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
收藏
页码：218 / 233
页数：16
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