| Abstract: | Within the generalized axial finite-dimensional Ising model, possible model and experimental non-equilibrium polytype 3C-2H
and 9R-3C transformations and twinning of the fcc-lattice of close-packed model crystals are considered. These transformations
are realized in a great number of metals as well as cobalt, iron, and copper-base alloys and observed on variation of both
the applied load and the temperature. The structure transformations simulated in the model may involve a number of multilayer
metastable structures. Hysteresis phenomena found under variations of the external stress and temperature and their behavior
in response to long-range interactions corresponding to atomic interactions in the fcc lattice in ten coordination spheres
and in many-body interaction responsible for the stability of the 4H structure are considered. Factors accounting for the
formation of metastable states and hysteresis effects are analyzed. It is shown that the crystal form may undergo a non-monotonic
change as the applied load and temperature are varied.
Siberian Physicotechnical Institute at Tomsk State University. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Fizika,
No. 9, pp. 80–86, September 1999. |
