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Title: High temperature oxidation behavior of FeAl intermetallics -- Oxide scales formed in ambient atmosphere

Abstract

Iron aluminides (Fe-Al) are intermetallic compounds that possess a number of advantages including low materials cost, conservation of Ni and Cr, relatively low densities, and good corrosion and oxidation resistances. The authors have studied the high temperature oxidation and sulfidation behaviors of Fe-Al, including isothermal and cyclic oxidation kinetics, scale structure and spallation tendency, and the reactive elements effects (REE) in an effort to use these materials in industries. This paper reports their results on the structures and formation mechanisms of the scales formed on Fe-Al during oxidation. The scales formed on alloys after exposure to high temperatures often have a complex structure and composition. It is known that when some alloys were oxidized in air at high temperatures, nitrides were formed underneath the oxide scale. It was reported that the oxidation of TiAl alloys in an ambient atmosphere led to the nitration of the base metal beneath the oxide scales. After a long exposure time a multilayered scale was formed which consisted of metal, Ti{sub 2}AlN, TiN, TiO{sub 2} and Al{sub 2}O{sub 3}. Cr was oxidized in air at 1,200 C, forming a Cr{sub 2}O{sub 3} scale with a layer of Cr{sub 2}N beneath the oxide. When binary Crmore » alloys containing Ti,Zr, or Nb were oxidized in air at 1,150 C, a layer or internally distributed Cr{sub 2}N formed beneath the oxide scales. However, the structures and formation mechanisms of these types of scales are not clear. The authors have also found that the scales formed on Fe-Al at 1,100 C in air have a complex structure containing nitrides. This paper reports the authors' studies on this subject.« less

Authors:
; ;
Publication Date:
Research Org.:
Univ. of Auckland (NZ)
OSTI Identifier:
20075987
Resource Type:
Journal Article
Journal Name:
Scripta Materialia
Additional Journal Information:
Journal Volume: 42; Journal Issue: 10; Other Information: PBD: 10 May 2000; Journal ID: ISSN 1359-6462
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; OXIDATION; IRON ALLOYS; ALUMINIUM ALLOYS; INTERMETALLIC COMPOUNDS; SCALING; TEMPERATURE RANGE 1000-4000 K; NITRIDES; PHOTOELECTRON SPECTROSCOPY

Citation Formats

Xu, C.H., Gao, W., and He, Y.D. High temperature oxidation behavior of FeAl intermetallics -- Oxide scales formed in ambient atmosphere. United States: N. p., 2000. Web. doi:10.1016/S1359-6462(00)00327-4.
Xu, C.H., Gao, W., & He, Y.D. High temperature oxidation behavior of FeAl intermetallics -- Oxide scales formed in ambient atmosphere. United States. doi:10.1016/S1359-6462(00)00327-4.
Xu, C.H., Gao, W., and He, Y.D. Wed . "High temperature oxidation behavior of FeAl intermetallics -- Oxide scales formed in ambient atmosphere". United States. doi:10.1016/S1359-6462(00)00327-4.
@article{osti_20075987,
title = {High temperature oxidation behavior of FeAl intermetallics -- Oxide scales formed in ambient atmosphere},
author = {Xu, C.H. and Gao, W. and He, Y.D.},
abstractNote = {Iron aluminides (Fe-Al) are intermetallic compounds that possess a number of advantages including low materials cost, conservation of Ni and Cr, relatively low densities, and good corrosion and oxidation resistances. The authors have studied the high temperature oxidation and sulfidation behaviors of Fe-Al, including isothermal and cyclic oxidation kinetics, scale structure and spallation tendency, and the reactive elements effects (REE) in an effort to use these materials in industries. This paper reports their results on the structures and formation mechanisms of the scales formed on Fe-Al during oxidation. The scales formed on alloys after exposure to high temperatures often have a complex structure and composition. It is known that when some alloys were oxidized in air at high temperatures, nitrides were formed underneath the oxide scale. It was reported that the oxidation of TiAl alloys in an ambient atmosphere led to the nitration of the base metal beneath the oxide scales. After a long exposure time a multilayered scale was formed which consisted of metal, Ti{sub 2}AlN, TiN, TiO{sub 2} and Al{sub 2}O{sub 3}. Cr was oxidized in air at 1,200 C, forming a Cr{sub 2}O{sub 3} scale with a layer of Cr{sub 2}N beneath the oxide. When binary Cr alloys containing Ti,Zr, or Nb were oxidized in air at 1,150 C, a layer or internally distributed Cr{sub 2}N formed beneath the oxide scales. However, the structures and formation mechanisms of these types of scales are not clear. The authors have also found that the scales formed on Fe-Al at 1,100 C in air have a complex structure containing nitrides. This paper reports the authors' studies on this subject.},
doi = {10.1016/S1359-6462(00)00327-4},
journal = {Scripta Materialia},
issn = {1359-6462},
number = 10,
volume = 42,
place = {United States},
year = {2000},
month = {5}
}