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Thermodynamics of Titanium Alloys. II. The Titanium-Aluminum System.
Technical rept. Jul 66-Jun 69,
CINCINNATI UNIV OH DEPT OF MATERIALS SCIENCE AND METALLURGICAL ENGINEERING
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Activities of titanium and aluminum were measured at 1780K in the body-centered cubic beta phase of the titanium-aluminum system, from zero to forty atomic percent aluminum, using three Knudsen effusion-time-of-flight mass spectrometer techniques. In the first technique the alloy of interest is placed in an ordinary Knudsen cell and the Al27 and Ti48 peak intensities are monitored as a function of composition from zero to forty atomic percent aluminum. In the second technique, aluminum weight loss experiments are carried out to determine the activity of aluminum as a function of composition from fifteen to forty atomic percent aluminum. In the third technique, the triple Knudsen cell is used to measure the activity of titanium. Author
APPROVED FOR PUBLIC RELEASE