Gibbs free energy difference between the undercooled liquid and the beta-phase of a Ti-Cr alloy

Creators: Ohsaka, K.; Trinh, E. H.; Holzer, J. C.; Johnson, W. L.

Abstract

The 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.

Additional Information

© 1992 American Institute of Physics. Received 22 July 1991; accepted 11 December 1991. This work represents one phase of research carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration (NASA). Two of the authors (J.C.H. and W.L.J.) acknowledge the support of NASA under Contract No. NAS 496954MG3203550.

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