Internal Oxidation of Binary Alloys

1985 ◽  
Vol 45 (6) ◽  
pp. 956-971 ◽  
Author(s):  
P. S. Hagan ◽  
R. S. Polizzotti ◽  
G. Luckman
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys

Numerical Model to Describe the Growth of the Internal Oxidation Layer in Binary Alloys

2006 ◽  
pp. 282-287
Author(s):  
Gabriel Plascencia ◽  
Torstein A. Utigard ◽  
Juliana Gutiérrez ◽  
David Jaramillo ◽  
Fernando Martínez
Keyword(s):  
Numerical Model ◽  
Internal Oxidation ◽  
Binary Alloys ◽  
Oxidation Layer

The internal oxidation of two-phase binary alloys under low oxidant pressures

1996 ◽  
Vol 45 (1-2) ◽  
pp. 51-76 ◽  
Author(s):  
Francesco Gesmundo ◽  
Furio Viani ◽  
Yan Niu
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys ◽  
Two Phase ◽  
Low Oxidant Pressures

A free boundary problem arising in the modelling of internal oxidation of binary alloys

1995 ◽  
Vol 6 (3) ◽  
pp. 225-245
Author(s):  
Bei Hu ◽  
Jianhua Zhang
Keyword(s):  
Free Boundary ◽  
Boundary Problem ◽  
Internal Oxidation ◽  
Free Boundary Problem ◽  
Binary Alloys ◽  
Local Existence ◽  
Discontinuous Coefficients ◽  
Parabolic Partial Differential Equation ◽  
One Dimensional ◽  
A Free Boundary Problem

A one-dimensional free boundary problem arising in the modelling of internal oxidation of binary alloys is studied in this paper. The free boundary of this problem is determined by the equation u = 0, where u is the solution of a parabolic partial differential equation with discontinuous coefficients across the free boundary. Local existence, uniqueness and the regularity of the free boundary are established. Global existence is also studied.

Transition from External to Internal Oxidation of Single Phase Binary Alloys

2006 ◽  
Vol 522-523 ◽  
pp. 45-52 ◽  
Author(s):  
Ye Dong He ◽  
Jing Ma ◽  
Zheng Wei Li ◽  
Wei Gao
Keyword(s):  
Internal Oxidation ◽  
Binary Alloys ◽  
Solute Concentration ◽  
Solid Solution Alloy ◽  
Binary Solid Solution ◽  
External Oxidation ◽  
Initial Stage ◽  
Pure Solvent ◽  
Thermodynamic Conditions ◽  
Solvent Metal

It is shown from the oxidation results that, for Fe-Cr, Ni-Cr, Co-Cr binary alloys with and without internal Cr2O3 precipitations after exposure, continuous external Cr2O3 scales formed on their surfaces, especially at the initial stage. It is therefore suggested that the transitions of oxidation for these alloys take place from externally to internally. There are two types of transitions for alloys: (1) the transition from temporary external oxidation to internal oxidation; and (2) the transition from permanent external oxidation to internal oxidation. The thermodynamic conditions for these transitions have been analyzed, and the criterion for prediction of the minimum solute concentration of a binary solid solution alloy required for the second transition has been derived. It is also suggested that the external oxide scale is an important factor to determine the formation of pure solvent metal nodules on the surfaces.

Numerical Model to Describe the Growth of the Internal Oxidation Layer in Binary Alloys

2006 ◽  
Vol 258-260 ◽  
pp. 282-287
Author(s):  
Gabriel Plascencia ◽  
Torstein A. Utigard ◽  
Juliana Gutiérrez ◽  
David Jaramillo ◽  
Fernando Martínez
Keyword(s):  
Internal Oxidation ◽  
Oxidation Process ◽  
Binary Alloys ◽  
Numerical Approach ◽  
Analytical Models ◽  
Oxidation Layer ◽  
Different Temperatures ◽  
Set Up ◽  
High Degree ◽  
Good Agreement

Several analytical models have been developed through the years to describe the formation and growth of the internal oxidation layer in binary alloys. Such models are often complex and their validity strongly rely on precise measurements of molar fluxes of the different species involved in the oxidation process. The main disadvantage of such measurements is that they are difficult to made and present a high degree of uncertainties, thus some assumptions are needed to ease understanding and the applicability of them. In this paper we set up a numerical scheme (finite differences) to describe the growth of the internal oxidation layer in binary Cu-Al alloys oxidized in air at different temperatures. There is good agreement between the experimental results and the values calculated with the aid of our numerical approach.

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