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Cyclic Oxidation of Sputter-Deposited Nanocrystalline Fe-Cr-Ni-Al Alloy Coatings

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Abstract

Nanocrystalline coatings of AISI 310S stainlesssteel with a small amount of Al were produced usingunbalanced magnetron-sputter deposition with a compositetarget. Cyclic oxidation tests were performed at 800 and 900°C in air for 100 hr. Theresults showed that Al2O3 scalesformed on the coatings containing ~3 wt.% Al. Theoxidation rate of the coated specimens was much lowerthan that of the uncoated specimens and the scale spallationresistance was also improved significantly. Studies withatomic force microscopy (AFM) of the transient-oxidationsurfaces suggested that grain-boundary andsubgrain-boundary diffusion in the coatings may have played animportant role in promoting the formation of theAl2O3 scale. Fast creep of thefine-grain coating and alumina scale was considered tobe the mechanism for the improvement in spallation resistance.

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Authors
  1. Zhenyu Liu
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  2. Wei Gao
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  3. Meishuan Li
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Liu, Z., Gao, W. & Li, M. Cyclic Oxidation of Sputter-Deposited Nanocrystalline Fe-Cr-Ni-Al Alloy Coatings. Oxidation of Metals 51, 403–419 (1999). https://doi.org/10.1023/A:1018835126181

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