STRUCTURAL TRANSITION IN FE-CR ALLOYS UNDER HIGH-DOSE ION IRRADIATION

Radiation-induced structural transitions have been found in both model and commercial alloys of the Fe-Cr system. It was shown that the spec ific nonequilibrium state of a material is formed due to this transiti on. The indication of the transition is X-ray effects which show the a ppearance of the heterogeneity in formerly homogeneous equilibrium str ucture within some interval of irradiation parameters. Significant and sometimes anomalously large changes in material properties accompany the transition to specific nonequilibrium state of the material. As a result of the transition the unusual ordered microstructures were obse rved, The features of the nonequilibrium state permit us to identify i t as the structure which is characteristic for open system.