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High resolution study of ordering reactions in gold-chromium alloys

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Abstract

The ordering reactions in Au4Cr and Au3Cr alloys have been investigated using high resolution dark field and lattice imaging techniques. In all cases the ordered structures can be described in terms of compositional modulations as occur during spinodal decomposition. In alloys quenched from above the critical temperature sro microdomains of size 10 to 15Å have been resolved with structures represented by modulations in composition along <420>. After aging the Au4Cr alloy belowT c the Dla lro phase appears as ordered domains of size 50 to 100Å showing composition modulations with wavelength of 5d<531>. These domains grow in size up to 500Å becoming finally the D1a fully ordered structure. A new observation has been mdde in the Au3Cr alloy,viz that the lro structure is nonstoichiometricL10 withλ [001] = 4Å. The transformation from sro in this alloy occurs with the formation of a transitional ordered phase, (similar toDO 22, which can be described in terms of composition modulations along [001], with wavelength equal to thec parameter (8Å) of theDO 22 structure. Lattice imaging of the two variants of superlattice planes in ordered Au4Cr enabled the atomic arrangement in the area of translational and rotational antiphase boundaries to be determined.

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Authors and Affiliations

  1. Institute of Metallurgy, Polish Academy of Sciences, Poland

    J. Dutkiewicz (Reasearch Metallurgist)

  2. University of California, Berkeley

    G. Thomas (Professor of Metallurgy)

Authors
  1. J. Dutkiewicz
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  2. G. Thomas
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J. Dutkiewicz is on one year leave from the Institute of Metallurgy, Polish Academy of Sciences, 30-059 Krackow, ul. Reymonta 25, Poland.

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Dutkiewicz, J., Thomas, G. High resolution study of ordering reactions in gold-chromium alloys. Metall Trans A 6, 1919 (1975). https://doi.org/10.1007/BF02646857

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  • DOI: https://doi.org/10.1007/BF02646857

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