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The Air Oxidation of Two-Phase Fe-Cu Alloys at 600-800°C

Authors
  • Gesmundo, F.
  • Niu, Y.
  • Oquab, D.
  • Roos, C.
  • Pieraggi, B.
  • Viani, F.
Type
Published Article
Journal
Oxidation of Metals
Publisher
Kluwer Academic Publishers-Plenum Publishers
Publication Date
Feb 01, 1998
Volume
49
Issue
1-2
Pages
115–146
Identifiers
DOI: 10.1023/A:1018861804007
Source
Springer Nature
Keywords
License
Yellow

Abstract

The air oxidation of three Fe-Cu alloyscontaining 25, 50, and 75 wt.% Cu has been studied at600-800°C. The oxidation followed the parabolic lawonly approximately with rates lower than those of thepure constituent metals. The scales were alwayscomposed of an inner layer containing a mixture ofcopper metal and iron oxide and of an outer oxide layerwhose composition depended on the copper content of the alloy. For the two alloys richer in ironthe external layer was composed mostly of iron oxideswith some copper-rich particles which oxidized only inthe external-scale zone. For the alloy richest in copper the external layer contained a complexmixture of iron oxides, copper particles and doubleFe-Cu oxides surmounted by an outermost copper-oxidelayer. No significant iron depletion was observed in the alloys beneath the region of internaloxidation. The peculiar scale microstructure observedfor these alloys is considered mainly as a consequenceof their two-phase microstructure and of the limited solubilities of the two components in oneanother.

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