Thermodynamic activities in the alloys of the Ti-Al-Nb system

Journal Article · Sat May 01 04:00:00 EDT 1999 · Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science

DOI:https://doi.org/10.1007/s11661-999-0280-9· OSTI ID:363990

Eckert, M; Kath, D; Hilpert, K ^[1]

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1. Research Centre Juelich (Germany)

The vaporization of the solid alloys of the Ti-Al-Nb system has been extensively studied, with emphasis on the {alpha}{sub 2}-Ti{sub 3}Al, ({alpha}{sub 2}-Ti{sub 3}Al + {gamma}-TiAl), and {gamma}-TiAl phase fields, by using Knudsen effusion mass spectrometry at temperatures between 1170 and 1635 K. Twenty-four alloy samples of different compositions, were investigated and their Ti and Al partial pressures were determined. The thermodynamic activities of Ti and Al, as well as partial enthalpies and entropies of mixing, were evaluated for the mean temperature of 1473 K. The data obtained are discussed with respect to their significance for high-temperature corrosion of titanium aluminides and the solubility behavior of Nb in the {gamma}-TiAl phase.

• Sponsoring Organization: USDOE
• OSTI ID: 363990
• Journal Information: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science, Journal Name: Metallurgical and Materials Transactions. A, Physical Metallurgy and Materials Science Journal Issue: 5 Vol. 30; ISSN MMTAEB; ISSN 1073-5623
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
CHEMICAL COMPOSITION
KNUDSEN FLOW
NIOBIUM ALLOYS
TEMPERATURE RANGE 1000-4000 K
THERMODYNAMIC ACTIVITY
THERMODYNAMIC PROPERTIES
TITANIUM ALLOYS