| Effect of grain size on high-temperature oxidation behavior of Cu-80Ni alloy |
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| 作者姓名： | 曹中秋 牛焱 曹丽杰 吴维 |
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| 作者单位： | Department of Chemistry，State Key Laboratory for Corrosion and Protection，Department of Chemistry，State Key Laboratory for Corrosion and Protection Shenyang Normal University，Shenyang 110034，China，State Key Laboratory for Corrosion and Protection，Institute of Research Metals，Chinese Academy of Sciences，Shenyang 110015，China，Institute of Research Metals，Chinese Academy of Sciences，Shenyang 110015，China，Shenyang Normal University，Shenyang 110034，China，State Key Laboratory for Corrosion and Protection，Institute of Research Metals，Chinese Academy of Sciences，Shenyang 110015，China，Institute of Research Metals，Chinese Academy of Sciences，Shenyang 110015，China |
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| 基金项目： | Projects (5 98710 5 0and 5 0 0 710 5 8)supportedbytheNationalNaturalScienceFoundationofChina |
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| 摘 要： | 1 INTRODUCTIONTheoxidationofunalloyedcopperandnickelhasalreadybeenstudiedindetail.Whilethehigh tem peratureoxidationofCu Nialloys ,alsostudiedanumberoftimestodate13] ,isanexampleofarela tivelysimpleclassofscalingofbinaryalloysbyasin gleoxidant,becausethemetalsformacontinuousse riesofsolidsolutions ,whiletheiroxides ,CuO ,Cu2 OandNiO ,exhibitsmallmutualsolubilitiesandshowsignificantdifferencesinthethermodynamicstabilityandparabolicgrowthrates .Thus ,copper richalloysformexternalscales…
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Effect of grain size on high-temperature oxidation behavior of Cu-80Ni alloy |
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| CAO Zhong qi ,NIU Yan ,CAO Li jie ,WU Wei tao.Effect of grain size on high-temperature oxidation behavior of Cu-80Ni alloy[J].Transactions of Nonferrous Metals Society of China,2003,13(4). |
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| Authors: | CAO Zhong qi NIU Yan CAO Li jie WU Wei tao |
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| Affiliation: | CAO Zhong qi 1,2,NIU Yan 2,CAO Li jie 1,2,WU Wei tao) 2 |
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| Abstract: | The thermogravimetric analysis of binary Cu-80Ni alloys prepared respectively by conventional casting(CA) and mechanical alloying(MA) techniques and presenting widely different grain sizes was performed at 800 ℃ in air in order to study the effect of grain size change on the oxidation behavior of a solid solution alloy. The results show that the kinetic curves for the oxidation of the two alloys are complex and deviate from the parabolic rate law and usually are not composed of a single stage. Mixed scales were produced on the CACu-80Ni alloy surface, which consists of a mixture of copper and nickel oxides. However, oxide scale for MACu-80Ni alloy is mainly composed of a thick compact and continuous inner layer of nickel oxide. The reduction in the alloy grain size speeds up the diffusion of the more reactive component nickel from the alloy to alloy/oxide scale interface and completes the transition from a mixed scale to continuous scale of nickel oxide. |
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| Keywords: | copper nickel alloy Cu 80Ni alloy single phase high temperature oxidation |
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