Mechanism of Low-Temperature Ordering
in Equiatomic CuAu Alloy: II. Electron Microscopic Studies
of the First Stage of Ordering

N. D. Zemtsova and I. G. Kabanova

Institute of Metal Physics, Ural Division, Russian Academy of Sciences,
ul. S. Kovalevskoi 18, Ekaterinburg, 620219 Russia

Received June 25, 1996; in final form, June 13, 1997

Abstract—It was shown using electron diffraction methods that low-temperature ordering of an L1₀ phase in
a disordered fcc (CuAu) matrix proceeds by nucleation of tetragonal L1₀ domains in {110} planes with the
caxes of tetragonal domains lying out of the nucleation planes. At early stages of ordering, all 12 possible
domain orientations are observed. Due to interactions of elastic fields around the completely ordered domains
(within each grain), the microstructure formed at the later stage of two-phase ordering consists of domains of
four close orientations separated by regions of disordered matrix.

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