Abstract
The martensitic phase transition onset is studied for noble metal binary beta brasses. The transformation mechanism, which is electronic, is determined by electron-phonon coupling in such metals. The composition dependence of structure stability is investigated, together with the connected role of ternary additions to the alloys. The donor-like and acceptor-like electronic behaviour is tested for a number of noble metal beta brasses. The results are in very good agreement with the available experimental data.

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