Reversion of Nodules Formed by the Grain Boundary Reaction in Aluminium-Zinc. Alloys

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Abstract

THE grain boundary reaction is a phenomenon by which nodules with large lamellar precipitates grow from grain boundaries during artificial ageing of super-saturated solid solution alloys. It is called discontinuous or cellular precipitation by some workers. There have been many studies on the grain boundary reaction in aluminium-zinc alloys (Fig. 1). We have recently shown that the crystallographic orientation of nodules formed by the reaction is identical with that of the adjoining crystal grain, from which the nodules grow.1 However, the reversion process, which dissolves the lamellar precipitates in the nodules into matrix and reduces the nodules to the homogeneous solid solution, has not yet been reported.

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References

  1. 1

    Watanabe, R., and Koda, S., Nature, 183, 1667 (1959).

  2. 2

    Forty, A. J., and Gibson, J. G., Act. Met., 6, 137 (1958).

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WATANABE, R., KODA, S. Reversion of Nodules Formed by the Grain Boundary Reaction in Aluminium-Zinc. Alloys. Nature 184, 977 (1959) doi:10.1038/184977a0

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