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Grain Size Effects on the Oxidation of Two-Phase Cu-Fe-Al Alloys

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Abstract:

The oxidation behavior of thin layers of Fe-15Cu-5Al-0.3Y alloy with grain size in nanometer range, prepared by magnetron sputtering deposition on cast alloy of the same composition, was studied at700oC in 0.1MPa O2. The scales grown on the coatings consist of two layers. The outer layer is composed of an external continuous Fe oxides scale free from copper and aluminum oxides. The inner layer is very complicated, with formation of dark oxides of Fe and Al, coupled with light un-oxidized Cu-rich stringers elongated perpendicularly to the alloy surface. Some degree of internal oxidation of Fe and Al is also present within the coating layer. A grain size reduction can effectively promote the selective external oxidation of Fe.

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Periodical:

Advanced Materials Research (Volumes 391-392)

Pages:

611-614

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.391-392.611

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Online since:

December 2011

Authors:

Jun Huai Xiang, Wei Wang, Hong Hua Zhang, Yu Wei Liu

Keywords:

Coating, Grain Size, High-Temperature, Microcrystalline, Oxidation

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© 2012 Trans Tech Publications Ltd. All Rights Reserved

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