Formation of periodic nanodimensional structures on the surface of solids during phase and structural transformations

摘要

A study was conducted to demonstrate possibility of obtaining periodic nanodimensional structures in solids as a result of the relaxation of thermal stresses developed under the action of high-power laser radiation. The deformation of a crystalline solid in the presence of high stresses was accompanied by the accumulation of a residual strain whose appearance was related to inelastic effects and rearrangement of defects in the crystal structure. The relaxation of stresses exhibited heterogeneous character due to the formation of regions of new structure-relaxation zones in the old excited structure. This was related to the collective behavior of excited atoms interacting with each other, which made the relaxation process nonlinear. These relaxation zones represented groups of dislocations or disclinations, microcracks, clusters of atoms or vacancies, micropores, dislocation loops, and centers of new phase nucleation depending on the state of the system, conditions of external action, and degree of development of deformation process.