首页|High temperature oxidation behavior of directionally solidified Fe(Al,Ta)/Fe2Ta(Al) eutectic composite
High temperature oxidation behavior of directionally solidified Fe(Al,Ta)/Fe2Ta(Al) eutectic composite
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NSTL
Elsevier
? 2022 Elsevier B.V.It is well known that Fe-Al intermetallic compounds have broad application prospects at high temperatures. The performance of Fe(Al,Ta)/Fe2Ta(Al) eutectic composite prepared by Bridgman directional solidification technology has been further improved as compared with that of Fe-Al intermetallic compounds. In this paper, high-temperature oxidation behaviors of directionally solidified Fe(Al,Ta)/Fe2Ta(Al) eutectic composite in static air were studied by isothermal oxidation test. The oxidized surface and cross section of directionally solidified Fe(Al,Ta)/Fe2Ta(Al) eutectic composite were characterized by scanning electron microscopy, X-ray diffraction and energy dispersive spectroscopy. The mechanism of high-temperature oxidation was analyzed from the point of view of kinetics and thermodynamics studies combined with the data of the Ellingham-Richardson diagram. The oxidation weight gain of the Fe(Al,Ta)/Fe2Ta(Al) eutectic composite at the same solidification rate is increased with temperature and Al2O3 is formed at the beginning of oxidation. However, a dense oxide film is not formed due to the small content of Aluminum, and the final oxide film for Fe(Al,Ta)/Fe2Ta(Al) eutectic composite after 100 hours′ oxidation is composed of Fe2O3 and Al3Fe5O12.
Fe(AlTa)/Fe2Ta(Al) eutectic compositeHigh temperature oxidationIsothermal oxidation kineticsOxidation mechanismSurface morphology
Cui C.、Zhang K.、Wu C.、Lai Y.、Wang Y.、Su H.
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School of Metallurgy Engineering Xi'an University of Architecture and Technology
State Key Laboratory of Solidification Processing Northwestern Polytechnical University
NSTL
Elsevier
