The oxidation behavior of iron aluminides at 1300{degrees}C
The oxidation behavior of iron-aluminum alloys, in air and oxygen, at 1300{degrees}C has been studied with particular emphasis on the time to loss of protectiveness with onset of breakaway attack. The role of alloy aluminum content between 8.4 and 15.8 w/o and of the addition of a reactive element, zirconium, up to 0.2 w/o, were examined. The periods over which the oxide scales remained protective were quantitatively correlated with aluminum depletion in the alloy substrate. Times to the onset of breakaway for Fe{sub 3}Al-Zr have been compared with those for commercial ODS FeCrAl alloys containing Y{sub 2}O{sub 3} (MA 956, PM 2000, ODM 751). Characterization of the oxidation of the Fe3Al-Zr alloys was undertaken using a range of surface analytical procedures, including x-ray diffraction, optical microscopy, scanning and scanning transmission electron microscopy with associated energy dispersive x-ray spectroscopy, and electron microprobe analysis.
- Research Organization:
- Oak Ridge National Lab., TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC05-96OR22464
- OSTI ID:
- 390636
- Report Number(s):
- CONF-960928--1; ON: DE97000023
- Country of Publication:
- United States
- Language:
- English
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