Abstract
The martensitic transformations in Cu-Zn-Al alloys undergoing the decomposition of β solid solution with the formation of rod-like α-phase or of plate-type bainite crystals have been studied by optical microscopy, electron microscopy and electron-probe microanalysis. The fine structure of the phases formed upon the partial decomposition of the β-phase and upon the subsequent martensitic transformation was studied. The β→α transformation was shown to occur in a crystallographically ordered manner and to obey the Kurdyumov-Sachs orientation relationships. The β→α transformation includes features of both diffusional and martensitic transformations. The α-phase formation includes a crystals lattice reconstruction and the nucleation dislocations in periodically arranged slip planes. At the same time, the shape of the α-phase crystals and their coalescence and changes in chemical composition are typical of diffusional transformation. The interactions of martensite crystals with particles of the a phase and bainite crystals were studied.
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