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The structure of high-purity copper ingots nucleated at large undercoolings

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Abstract

The structures observed in small ingots of high-purity copper, nucleated at temperatures far below the melting point, have been studied. In contrast to other metals, no general recrystallisation is observed in high-purity copper even after nucleation 200° C below the melting temperature. The reasons for this are discussed and it is suggested that a dendrite arm re-melting process is a prerequisite for general recrystallisation. This requires a higher impurity content than the present copper ingots contained. Annealing treatments failed to produce a decrease in grain size despite the highly dislocated structure produced during freezing. The observed mechanisms of grain-boundary migration are discussed in terms of a recent theory by Gleiter, and confirm earlier evidence that many of the grains nucleated originally are in mutual twin orientation.

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Authors and Affiliations

  1. Australian Defence Scientific Service, Department of Supply, Defence Standards Laboratories, Victoria, Australia

    B. L. Jones & G. M. Weston

Authors
  1. B. L. Jones
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  2. G. M. Weston
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Jones, B.L., Weston, G.M. The structure of high-purity copper ingots nucleated at large undercoolings. J Mater Sci 5, 843–850 (1970). https://doi.org/10.1007/BF00574854

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