The steady-state corrosion kinetics of single-phase binary alloys with a solubility gap forming the most-stable oxide
- Universita di Genova (Italy)
The steady-state, high-temperature oxidation kinetics of single-phase alloys rich in a most-reactive component B in binary A-B systems presenting a limited solubility of the two components (beta-phase alloys) have been examined assuming the exclusive formation of the most-stable oxide BO{sub v}. Alloys sufficiently rich in B can form external BO{sub v} scales directly in contact with the beta phase, while below a critical B content the growth of BO{sub v} involves also the appearance of an intermediate layer of B-depleted solid solution of B in A (alpha phase). The parabolic rate constants for the oxidation of single-phase beta alloys are lower than those of alloys of identical B content which are single-phase over the whole range of composition (solid-solution alloys) but higher than for two-phase alpha + beta alloys under the same values of all the relevant parameters. Moreover, the tendency of single-phase beta alloys to form the most-stable oxide simultaneously as an external scale and internally to the alloy is greater than for solid-solution alloys but smaller than for two-phase alloys.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 518355
- Journal Information:
- Oxidation of Metals, Journal Name: Oxidation of Metals Journal Issue: 3-4 Vol. 47; ISSN OXMEAF; ISSN 0030-770X
- Country of Publication:
- United States
- Language:
- English
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