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Title: Composition at Al{sub 2}O{sub 3}/FeCrAl interfaces after high temperature oxidation

Abstract

Scanning Auger microscopy was used to study the chemistry of Al{sub 2}O{sub 3}/FeCrAl interfaces after the oxide scale had been removed in ultra high vacuum. Past studies that examined impurity segregation at these interfaces have shown a strong presence of sulfur, along with carbon and chromium enrichments. However, the relationships between these elements and the rate of their build up at the interface have not been addressed. This work examined many areas on several different specimens treated at various oxidation times, temperatures and with different cooling rates. Results showed that the carbon segregated during cooling. Interfacial sulfur and chromium concentrations varied at different locations that were not associated with apparent morphological differences, whether they were undulated ridges or valleys, voids, oxide-imprinted areas, alloy grain boundaries or different alloy grain faces. In most cases, there was a strong co-segregation of sulfur and chromium, although no sulfide particles were observed using scanning electron microscopy. At some locations, sulfur was found to segregate without the enrichment of chromium. The sulfur concentration could be low, as in the case of surface segregation in binary systems, or as high as being multi-layered. Results are analyzed in an attempt to recognize the structure of these segregantsmore » at the scale/alloy interface, such that their possible effect on scale adhesion may be better understood.« less

Authors:
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Director, Office of Science. Office of Basic Energy Studies. Division of Materials Sciences (US)
OSTI Identifier:
765468
Report Number(s):
LBNL-44784
Journal ID: ISSN 0947-5117; MTCREQ; R&D Project: 503001; TRN: AH200034%%149
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Journal Article
Journal Name:
Materials and Corrosion
Additional Journal Information:
Journal Volume: 51; Journal Issue: 5; Other Information: PBD: 9 Jan 2000; Journal ID: ISSN 0947-5117
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ALUMINIUM OXIDES; IRON ALLOYS; CHROMIUM ALLOYS; ALUMINIUM ALLOYS; INTERFACES; OXIDATION; SEGREGATION; CHEMICAL PROPERTIES; CARBON; SULFUR; CHROMIUM; SEGREGATION OXIDE/METAL INTERFACE OXIDATION ALUMINA

Citation Formats

Hou, Peggy Y. Composition at Al{sub 2}O{sub 3}/FeCrAl interfaces after high temperature oxidation. United States: N. p., 2000. Web. doi:10.1002/(SICI)1521-4176(200005)51:5<329::AID-MACO329>3.0.CO;2-K.
Hou, Peggy Y. Composition at Al{sub 2}O{sub 3}/FeCrAl interfaces after high temperature oxidation. United States. https://doi.org/10.1002/(SICI)1521-4176(200005)51:5<329::AID-MACO329>3.0.CO;2-K
Hou, Peggy Y. 2000. "Composition at Al{sub 2}O{sub 3}/FeCrAl interfaces after high temperature oxidation". United States. https://doi.org/10.1002/(SICI)1521-4176(200005)51:5<329::AID-MACO329>3.0.CO;2-K.
@article{osti_765468,
title = {Composition at Al{sub 2}O{sub 3}/FeCrAl interfaces after high temperature oxidation},
author = {Hou, Peggy Y},
abstractNote = {Scanning Auger microscopy was used to study the chemistry of Al{sub 2}O{sub 3}/FeCrAl interfaces after the oxide scale had been removed in ultra high vacuum. Past studies that examined impurity segregation at these interfaces have shown a strong presence of sulfur, along with carbon and chromium enrichments. However, the relationships between these elements and the rate of their build up at the interface have not been addressed. This work examined many areas on several different specimens treated at various oxidation times, temperatures and with different cooling rates. Results showed that the carbon segregated during cooling. Interfacial sulfur and chromium concentrations varied at different locations that were not associated with apparent morphological differences, whether they were undulated ridges or valleys, voids, oxide-imprinted areas, alloy grain boundaries or different alloy grain faces. In most cases, there was a strong co-segregation of sulfur and chromium, although no sulfide particles were observed using scanning electron microscopy. At some locations, sulfur was found to segregate without the enrichment of chromium. The sulfur concentration could be low, as in the case of surface segregation in binary systems, or as high as being multi-layered. Results are analyzed in an attempt to recognize the structure of these segregants at the scale/alloy interface, such that their possible effect on scale adhesion may be better understood.},
doi = {10.1002/(SICI)1521-4176(200005)51:5<329::AID-MACO329>3.0.CO;2-K},
url = {https://www.osti.gov/biblio/765468}, journal = {Materials and Corrosion},
issn = {0947-5117},
number = 5,
volume = 51,
place = {United States},
year = {Sun Jan 09 00:00:00 EST 2000},
month = {Sun Jan 09 00:00:00 EST 2000}
}