Effect of coherency stresses on [alpha] + [alpha][sub 2] phase equilibria in Ti-Al alloys

Journal Article · Wed Sep 01 00:00:00 EDT 1993 · Acta Metallurgica et Materialia; (United States)

DOI:https://doi.org/10.1016/0956-7151(93)90127-E· OSTI ID:6052726

Huh, J Y; Johnson, W C ^[1]; Howe, J M ^[2]

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1. Carnegie Mellon Univ., Pittsburgh, PA (United States). Dept. of Materials Science and Engineering
2. Univ. of Virginia, Charlottesville, VA (United States). Dept. of Materials Science and Engineering

Experiments were performed on two Ti-Al alloys to examine recent theoretical predictions concerning the characteristic of coherent two-phase equilibria in binary alloys. Equilibrium phase compositions in both the coherent and incoherent [alpha] + [alpha][sub 2] states at 725 and 800C were determined by analytical electron microscopy. The results provide experimental evidence for the following predictions: (1) tie-line ends (equilibrium phase compositions) need not coincide with phase boundaries in the temperature-composition phase diagram, and (2) the tie-line ends change with alloy composition at constant temperature. The experimental results have been compared with theoretical calculations of [alpha] + [alpha][sub 2] phase equilibria incorporating both elastic and ordering effects.

• OSTI ID: 6052726
• Journal Information: Acta Metallurgica et Materialia; (United States), Vol. 41:9; ISSN 0956-7151
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM ALLOYS
PHASE STUDIES
TITANIUM BASE ALLOYS
BINARY ALLOY SYSTEMS
CHEMICAL COMPOSITION
COMPARATIVE EVALUATIONS
ELECTRON MICROSCOPY
EXPERIMENTAL DATA
PRECIPITATION
TEMPERATURE RANGE 1000-4000 K
X-RAY SPECTRA
ALLOY SYSTEMS
ALLOYS
DATA
EVALUATION
INFORMATION
MICROSCOPY
NUMERICAL DATA
SEPARATION PROCESSES
SPECTRA
TEMPERATURE RANGE
TITANIUM ALLOYS
360102* - Metals & Alloys- Structure & Phase Studies