloy
Two spatial models of the phase diagram (PD) of system FeO-SiO 2 -Fe 2 O 3 have been developed based on the method of computer assembly from phase regions. The first variant presents the simplified phase diagram for system FeO-SiO 2 -Fe 2 O 3 without taking into account the immiscibility surface and without separation of tridymite field on the liquidus of silicon dioxide. Such model includes five liquidus surfaces corresponding to the initial components and two binary compounds fayalite and magnetite. The second model is more accurate and takes into account the presence of a two-phase region of liquid immiscibility, which divides the cristobalite field into two parts. It includes eight liquidus surfaces: two parts of cristobalite, iron, hematite, tridymite, fayalite, wustite, magnetite. The liquidus field of Fe is hypothetical. The surfaces of solidus, solvus, ruled surfaces are constructed and the phase regions are formed. Based on the complete computer model, the possibility of microstructural composition analyzes for system FeO-SiO 2 -Fe 2 O 3 in the crystallization fields of cristobalite and tridimite is demonstrated using the diagrams of vertical mass balance, calculated for a given mass center in all temperature range of crystallization. Two-, one-, and zero-dimensional concentration fields with coincided and individual sets of micro-constituents are shown.