J. Phys. I France
Volume 3, Numéro 5, May 1993
Page(s) 1175 - 1186
DOI: 10.1051/jp1:1993263
J. Phys. I France 3 (1993) 1175-1186

New phase nucleus appearance on a twin boundary, which is with an invaribe velocity or oscillating

A. A. Bulbich1 and P. E. Pumpyan2

1  Laboratoire des Transitions de Phases, Facultt des Sciences, Universitb de Picardie, 80039 Amiens, France
2  Research Institute of Physics, Rostov University, 344104 Rostov-on-Don, Russia

(Received 12 March 1992, revised 18 December 1992, acrepTed 26 January 1993)

The occurrence and dynamics of a nucleus of a new phase on a moving twin boundary are described. The phase diagram of a nucleus on a moving twin boundary is obtained. It is shown that the nucleus can arise on the moving twin boundary only if its velocity tl is smaller than a certain value The existence of two kinds of low-symmetry phase trails (unstable and metastable) is described. The friction force, resulting from a trail and acting on a twin boundary is shown to arise. It is of a viscous type in the case of an unstable trail, and of a " dry " friction force type in the case of metastable trail. The oscillation of the twin boundary with the nucleus in the external periodic field, conjugated to the order parameter is described.

61.70N - 64.70K

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