Transient of alumina oxide scale on beta-NiAl coated on M38G alloy at 950 degrees C

IMR OpenIR

	Transient of alumina oxide scale on beta-NiAl coated on M38G alloy at 950 degrees C
	G. M. Liu; M. S. Li; M. Zhu; Y. C. Zhou
	2007
发表期刊	Intermetallics
ISSN	0966-9795
卷号	15 期号:10 页码:1285-1290
摘要	The phase transformation of alumina formed during oxidation of beta-NiAl coating prepared on M38G alloy by pack cementation was investigated. Oxidation experiments were conducted at 950 degrees C for various times from 2 to 180 min. The phase composition and microstructure of the oxide scales were investigated by using glancing angle XRD, AFM and SEM. The results showed that at the initial oxidation stage needle-like theta-Al2O3 was formed and then it covered the sample surface rapidly. The formation of alpha-Al2O3 grains beneath the theta-Al2O3 layer was favored by depletion of Al in the beta-NiAl coating during oxidation. alpha-Al2O3 preferred growing on the top (ridge) of beta-NiAl grains, which resulted in the formation of net-like alpha-Al2O3 inner layer. With increasing time, theta-Al2O3 transformed to alpha-Al2O3 gradually. After 180 min oxidation, most of alpha-Al2O3 grains transformed into alpha-Al2O3. A mechanism of excessive voids' formation at the oxide/coating interface was also proposed in this paper. (c) 2007 Elsevier Ltd. All rights reserved.
部门归属	chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china. sch mat sci & engn, nanchang inst aeronaut technol, nanchang 330034, peoples r china.;li, ms (reprint author), chinese acad sci, shenyang natl lab mat sci, inst met res, shenyang 110016, peoples r china;mshli@imr.ac.en
关键词	Nickel Aluminides Coatings Based On Nial Oxidation Intermetallic And Otherwise Phase Transformations High-temperature Oxidation Theta-alpha-al2o3 Transformation Behavior Coatings Superalloy Transition Layers
URL	查看原文
WOS记录号	WOS:000249622300002
引用统计	被引频次：28[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/33700
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. M. Liu,M. S. Li,M. Zhu,et al. Transient of alumina oxide scale on beta-NiAl coated on M38G alloy at 950 degrees C[J]. Intermetallics,2007,15(10):1285-1290.
APA	G. M. Liu,M. S. Li,M. Zhu,&Y. C. Zhou.(2007).Transient of alumina oxide scale on beta-NiAl coated on M38G alloy at 950 degrees C.Intermetallics,15(10),1285-1290.
MLA	G. M. Liu,et al."Transient of alumina oxide scale on beta-NiAl coated on M38G alloy at 950 degrees C".Intermetallics 15.10(2007):1285-1290.