Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium

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	Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium
	X. Peng ; F. Wang
刊名	Corrosion Science
	2003
卷号	45 期号:10 页码:2293-2306
关键词	oxide growth oxidation CoCrAl yttrium magnetron-sputtering nanocoating fe-cr-al oxidation behavior reactive elements oxide scales alloys segregation resistance mechanism additions coatings
ISSN号	0010-938X
中文摘要	Nanostructured coatings exhibit superior oxidation resistance due to preferable formation of pure alpha-Al2O3 scale. In this work, the morphology and growth of the scale formed on magnetron-sputtered CoCrAl nanocoatings (NCs) with and without yttrium at 1000, 1100 and 1200 degreesC have been investigated in detail, by scanning electron microscopy observations of the time-dependent evolution of the scale surface and cross-sectional features. There were several observations: (1) intrinsic oxide ridges appeared on the surface scale on both NCs but their appearance was delayed on CoCrAlY, (2) CoCrAl coating tended to form a scale which was composed of multi-layered equiaxed crystals, especially at 1100 and 1200 degreesC, while the scale on CoCrAlY appeared double-layered and with inner columnar-like grains, (3) large interface cavities appeared after oxidation of CoCrAl at 1100 and 1200 degreesC but it was not be observed for oxidation of CoCrAlY. The results strongly suggest that the contribution of outward aluminum diffusion to the growth of the alpha-Al2O3 scale on both NCs is increased with an increase of time and temperature, and that it was reduced in the presence of yttrium. Additionally, compared to the scale on the normal commercial MCrAl (M = Fe, Ni, Co) alloys, the scale formed on the NCs is finer-grained and wrinkle-resistant. Based on the morphological investigation, a growth mechanism of the alumina scale on both NCs was proposed. (C) 2003 Published by Elsevier Ltd.
原文出处	://WOS:000185223200011
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/35997]
专题	金属研究所_中国科学院金属研究所
推荐引用方式 GB/T 7714	X. Peng,F. Wang. Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium[J]. Corrosion Science,2003,45(10):2293-2306.
APA	X. Peng,&F. Wang.(2003).Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium.Corrosion Science,45(10),2293-2306.
MLA	X. Peng,et al."Morphologic investigation and growth of the alumina scale on magnetron-sputtered CoCrAlNCs with and without yttrium".Corrosion Science 45.10(2003):2293-2306.