Thermodynamic re-assessment of the Ti-Al-Nb system

被引：35

作者：

Cupid, Damian M. ^{[1
,2
]}

Fabrichnaya, Olga ^{[1
]}

Rios, Orlando ^{[2
]}

Ebrahimi, Fereshteh ^{[2
]}

Seifert, Hans J. ^{[2
]}

机构：

[1] Freiberg Univ Min & Technol, Inst Mat Sci, D-09599 Freiberg, Germany

[2] Univ Florida, Dept Mat Sci & Engn, Gainesville, FL 32611 USA

来源：

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH | 2009年 / 100卷 / 02期

关键词：

CALPHAD; Ti-Al-Nb; Phase equilibria; Modeling; Thermodynamics; 1400-DEGREES-C ISOTHERMAL SECTION; PHASE-EQUILIBRIA; ORTHORHOMBIC PHASE; ORDERING BEHAVIOR; SITE OCCUPANCY; O-PHASE; ALLOYS; TRANSFORMATIONS; MICROSTRUCTURES; STABILITY;

D O I：

10.3139/146.110015

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

A CALPHAD based re-assessment of the thermodynamic description of the Ti-Al-Nb system was performed to take into account experimental evidence of the extension of the primary crystallization of the beta-phase to higher Al contents. The adjustable parameters of the analytic expressions of the Gibbs free energy for the Liquid, beta-, beta(0)-, delta-, sigma-, gamma-, alpha-, and alpha(2)-phases were re-optimized using available experimental data from a critical assessment of the literature. The calculated primary crystallization of P-phase is in better agreement with experiment although the extension of the single phase P-field to higher Al compositions could not be calculated. Calculated isothermal sections are in good agreement with experiment in the temperature range 1923 K to 1273 K.

引用

页码：218 / 233

页数：16

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