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

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)

Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1971
Accession Number
AD0719233

Entities

People

  • Dudley J. Andrews

Organizations

  • Washington State University

Tags

DTIC Thesaurus Topics

  • Compression
  • Crystal Lattice Vibrations
  • Crystal Lattices
  • Electrons
  • Equations
  • Mathematics
  • Phase Transformations
  • Thermal Expansion
  • Transitions
  • Vibration

Fields of Study

  • Physics

Readers

  • Computational Modeling and Simulation
  • Materials Science and Engineering.

Technology Areas

  • Microelectronics
  • Microelectronics - Graphene