Morphology evolution of alumina scales formed on NiAl with and without 0.5 at.% Ag at 1273K

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	Morphology evolution of alumina scales formed on NiAl with and without 0.5 at.% Ag at 1273K
	X. J. Zhang; W. T. Wu; J. T. Guo; Y. Niu
	2005
发表期刊	High Temperature Materials and Processes
ISSN	0334-6455
卷号	24 期号:1 页码:17-28
摘要	The transient oxidation behavior of beta-NiAl and NiAl-0.5Ag in 1 atm O-2 at 1273K was studied by thermogravimetry, giving special emphasis to the evolution of the morphology of the oxide scale, especially for what concerns the transformation of transient aluminas into the stable alpha-Al2O3 form. The oxidation kinetics can be described as being composed of three different parabolic stages for NiAl-0.5Ag and of two stages for beta-NiAl. Three different oxide morphologies are observed for the two alloys at different oxidation times. The SEM and XRD results show that the transient oxidation can be divided into two main stages, including the initial formation of gamma-Al2O3, which transforms quickly into theta-Al2O3, and the subsequent transformation of theta-Al2O3 into alpha-Al2O3. A combination of the results by XRD, EDAX and SEM shows that silver promotes the transformation of theta-Al2O3 into alpha-Al2O3, which is faster on NiAl-0.5Ag than on beta-NiAl.
部门归属	chinese acad sci, met res inst, state key lab corros & protect, shenyang 110016, peoples r china. shenyang inst chem technol, shenyang 110142, peoples r china.;zhang, xj (reprint author), chinese acad sci, met res inst, state key lab corros & protect, 62 wencui rd, shenyang 110016, peoples r china;xjzhang@imr.ac.cn
关键词	Beta-nial Silver Oxidation Gamma-al2o3 Theta-al2o3 Alpha-al2o3 Transformation Oxidation Behavior Transient Oxidation Intergranular Oxidation Isothermal Oxidation Ion-implantation Growth-mechanism Initial-stages Base Alloys Coatings Nickel
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WOS记录号	WOS:000226820900003
引用统计	被引频次：2[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/321006/35235
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. J. Zhang,W. T. Wu,J. T. Guo,et al. Morphology evolution of alumina scales formed on NiAl with and without 0.5 at.% Ag at 1273K[J]. High Temperature Materials and Processes,2005,24(1):17-28.
APA	X. J. Zhang,W. T. Wu,J. T. Guo,&Y. Niu.(2005).Morphology evolution of alumina scales formed on NiAl with and without 0.5 at.% Ag at 1273K.High Temperature Materials and Processes,24(1),17-28.
MLA	X. J. Zhang,et al."Morphology evolution of alumina scales formed on NiAl with and without 0.5 at.% Ag at 1273K".High Temperature Materials and Processes 24.1(2005):17-28.