CRYSTAL DEFECTS AND GRAIN INTERFACE STRUCTURE OF ION-NITRIDED LAYERS

Observation under high resolution electron microscope shows that the continuous bombing ofhigh speed ions produces a great amount of vacant site defects.The assembly of vacanciesforms vacant dish,and the collapase of vacant dish forms stacking fault tetrahedrons and oth-er crystal defects.The interfaces between phase ε(Fe_(2-3)N)and phase γ'(Fe_4N)are smooth,straight and coherent,and they have the orientation relationships of(11)//(0001)and110]/110] .