THE SELF-EXCITED WAVE NATURE OF THE INSTABILITY AND LOCALIZATION OF PLASTIC-DEFORMATION

The nature of the localisation of plastic flow observed during deforma tion of crystalline solids is discussed. The nucleation and evolution of the zones of strain localisation have been shown to reveal certain trends which could be described as autowaves of different kinds initia ted by the processes of self-organization. Examples of self-excited wa ve processes, e.g., phase and excitement waves, that were observed exp erimentally by the deformation of mono-and polycrystalline metals and alloys are cited. Some of the numerical parameters of self-excited wav e processes have been evaluated. (C) 1997 Elsevier Science S.A.