Martensitic structures in ordered Cu—Zn—A1 alloys

It is shown by the electron - diffraction technique that the type of martensitic structure formed in aquenched Cu$_{68}$—Zn$_{15}$—Al$_{17}$ alloy correlates with the type of ordering in the initial solid solution. M18R martensite forms in a solid solution ordered in the type Fe$_3$Al(DO$_3$), and a metastable Sato structure in the case of solid - solution ordering after the type CsCl(B2). This difference in the structures of the phases that are formed relates to differences in the phonon vibrational spectrum of the original solid solution.