Microstructural effects on the high temperature oxidation of two-phase Cu-Cr alloys in 1 atm O-2

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	Microstructural effects on the high temperature oxidation of two-phase Cu-Cr alloys in 1 atm O-2
	G. Y. Fu; Y. Niu; F. Gesmundo
	2003
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	45 期号:3 页码:559-574
摘要	The oxidation of a Cu-Cr alloy containing about 60 wt% Cr and of two Cu-Cr alloys containing about 40 wt% Cr was studied at 700 and 800 degreesC in I atm. O-2. The 60 wt% Cr alloy was prepared by powder metallurgy (PM) and had a phase particle size of 50-150 mum. One of the two alloys containing about 40 wt% Cr was prepared by mechanical alloying (MA) and had a phase grain size ranging from 10-50 nm to 200-300 nm, depending on the location, while the other was prepared by magnetron sputtering (MS) and had a phase grain size around 5-10 nm. The most important difference between the oxidation behavior of the three alloys is the formation of an exclusive chromia scale on the surface of the Cu-40 wt% Cr alloy prepared by magnetron sputtering and of a continuous chromia layer beneath an outermost layer of copper oxides on the corresponding alloy prepared by mechanical alloying, while the Cu-60 wt% Cr alloy prepared by powder metallurgy formed complex scales composed mostly of CuO, Cu2O with Some Cu2Cr2O4 and Cr2O3. Thus, the microstructure of two-phase binary alloys has a strong effect of their oxidation behavior. In particular, a decrease of the alloy grain size favors the exclusive external oxidation of the most reactive component, reducing the corresponding critical content in the alloy. This effect is attributed to the presence of larger concentrations of rapid diffusion paths for the migration of the components in the alloy as well as to a faster dissolution of the particles of the Cr-rich phase in the copper matrix. (C) 2002 Elsevier Science Ltd. All rights reserved.
部门归属	inst met sci & technol, state key lab corros & protect, shenyang 110016, peoples r china. shenyang inst chem technol, shenyang, peoples r china.;niu, y (reprint author), inst met sci & technol, state key lab corros & protect, wencui rd 62, shenyang 110016, peoples r china
关键词	Oxidation Cu-cr Alloys Powder Metallurgy Mechanical Alloying Niagnetron Sputtering 2-phase Binary-alloys Most-reactive Component Possible Scaling Modes Low Oxidant Pressures Air Oxidation Ag Alloys Selective Oxidation Internal Oxidation H-2-h2s Mixtures Stainless-steel
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WOS记录号	WOS:000179976100006
引用统计	被引频次：35[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/321006/35830
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	G. Y. Fu,Y. Niu,F. Gesmundo. Microstructural effects on the high temperature oxidation of two-phase Cu-Cr alloys in 1 atm O-2[J]. Corrosion Science,2003,45(3):559-574.
APA	G. Y. Fu,Y. Niu,&F. Gesmundo.(2003).Microstructural effects on the high temperature oxidation of two-phase Cu-Cr alloys in 1 atm O-2.Corrosion Science,45(3),559-574.
MLA	G. Y. Fu,et al."Microstructural effects on the high temperature oxidation of two-phase Cu-Cr alloys in 1 atm O-2".Corrosion Science 45.3(2003):559-574.