Grain size effects on the oxidation of two ternary Cu-Ni-20wt.% Cr alloys at 700-800 degrees C in 1 atm O-2

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	Grain size effects on the oxidation of two ternary Cu-Ni-20wt.% Cr alloys at 700-800 degrees C in 1 atm O-2
	Y. Niu; Z. Q. Cao; F. Gesmundo; G. Farne; G. Randi; C. L. Wang
	2003
发表期刊	Corrosion Science
ISSN	0010-938X
卷号	45 期号:6 页码:1125-1142
摘要	Two nanocrystalline two-phase Cu-Ni-Cr alloys, both prepared by mechanical alloying and containing about 20 at.% Cr but with different Ni contents (40 and 20 wt.%, respectively), have been oxidized in 1 atm O-2 at 700-800 degreesC. Their oxidation behavior has been compared with that of two cast alloys of the same composition, already studied previously, to examine the effects of a large reduction of the size of the individual phase grains and particles. The nanophase alloy with 40 wt.% Ni formed a flat external layer of chromia of regular thickness, while the corresponding cast alloy produced a very irregular chromia layer, often protruding deeply into the alloy, only after an initial stage of rather fast corrosion involving also copper and nickel, associated with some degree of internal oxidation. By oxidation at 700 degreesC the nanophase alloy with 20 wt.% Ni formed an irregular chromia layer associated with low corrosion rates. The corresponding cast alloy formed complex scales containing Cu, Ni and Cr oxides, extending into the alloy in the form of large pegs, even though a very irregular and discontinuous innermost chromia layer was still able to produce low corrosion rates. On the contrary, at 800 degreesC both alloys formed complex scales containing mixtures of the oxides of the three metal components. However, the scales grown on the cast alloy were much more irregular in thickness and formed large protrusions into the alloy. In spite of this, the corrosion kinetics of the nanophase 20 wt.% Ni alloy at 800 degreesC were more irregular and, except for an initial stage, less protective than that of the cast alloy with the same composition. (C) 2002 Published by Elsevier Science Ltd.
部门归属	chinese acad sci, inst met res, state key lab corros & protect, acad sinica, shenyang, peoples r china. univ genoa, dichep, i-16129 genoa, italy.;niu, y (reprint author), chinese acad sci, inst met res, state key lab corros & protect, acad sinica, wencui rd 62, shenyang, peoples r china;yniu@icpm.syb.ac.cn
关键词	Oxidation Ternary Alloys Nanophase Materials 2-phase Binary-alloys High-temperature Oxidation Most-reactive Component Possible Scaling Modes Low Oxidant Pressures 304 Stainless-steel Selective Oxidation Internal Oxidation Air Oxidation Ag Alloys
URL	查看原文
WOS记录号	WOS:000181786100002
引用统计	被引频次：12[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/321006/35976
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Niu,Z. Q. Cao,F. Gesmundo,et al. Grain size effects on the oxidation of two ternary Cu-Ni-20wt.% Cr alloys at 700-800 degrees C in 1 atm O-2[J]. Corrosion Science,2003,45(6):1125-1142.
APA	Y. Niu,Z. Q. Cao,F. Gesmundo,G. Farne,G. Randi,&C. L. Wang.(2003).Grain size effects on the oxidation of two ternary Cu-Ni-20wt.% Cr alloys at 700-800 degrees C in 1 atm O-2.Corrosion Science,45(6),1125-1142.
MLA	Y. Niu,et al."Grain size effects on the oxidation of two ternary Cu-Ni-20wt.% Cr alloys at 700-800 degrees C in 1 atm O-2".Corrosion Science 45.6(2003):1125-1142.