Effect of the theta-alpha-Al2O3 transformation in scales on the oxidation behavior of a nickel-base superalloy with an aluminide diffusion coating

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	Effect of the theta-alpha-Al2O3 transformation in scales on the oxidation behavior of a nickel-base superalloy with an aluminide diffusion coating
	T. F. An ; H. R. Guan ; X. F. Sun ; Z. Q. Hu
刊名	Oxidation of Metals
	2000
卷号	54 期号:3-4 页码:301-316
关键词	beta-NiAl diffusion coating alpha-Al2O3 theta-Al2O3 oxidation mechanism al-y alloys fe-cr-al intergranular oxidation transient oxidation high-temperature morphology mechanisms yttrium
ISSN号	0030-770X
中文摘要	The high-temperature oxidation behavior of a nickel-base superalloy and aluminide-diffusion coating has been investigated over the temperature range from 800-1100 degrees C and analyzed by TGA, XRD, EDAX, and SEM. The beta-NiAl coating was formed by low-pressure gas-phase cementation at 950 degrees C for 3 hr. It was found that the formation of alpha-Al2O3 from theta-Al2O3 on the beta-NiAl coating resulted in a sharp decrease in the parabolic rate constant k(p) by one order of magnitude at 1050 degrees C during transient oxidation. The transformation caused the anomalous behavior of the oxidation kinetics curves of this diffusion coating in the temperature range 800-1100 degrees C within the first 100 hr. A change in the morphology of scales also occurred with the transformation. A growth stress was characterized by the formation of convoluted scales, which were observed on the surface after oxidation. The oxidation mechanism of this beta-NiAl diffusion coating is described.
原文出处	://WOS:000088799600007
公开日期	2012-04-14
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/36968]
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	T. F. An,H. R. Guan,X. F. Sun,et al. Effect of the theta-alpha-Al2O3 transformation in scales on the oxidation behavior of a nickel-base superalloy with an aluminide diffusion coating[J]. Oxidation of Metals,2000,54(3-4):301-316.
APA	T. F. An,H. R. Guan,X. F. Sun,&Z. Q. Hu.(2000).Effect of the theta-alpha-Al2O3 transformation in scales on the oxidation behavior of a nickel-base superalloy with an aluminide diffusion coating.Oxidation of Metals,54(3-4),301-316.
MLA	T. F. An,et al."Effect of the theta-alpha-Al2O3 transformation in scales on the oxidation behavior of a nickel-base superalloy with an aluminide diffusion coating".Oxidation of Metals 54.3-4(2000):301-316.