Long-period superlattices in the copper-gold system as two-phase mixtures

Details Long-period superlattices in the copper-gold system as two-phase mixtures Long-period superlattices in the copper-gold system as two-phase mixtures

Feb 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980mta....11..247w&link_type=abstract

Metallurgical Transactions A, Volume 11, Issue 2, pp.247-253

Computer Science

4

Scientific paper

We have shown that a coherent two-phase mixture of ordered Cu3Au and the solid solution is better able to account for the observations on the complex structure (a long-period superlattice) which forms in the two-phase field around 30 at. pct Au than the structure proposed by Scott. In our structure we are replacing the antiphase boundaries in Scott’s structure with a few layers of the solid solution. In some measure it is the interfacial and the elastic coherency energies that are responsible for the details of this structure. These effects cause the observed two-phase field to be only 2.5 at. pct wide, compared with 10 pct for the equilibrium two-phase field. We have constructed a model that explains how this structure forms. From these results we expect that most of the socalled long-period superlattices are really two-phase mixtures of similar geometry. More generally, we expect that many of the complex, closely spaced phases that have been observed in some alloy systems can be similarily interpreted when the required analysis is carried out. In particular, our conclusions concerning the Fe-Al system are of a distinctly different character than those of Allen and Cahn.

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