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Gibbs free energy difference between the undercooled liquid and the beta phase of a Ti-Cr alloyThe heat of fusion and the specific heats of the solid and liquid have been experimentally determined for a Ti60Cr40 alloy. The data are used to evaluate the Gibbs free energy difference, delta-G, between the liquid and the beta phase as a function of temperature to verify a reported spontaneous vitrification (SV) of the beta phase in Ti-Cr alloys. The results show that SV of an undistorted beta phase in the Ti60Cr40 alloy at 873 K is not feasible because delta-G is positive at the temperature. However, delta-G may become negative with additional excess free energy to the beta phase in the form of defects.
Document ID
19920044622
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Ohsaka, K. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Trinh, E. H. (JPL Pasadena, CA, United States)
Holzer, J. C. (Jet Propulsion Lab., California Inst. of Tech. Pasadena, CA, United States)
Johnson, W. L. (California Institute of Technology Pasadena, United States)
Date Acquired
August 15, 2013
Publication Date
March 2, 1992
Publication Information
Publication: Applied Physics Letters
Volume: 60
ISSN: 0003-6951
Subject Category
METALLIC MATERIALS
Funding Number(s)
CONTRACT_GRANT: NAS4-96954
Distribution Limits
Public
Copyright
Other