Phase equilibria investigations on the aluminum-rich part of the binary system Ti-Al

The binary system Ti-Al has been reinvestigated in the composition range of 50 to 76 at. pct Al by X-ray diffraction, metallography, electron probe microanalysis (EPMA), and differential thermal analysis (DTA). Heat-treated alloys (600°C to 1300°C) as well as the as-cast alloys were investigated. Se...

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Bibliographic Details
Published in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2001-05, Vol.32 (5), p.1037-1047
Main Authors: BRAUN, J, ELLNER, M
Format: Article
Language:English
Subjects:
Aluminum
Applied sciences
Binary system
Binary systems
Casting alloys
Chemical reactions
Cross-disciplinary physics: materials science
rheology
Differential thermal analysis
Electron probe microanalysis
Exact sciences and technology
Heat treatment
Homogeneity
Intermetallic compounds
Intermetallic phases
Materials science
Metallography
Metals. Metallurgy
Metastable phases
Phase diagrams
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Phase equilibria
Physics
Titanium aluminides
Titanium base alloys
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Summary:The binary system Ti-Al has been reinvestigated in the composition range of 50 to 76 at. pct Al by X-ray diffraction, metallography, electron probe microanalysis (EPMA), and differential thermal analysis (DTA). Heat-treated alloys (600°C to 1300°C) as well as the as-cast alloys were investigated. Seven stable intermetallic phases were observed: TiAl, Ti1−xAl1+x, Ti3Al5, TiAl2, Ti5Al11, TiAl3 (h), and TiAl3 (1); two metastable phases, TiAl2 (m) and TiAl3 (m), were also found. For each of these phases, the homogeneity range and the crystal chemical parameters were determined. The temperatures of the solid-state phase reactions were re-established. On the basis of the experimental results, an improved version of the equilibrium phase diagram has been drawn and critically compared with earlier versions presented in the literature.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-001-0114-x