Application of Onsager's reciprocity relations to interface motion during phase transformations

Journal Article · Sun Jan 15 04:00:00 EST 1989 · J. Chem. Phys.; (United States)

DOI:https://doi.org/10.1063/1.456168· OSTI ID:6621186

Kaplan, T; Aziz, M J; Gray, L J

A number of theories have been developed for the kinetics of steady-state interface motion during a phase transformation. One requirement of such theories is that they satisfy Onsager's reciprocity relations for coupled irreversible processes. We show how to apply Onsager's relations to a phase transformation at a moving planar interface in a two-component system. The appropriate pairs of thermodynamic forces and conjugate fluxes are determined and used to test two proposed theories for interface motion during solidification of binary alloys. It is shown that the continuous growth model ''with solute drag'' of Aziz and Kaplan is inconsistent with Onsager's relations, but the continuous growth model ''without solute drag'' is consistent with Onsager's relations.

• Research Organization: Solid State Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6032
• OSTI ID: 6621186
• Journal Information: J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 90:2; ISSN JCPSA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201 -- Chemical & Physicochemical Properties
ALLOY SYSTEMS
BINARY ALLOY SYSTEMS
CRYSTALS
ELEMENTS
FLUIDS
INTERFACES
IRREVERSIBLE PROCESSES
LIQUID METALS
LIQUIDS
METALS
MOTION
ONSAGER RELATIONS
PHASE TRANSFORMATIONS
SOLIDIFICATION