Oxidation of two three-phase Cu-30M-Cr alloys at 700-800 degrees C in 1 atm of pure oxygen

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	Oxidation of two three-phase Cu-30M-Cr alloys at 700-800 degrees C in 1 atm of pure oxygen
	Z. Q. Cao; Y. Shen; W. H. Liu; Y. Xue
	2006
发表期刊	Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing
ISSN	0921-5093
卷号	425 期号:1-2 页码:138-144
摘要	The oxidation of two ternary Cu-Ni-Cr alloys containing approximately 30 at.% and 40 at.% Cr, but with a similar 30 at.% Ni content, was studied at 700-800 degrees C in I atm of pure oxygen. The two alloys are composed of a mixture of three phases, where the medium gray beta phase with an intermediate chromium content forms the matrix and the lightest alpha phase with the largest copper and lowest chromium content forms large islands and has a rather large volume fraction, while dark gamma phase richest in chromium forms isolated particles dispersed in the other two phases, moreover, the gamma phase particles for the alloy containing 40 at.% Cr appear to have a precipitation of very small lighter particles. The kinetic curves for the two alloys deviate considerably from the parabolic rate law and are composed of a few of stages, where they show a large initial weight increase after which the rates decrease with time, until they become very small up to 24 h. Generally, the oxidation rates decrease by increasing the Cr content in the alloy under constant temperature and increase with temperature for a constant alloy composition. The alloy containing 30 at.% Cr produced an external scale mainly composed of a rather thick and discontinuous lighter layer of copper oxides. Beneath the external scale there is a dark and continuous layer of irregular chromia in thickness, which at some locations is followed by a thin dark layer of chromia directly in contact with the alloy. On the contrary, at other locations the scale forms deep protrusions into the alloy. The alloy containing 40 at.% Cr formed a lighter thick but discontinuous layer of copper oxides containing some nickel followed by an innermost region composed of a rather thick and continuous dark layer of regular and flat chromia. The formation of an external scale of chromia for the two alloys prevents alloys from being oxidized further. (c) 2006 Elsevier B.V. All rights reserved.
部门归属	shenyang normal univ, dept chem, shenyang 110034, peoples r china. chinese acad sci, state key lab corros & protect, inst met res, shenyang 110016, peoples r china.;cao, zq (reprint author), shenyang normal univ, dept chem, huanghe no st 253, shenyang 110034, peoples r china;caozhongqiu@yahoo.com
关键词	Cu-ni-cr Alloy Three-phase High-temperature Oxidation 2-phase Binary-alloys High-temperature Oxidation High Oxidant Pressures Possible Scaling Modes Cu-cr Alloys Internal Oxidation Air Oxidation O-2 700-900-degrees-c Beneath
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WOS记录号	WOS:000241151500018
引用统计	被引频次：14[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/321006/34137
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Z. Q. Cao,Y. Shen,W. H. Liu,et al. Oxidation of two three-phase Cu-30M-Cr alloys at 700-800 degrees C in 1 atm of pure oxygen[J]. Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,2006,425(1-2):138-144.
APA	Z. Q. Cao,Y. Shen,W. H. Liu,&Y. Xue.(2006).Oxidation of two three-phase Cu-30M-Cr alloys at 700-800 degrees C in 1 atm of pure oxygen.Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing,425(1-2),138-144.
MLA	Z. Q. Cao,et al."Oxidation of two three-phase Cu-30M-Cr alloys at 700-800 degrees C in 1 atm of pure oxygen".Materials Science and Engineering a-Structural Materials Properties Microstructure and Processing 425.1-2(2006):138-144.