The use of two reactive elements to optimize oxidation performance of alumina-forming alloys

B. A. Pint; K. L. More; I. G. Wright

doi:10.1179/mht.2003.044

The use of two reactive elements to optimize oxidation performance of alumina-forming alloys

B. A. Pint, K. L. More, I. G. Wright

Oak Ridge National Laboratory

Research output: Contribution to journal › Article › peer-review

88 Scopus citations

Abstract

Standard reactive element (RE) studies have characterized the behavior of single RE additions such as Y, La or Hf. However, several commercial alumina-forming alloys are "co-doped" with two or more RE additions which allows the total amount of RE dopant in the alloy to be reduced. The oxidation performance of both commercial and laboratory-made co-doped alloys shows better scale adhesion and/or slower scale growth rates than comparable alloys with one RE addition. Characterization of the alumina scales showed no significant change in the grain structure with co-doping; however, as the total RE addition was reduced in co-doped alloys, a smaller volume of RE-rich oxides was observed within the scale. Quantification of the amount of RE ionic segregation on alumina scale grain boundaries formed on single doped and co-doped alloys showed similar amounts of segregation.

Original language	English
Pages (from-to)	375-386
Number of pages	12
Journal	Materials at High Temperatures
Volume	20
Issue number	3
DOIs	https://doi.org/10.1179/mht.2003.044
State	Published - Sep 1 2003

Keywords

Alumina scales
Reactive elements additions

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AB - Standard reactive element (RE) studies have characterized the behavior of single RE additions such as Y, La or Hf. However, several commercial alumina-forming alloys are "co-doped" with two or more RE additions which allows the total amount of RE dopant in the alloy to be reduced. The oxidation performance of both commercial and laboratory-made co-doped alloys shows better scale adhesion and/or slower scale growth rates than comparable alloys with one RE addition. Characterization of the alumina scales showed no significant change in the grain structure with co-doping; however, as the total RE addition was reduced in co-doped alloys, a smaller volume of RE-rich oxides was observed within the scale. Quantification of the amount of RE ionic segregation on alumina scale grain boundaries formed on single doped and co-doped alloys showed similar amounts of segregation.

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The use of two reactive elements to optimize oxidation performance of alumina-forming alloys

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