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) : Andrews,Dudley J.

Report Date : JAN 1971

Pagination or Media Count : 143

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)

Descriptors :   (*IRON, EQUATIONS OF STATE), PHASE STUDIES

Subject Categories : Properties of Metals and Alloys
      Thermodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE