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Abstract
In this review we describe research in which field ion microscopy is used for the first time for a precision investigation of the structural and phase changes that occur in the surface layers of ordered and aging alloys as a result of implantation with ions of different gases. It is established that when ordered and aging solid solutions are irradiated with gas ions with an energy of 15–40 keV and doses of 1013–1018 ion/cm2 a structural phase transition occurs in the surface volume of the alloys. Radiationally disordered zones in the case of order-disorder transitions and ordered zones in the case of the reverse transition are detected and their dimensions are found. The atomic structure of the defects formed due to ion implantation are studied, these include radiationally disordered regions, dislocation configurations, dislocation loops and barriers, and also complexes of these defects localised in small volumes, and the segregation of atoms of one of the components. The structure of these defects in regions of single cascades of atomic displacements, their dimensions and mutual arrangement and their crystal-geometric characteristics are determined.
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