ALPHA-OMEGA TRANSITION IN TITANIUM : EQUATION OF STATE AND KINETICS
- Carl W.
- Dallas R.
We present the construction of free energy functions for the {alpha} and {omega} phases of Ti. These free energies combine information from ambient pressure, static high pressure, and shock wave measurements as well as first principles total energy calculations. The Hugoniot data are analyzed in terms of this equation of state. The Hugoniot consists of three segments: a metastable {alpha}-phase region, a transition region, and an {omega}-phase branch. The extent of the metastability and time resolved wave profiles are discussed in terms of a model in which the transformation rate depends exponentially on the pressure, an assumption which is motivated by static high-pressure data. This picture is consistent with the observed wave shapes and with the observation that the apparent transformation pressure is dependent on the peak shock pressure.
- Research Organization:
- Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 975587
- Report Number(s):
- LA-UR-01-3481; TRN: US201018%%775
- Resource Relation:
- Conference: "Submitted to: APS Conference on Shock Compression of Condensed Matter, Atlanta, Ga, 6/24/01-6/29/01."
- Country of Publication:
- United States
- Language:
- English
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