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By A M Glezer; I E Permi︠a︡kova

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5). This weak contrast is clearly visible in, for example, Fig. 5b (region A). It may be seen that the detected contrast is banded and is not the consequence of the effects of selective etching of the APB in the preparation of the thin foils because it is of the diffraction nature. Later, this contrast in Fig. 5 will be referred to as anomalous. The anomalous contrast completely disappears after annealing at 300°C and higher temperatures. a b 1 μm 1 μm Fig. 5. Dark field images of the section of the crystal of the Sendast alloy under the effect of superstructural reflections 111 (a) and 222 (b).

There is a number of interesting special features of the structure of the antiphase boundaries in the melt-quenched superstructures. 1. The formation or disappearance of the effects of local deformation of the crystal lattice in the regions in the vicinity of the boundaries. It is justified to claim that the observed effects are directly connected with the application of the very high cooling rates and with the segregation of excess vacancies at thermal antiphase boundaries. 2. The ‘two-phase’ nature of coalescence of the antiphase boundaries in annealing.

Melt-quenched nanocrystals (type I nanocrystals) 29 and DO 3 , formed in different temperature–concentration ranges. All the alloys of the Fe 3Si–Fe 3Al system (Fig. 2) show at room temperature the ordering effects in accordance with the type DO 3. Using the results of high-temperature x-ray diffraction investigations carried out in [24], it was shown that in cooling of the alloys from the region of the disordered BCC solid solution A2, the process of ordering of the DO 3 type is preceded by the formation of the B2 superstructure.

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