Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K

Woo Yeol Cha; Tetsuya Nagasaka; Takahiro Miki; Yasushi Sasaki; Mitsutaka Hino

doi:10.2355/isijinternational.46.996

Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K

Woo Yeol Cha, Tetsuya Nagasaka, Takahiro Miki, Yasushi Sasaki, Mitsutaka Hino

ENG - Metallurgy

Research output: Contribution to journal › Article › peer-review

65 Citations (Scopus)

Abstract

The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. Ti₂O₃(s)=2Ti+3O (0.5<mass%Ti<6.2) log K=-10.17, e_o^Ti=-0.34 ′Ti₃O₅′(s)=3Ti+5O (0.0004<mass%Ti<0.36) log K=-16.86, e_o^Ti=-0.34 The Henry constant of Ti in liquid Fe-Ti alloy was assessed as follows at 1 873 K. γ _Ti(l)^o=0.0090 The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. ⁰Ω_Fe-Ti=-73360/J ₀Ω_Ti-O=-1035900/J The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.

Original language	English
Pages (from-to)	996-1005
Number of pages	10
Journal	Isij International
Volume	46
Issue number	7
DOIs	https://doi.org/10.2355/isijinternational.46.996
Publication status	Published - 2006

Keywords

Interaction parameter
Phase equilibria
Quadratic formalism
Redlich-Kister polynomial
Thermodynamics
Ti deoxidation equilibrium
Titanium oxides

ASJC Scopus subject areas

Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.2355/isijinternational.46.996

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title = "Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K",

abstract = "The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. Ti2O3(s)=2Ti+3O (0.5oTi=-0.34 ′Ti3O5′(s)=3Ti+5O (0.0004oTi=-0.34 The Henry constant of Ti in liquid Fe-Ti alloy was assessed as follows at 1 873 K. γ Ti(l)o=0.0090 The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. 0ΩFe-Ti=-73360/J 0ΩTi-O=-1035900/J The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.",

keywords = "Interaction parameter, Phase equilibria, Quadratic formalism, Redlich-Kister polynomial, Thermodynamics, Ti deoxidation equilibrium, Titanium oxides",

author = "Cha, {Woo Yeol} and Tetsuya Nagasaka and Takahiro Miki and Yasushi Sasaki and Mitsutaka Hino",

year = "2006",

doi = "10.2355/isijinternational.46.996",

language = "English",

volume = "46",

pages = "996--1005",

journal = "Transactions of the Iron and Steel Institute of Japan",

issn = "0915-1559",

publisher = "Iron and Steel Institute of Japan",

number = "7",

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TY - JOUR

T1 - Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K

AU - Cha, Woo Yeol

AU - Nagasaka, Tetsuya

AU - Miki, Takahiro

AU - Sasaki, Yasushi

AU - Hino, Mitsutaka

PY - 2006

Y1 - 2006

N2 - The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. Ti2O3(s)=2Ti+3O (0.5oTi=-0.34 ′Ti3O5′(s)=3Ti+5O (0.0004oTi=-0.34 The Henry constant of Ti in liquid Fe-Ti alloy was assessed as follows at 1 873 K. γ Ti(l)o=0.0090 The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. 0ΩFe-Ti=-73360/J 0ΩTi-O=-1035900/J The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.

AB - The equilibrium between Ti and O has been investigated in molten Fe-Ti alloy saturated with various kinds of titanium oxides at 1 873 K. The present results have been thermodynamically analyzed applying Wagner's formalism as well as Darken's quadratic formalism with the excess Gibbs free energy change of mixing described by Redlich-Kister type polynomial. The equilibrium constants and the interaction parameters of Wagner's formalism were given as follows at 1 873 K in the present work. Ti2O3(s)=2Ti+3O (0.5oTi=-0.34 ′Ti3O5′(s)=3Ti+5O (0.0004oTi=-0.34 The Henry constant of Ti in liquid Fe-Ti alloy was assessed as follows at 1 873 K. γ Ti(l)o=0.0090 The interaction parameters of Redlich-Kister type polynomial for molten Fe-Ti-O alloy were given by the following values at 1 873 K in the present work. 0ΩFe-Ti=-73360/J 0ΩTi-O=-1035900/J The estimated results based on Wagner's formalism as well as Darken's quadratic formalism polynomials were well agreed with the experimental results which were observed between Ti and O equilibrium contents in molten Fe-Ti alloy.

KW - Interaction parameter

KW - Phase equilibria

KW - Quadratic formalism

KW - Redlich-Kister polynomial

KW - Thermodynamics

KW - Ti deoxidation equilibrium

KW - Titanium oxides

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Equilibrium between titanium and oxygen in liquid Fe-Ti alloy coexisted with titanium oxides at 1873K

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