International Seminar on Mechanics and Mechanisms of Solid-Solid Phase Transformations
J. Phys. IV France 06 (1996) C1-75-C1-84
Structural Mechanism of Close-Packed Polytypes Formation at Displacive Type Phase Transformation in AlloysA.I. Ustinov
Institute for Metal Physics, 36 Vernadsky str., Kiev-142, 252680 Ukraine
Statistics of one-dimensional disordering of polytypes formed under phase transformation of a displacive type of Co-alloys was studied. Discovered polytypes with a short-range order in close-packed atomic layers allowed to propose a mechanism of their formation by noncoherent displacements in the initial polymorphous modification along close-packed planes. Signifiant dependence of polytype structures not only on alioying of an alloy but on the kinetics of a polymorphous transformation is considered as an indirect interaction of atomic layers via the impurities subsystem.
© EDP Sciences 1996