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Precipitation of chromium in copper and copper-nickel base alloys

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Abstract

The precipitation of chromium-rich particles in Cu-Cr and Cu-Ni-Cr alloys has been studied by electron microscopy, electrical resistivity measurements and tensile testing. The results show that chromium precipitate has an fcc structure and the bcc structure previously proposed was not observed. A strong tendency for alignment of adjacent precipitates was observed in the ternary alloy but preferential precipitation on dislocations and grain boundaries showed that this was not due to spinodal decomposition. An alternative explanation based on elastic interactions is discussed. The resistivity results on the binary alloy shows no anomalous peaks in the early stages and were analyzed by the Avrami or Johnson-Mehl method to give the parametern = 1.5 and activation energy for growth of ~1.35 eV.

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Authors and Affiliations

  1. Royal Patents Office, London

    R. W. Knights (Patent Officer)

  2. Metallurgy Department, Manchester University, Manchester, England

    P. Wilkes (Lecturer)

Authors
  1. R. W. Knights
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  2. P. Wilkes
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Formerly in the Metallurgy Department, Manchester University

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Knights, R.W., Wilkes, P. Precipitation of chromium in copper and copper-nickel base alloys. Metall Trans 4, 2389–2393 (1973). https://doi.org/10.1007/BF02669380

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  • DOI: https://doi.org/10.1007/BF02669380

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