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Revelation of solid solubility limit Fe/Ni = 1/12 in corrosion resistant Cu-Ni alloys and relevant cluster model

Published online by Cambridge University Press:  31 January 2011

Chuang Dong*
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams, School of Materials Science & Engineering, Dalian University of Technology, Dalian 116024, Peoples’ Republic of China
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Minor Fe additions are necessary to enhance the corrosion resistance of commercial Cu-Ni alloys. The present paper aims at optimizing the Fe content in three alloy series Cu90(Ni,Fe)10, Cu80(Ni,Fe)20, and Cu70(Ni,Fe)30 (at.%) from the viewpoint of their corrosion performance in a 3.5% NaCl solution. An Fe/Ni = 1/12 solid solubility limit line was revealed in the Cu-Ni-Fe phase diagram. Three Fe/Ni = 1/12 alloys, Cu90Ni9.23Fe0.77 (at.%) = Cu-8.6Ni-0.7Fe (wt.%), Cu80Ni18.46Fe1.54 = Cu-17.3Ni-1.4Fe, and Cu70Ni27.7Fe2.3 = Cu-26.2Ni-2.1Fe, show the best corrosion performances in their respective alloy series. The Fe/Ni = 1/12 solubility limit is explained by assuming isolated Fe-centered FeNi12 cuboctahedral clusters embedded in a Cu matrix. The three Fe/Ni = 1/12 alloys can be respectively described by cluster formulas [Fe1Ni12]Cu117, [Fe1Ni12]Cu52, and [Fe1Ni12]Cu30.3. The Fe/Ni = 1/12 rule may serve an important guideline in the industrial Cu-Ni alloy selection because above this limit, easy precipitation would negate the corrosion properties of the Cu-Ni-based alloys.


Copyright © Materials Research Society 2010

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1.Pearson, C.Role of iron in the inhibition of corrosion of marine heat exchangers. Br. Corros. J. 7, 61 (1972)CrossRefGoogle Scholar
2.Stewart, W.C., LaQue, F.L.Corrosion-resisting characteristics of iron-modified 90-10 cupro-nickel alloy. Corros. 8, 259 (1952)CrossRefGoogle Scholar
3.Efird, K.D.The synergistic effect of Ni and Fe on the seawater corrosion of copper alloy. Corros. 33, 347 (1977)CrossRefGoogle Scholar
4.Drolenga, L.J.P., Ijsseling, F.P.The influence of alloy composition and microstructure on the corrosion behaviour of Cu-Ni alloys in seawater. Mater. Corros. 34, 167 (1983)CrossRefGoogle Scholar
5.Bailey, G.L.Copper-nickel iron alloys resistant to sea-water corrosion. J. Inst. Met. 79, 243 (1951)Google Scholar
6.Popplewell, J.M., Hart, R.J.The effect of iron on the corrosion characteristics of 90-10 cupronickel in quiescent 3.4% sodium chloride solution. Corros. Sci. 13, 295 (1973)CrossRefGoogle Scholar
7.Swartzendruber, L.J.Phase Diagram of Binary Iron Alloys (ASM International, Materials Park, OH 1993)131Google Scholar
8.Servant, C., Sundman, B., Lyon, O.Thermodynamic assessment of the Cu-Fe-Ni system. Calphad 25, 79 (2001)Google Scholar
9.Gupta, K.P.The Cu-Fe-Ni (Copper-Iron-Nickel) System, Phase Diagrams of Ternary Nickel Alloys (Indian Institute of Metals, Calcutta 1990)290Google Scholar
10.North, R.F., Pryor, M.J.The influence of corrosion product structure on the corrosion rate of Cu-Ni alloys. Corros. Sci. 10, 297 (1970)CrossRefGoogle Scholar
11.Hume-Rothery, W.The Structure of Metals and Alloys (The Institute of Metals, London 1969)Google Scholar
12.Singh, V.A., Zunger, A.Phenomenology of solid solubilities and ion-implantation sites: An orbital-radii approach. Phys. Rev. B 25, 907 (1982)Google Scholar
13.Chelikowsky, J.R.Solid solubilities in divalent alloys. Phys. Rev. B 19, 686 (1979)Google Scholar
14.Alonso, J.A., Simozar, S.Prediction of solid solubility in alloys. Phys. Rev. B 22, 5583 (1980)Google Scholar
15.Clapp, P.C.Atomic configurations in binary alloys. Phys. Rev. B 4, 255 (1971)CrossRefGoogle Scholar
16.Büth, J., Inden, G.Structure and properties of spinodally decomposed Cu-Ni-Fe alloys. Acta Mater. 30, 213 (1982)Google Scholar
17.Bragg, W.L., Williams, E.J.The effect of thermal agitation on atomic arrangement in alloys. Proc. R. Soc. London, Ser. A 145, 699 (1934)Google Scholar
18.Bethe, H.A.Statistical theory of superlattices. Proc. R. Soc. London, Ser. A 150, 552 (1935)Google Scholar
19.Peierls, R.Statistical theory of superlattices with unequal concentrations of the components. Proc. R. Soc. London, Ser. A 154, 207 (1936)Google Scholar
20.Kirkwood, J.G.Order and disorder in binary solid solutions. J. Chem. Phys. 6, 70 (1938)Google Scholar
21.Cowley, J.M.An approximate theory of order in alloys. Phys. Rev. 77, 669 (1950)Google Scholar
22.Dong, C., Wang, Q., Qiang, J.B., Wang, Y.M., Jiang, N., Han, G., Li, Y.H., Wu, J., Xia, J.H.From clusters to phase diagrams: Composition rules of quasicrystals and bulk metallic glasses. J. Phys. D: Appl. Phys. 40, R273 (2007)CrossRefGoogle Scholar
23.Xia, J.H., Qiang, J.B., Wang, Y.M., Wang, Q., Dong, C.Ternary bulk metallic glasses formed by minor alloying of Cu8Zr5 icosahedron. Appl. Phys. Lett. 88, 101907 (2006)CrossRefGoogle Scholar
24.Miracle, D.B.The efficient cluster packing model—An atomic structural model for metallic glasses. Acta Mater. 54, 4317 (2006)Google Scholar
25.Takeuchi, A., Inoue, A.Calculations of mixing enthalpy and mismatch entropy for ternary amorphous alloy. Mater. Trans., JIM 41, 1372 (2000)Google Scholar
26.Gavriljuk, V.G., Shanina, B.D., Berns, H.On the correlation between electron structure and short range atomic order in iron-based alloys. Acta Mater. 48, 3879 (2000)Google Scholar
27.Sedriks, A.J.Advanced materials in marine environments. Mater. Perform. 33, 56 (1994)Google Scholar