The effect of Cr on the oxidation of Ni-10 at% Al in 1 atm O-2 at 900-1000 degrees C

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	The effect of Cr on the oxidation of Ni-10 at% Al in 1 atm O-2 at 900-1000 degrees C
	X. J. Zhang; S. Y. Wang; F. Gesmundo; Y. Niu
	2006
发表期刊	Oxidation of Metals
ISSN	0030-770X
卷号	65 期号:3-4 页码:151-165
摘要	The oxidation of three Ni - xCr - 10Al alloys with a constant Al content of 10 at% and containing 3, 5, and 10 at% Cr was investigated at 900 - 1000 degrees C in 1 atm of pure oxygen and compared to the behavior of Ni - 10Al. At both temperatures, an external NiO scale overlying a zone of internal-oxide precipitates formed on Ni - 10Al and Ni - 3Cr - 10Al: in addition, a discontinuous Al2O3 layer formed at the front of the internal oxidation for Ni - 3Cr - 10Al. An exclusive external scale of Al2O3 formed at most places on Ni - 5Cr - 10Al at 900 degrees C, while, at some sites, the same alloy formed an outer NiO layer overlying an internal oxidation zone. The scales formed on Ni - 5Cr - 10Al at 1000 degrees C were complex, but eventually a protective Al2O3 layer developed either at the alloy surface or beneath a region containing a mixture of different oxides. Finally, an exclusive external Al2O3 layer formed on Ni - 10Cr - 10Al at both temperatures. Thus, the addition of sufficient chromium to Ni - 10Al produced a classical third-element effect, inducing the transition between internal and external oxidation of aluminum under a constant Al content. A possible mechanism for the effect of chromium on the oxidation of Ni - 10Al is discussed on the basis of an extension to ternary alloys of a criterion first proposed by Wagner for the transition between internal and external oxidation of the most-reactive component in binary alloys.
部门归属	inst met sci & technol, state key lab corros & protect, shenyang 110016, peoples r china. shenyang inst chem technol, shenyang 110142, peoples r china. univ genoa, dochep, i-16129 genoa, italy.;niu, y (reprint author), inst met sci & technol, state key lab corros & protect, wencui rd 62, shenyang 110016, peoples r china;yniu@imr.ac.cn
关键词	Ternary Alloys Ni-cr-al Oxidation Chromium Effect Aluminum Alloys
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WOS记录号	WOS:000241356400001
引用统计	被引频次：24[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/321006/34717
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	X. J. Zhang,S. Y. Wang,F. Gesmundo,et al. The effect of Cr on the oxidation of Ni-10 at% Al in 1 atm O-2 at 900-1000 degrees C[J]. Oxidation of Metals,2006,65(3-4):151-165.
APA	X. J. Zhang,S. Y. Wang,F. Gesmundo,&Y. Niu.(2006).The effect of Cr on the oxidation of Ni-10 at% Al in 1 atm O-2 at 900-1000 degrees C.Oxidation of Metals,65(3-4),151-165.
MLA	X. J. Zhang,et al."The effect of Cr on the oxidation of Ni-10 at% Al in 1 atm O-2 at 900-1000 degrees C".Oxidation of Metals 65.3-4(2006):151-165.