Изменение дислокационной структуры α-Fe в результате воздействия плазмы тлеющего разряда

Abstract

Представлены результаты исследований изменений дислокационной структуры α-Fe после воздействия тлеющего разряда. Установлено, что обработка в тлеющем разряде приводит к существенным изменениям дислокационной структуры на значительной глубине от облучаемой поверхности малодефектных в исходном состоянии материалов, что продемонстрировано на примере α-Fe. При этом выявлено, что закономерности формирования сложных дислокационных субструктур в результате воздействия плазмы тлеющего разряда близки к тем, которые наблюдаются при различных видах пластической деформации.

The purpose of this work consists in the investigation of a dislocation structure by the example of low defective materials under the impact of glow discharge plasma with the purpose of the development of new methods, technologies and automated devices for the creation of automated technological environment. To solve the problem specified there were chosen samples from α-Fe of 10mm thick which were subjected to annealing. To carry out the researches there was used transmission electron microscopy, raster electron microscopy and an X-ray structural analysis. It is defined experimentally that regularities in the formation of complex dislocation substructures after the impact of glowing discharge plasma are close to those ones which are observed at different kinds of plastic deformation. As in our case a plastic deformation does not occur then the results obtained confirm the hypothesis of that the value of scalar density of dislocations is a basic parameter having under control the formation of complex dislocation structures. A distinguishing peculiarity of dislocation structures observed at the impact of glowing discharge plasma is a high density of dislocation loops. The attention is drawn to the fact that dislocation loops are observed in α-Fe with low density of dislocations. The fact itself of dislocation loop presence (or absence) is rather significant for the clarification of the origin of substructure formation at the impact of glow discharge. The presence of loops may witness of the significant role of point defects.