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On the exclusive growth of external chromia scale on the novel electrodeposited Cu–Ni–Cr nanocomposites

Published online by Cambridge University Press:  31 January 2011

Z. Huang ,
X. Peng ,
C. Xu  and
F. Wang
Z. Huang
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
X. Peng*
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
C. Xu
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
F. Wang
Affiliation:
State Key Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
*
a)Address all correspondence to this author. e-mail: xpeng@imr.ac.cn
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Abstract

Novel metal-matrix nanocomposites (MMNCs) of Cu–30Ni–20Cr and Cu–50Ni–20Cr (by wt%), having a nanocrystalline Cu–Ni solid solution matrix with the dispersion of Cr nanoparticles, were fabricated by coelectrodeposition. Both nanocomposites exclusively grew external chromia scale during oxidation at 800 °C in air. The codeposited Cr nanoparticles, together with the numerous grain boundaries in the Cu–Ni matrix, promoted the establishment of a continuous chromia scale during the initial and transient oxidation stage, and then they functioned as “a reservoir” supplying sufficient Cr flux for the exclusive growth of the scale during the steady-state stage. The theoretical treatment using a two-phase alloy oxidation model indicates that high Cr diffusivity correlated with the persistence of an ultrafine-grained structure of the Cu–Ni matrix during oxidation is crucial to the exclusive chromia growth. Ni content increase did not significantly affect the chromia scale formation. This is fundamentally different from the oxidation of conventional Cu–Ni–Cr alloys investigated for comparison.

Keywords

CompositeOxidationNanostructure
Type
Articles
Information
Journal of Materials Research , Volume 22 , Issue 11 , November 2007 , pp. 3166 - 3177
Copyright
Copyright © Materials Research Society 2007

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