RELATIONSHIP BETWEEN MECHANISM OF DEFORMATION AND DEVELOPMENT OF DYNAMIC RECRYSTALLIZATION IN FEAL INTERMETALLIC

The influence of compression deformation on microstructure changes in the as-cast intermetallic alloy Fe-40 at.% Al doped with zirconium, boron and carbon was investigated in the temperature interval from 600 to 900 degrees C. It was established that the microstructural evolution depended essentially on the slip direction. In the temperature range 600-700 degrees C, where a[111]-type superdislocations operate, the formation of microbands proceeds and dynamic recrystallization develops only weakly. In contrast, in the temperature range 750-900 degrees C, where a[100]-type dislocations become the predominant mode of deformation, substructure formation takes place and dynamic recrystallization is activated abruptly, leading to a considerable refinement of the original structure. This effect is connected with the greater ability of perfect dislocations to climb in comparison with superdislocations.