Interface stability during the oxidation of binary alloys

Technical Report · Thu Apr 01 04:00:00 EST 1976

DOI:https://doi.org/10.2172/7364469· OSTI ID:7364469

Yurek, G J

The stability of a planar alloy/scale interface during the diffusion-controlled oxidation of a homogeneous, single-phase binary alloy depends on both the thermodynamic and transport properties of the system under consideration. A criterion is presented that can be employed to predict the stability of a planar alloy/scale interface for the specified reaction temperature, alloy composition, and chemical potential of the oxidant when only one component of the alloy is oxidized, anion diffusion predominates in the scale, and the solubility of oxygen in the alloy is essentially zero. A planar alloy/scale interface (a single-phase scale) is the preferred growth morphology if diffusion in the oxide phase is the rate-limiting step of the oxidation reaction. An uneven alloy/scale interface (a two-phase scale) is expected if diffusion in the alloy phase is the rate-determining step. This stability criterion is equivalent to the criterion derived by Wagner for the case of predominant cation diffusion in the scale.

• Research Organization: Oak Ridge National Lab., Tenn. (USA)
• DOE Contract Number: W-7405-ENG-26
• OSTI ID: 7364469
• Report Number(s): ORNL-5116
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALLOY SYSTEMS
BINARY ALLOY SYSTEMS
CATIONS
CHARGED PARTICLES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DIFFUSION
ELEMENTS
FLUIDS
INTERFACES
IONS
NONMETALS
OXIDATION
OXYGEN
PHYSICAL PROPERTIES
SOLUBILITY
STABILITY
THERMODYNAMIC PROPERTIES