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By A M Glezer; I E Permi︠a︡kova

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Example text

In the second case, the DO3 superstructure may form also directly from the disordered state. In the A2→DO 3 transition four types of domains should form simultaneously in the initial matrix and, correspondingly, the so-called foam structure, predicted by Bragg as early as in the 30s, also forms [28]. It is important to note that in this case the effective size of the domains, restricted by the APB of the type a/2〈111〉, should be comparable with that for the regions limited by the APB of the type a〈100〉 [28].

The correlation between the dependence of the values of H and ρ l on the annealing temperature on the one side, and the values D cr and d e, on the other side, is clearly visible. The maximum hardness is obtained at the same annealing temperature as the temperature resulting in the maximum bulk density of the dislocation loops (300°C), and the minimum critical bending diameter (maximum plasticity) is obtained at the same annealing temperature as the annealing temperature resulting in the minimum effective grain size.

In Fig. 5b (reflection 222) the conventional diffraction contrast from APB does not form. The thermal APBs do not show any tendency to the distribution in specific crystallographic planes and do not form the anomalous diffraction contrast under the effect of the main reflections. The special features of the domain structures also remain after annealing of the quenched alloy in the entire temperature range. Examination of the electron microscopic contrast from the APB showed an important relationship – the effect of the reflection 222 (and, generally, of any superstructural reflection with even indexes) results in the formation of a slight contrast from the APBs which form the ‘normal’ diffraction contrast under the effect of superstructural reflections with the odd indexes (in the reflection 111 in Fig.

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