Accession Number:

AD0719233

Title:

Equation of State of the Alpha and Epsilon Phases of Iron.

Descriptive Note:

Contract rept.,

Corporate Author:

WASHINGTON STATE UNIV PULLMAN DEPT OF PHYSICS

Personal Author(s):

Report Date:

1971-01-01

Pagination or Media Count:

143.0

Abstract:

An empirical equation of state that is thermodynamically consistent is found for the alpha body-centered-cubic and epsilon hexagonal-close-packed phases of iron. A FUNCTIONAL FORM OF THE Helmholtz potential is formulated from general considerations of lattice vibrations, conduction electrons, and ferromagnetic exchange interaction. The Helmholtz potential is adjusted to get a fit to calorimetric, thermal expansion, acoustic, static compression, and shock data. The Gibbs potential corresponding to this fit is used to describe the alpha- epsilon phase transition. Numerical calculational procedures are developed for mixed phases in equilibrium and for time- dependent transformation. Author-PL

Subject Categories:

  • Properties of Metals and Alloys
  • Thermodynamics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE