By A M Glezer; I E Permi︠a︡kova
ISBN-10: 1466594152
ISBN-13: 9781466594159
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Extra info for Melt-quenched nanocrystals
Example text
The examination of the prismatic loops in the sections of the matrix showing no signs of dislocation sliding, with no preferential distribution of the dislocation loops in a specific crystal plane, confirms that the agglomeration mechanisms dominate in the process of rapid quenching from the melt. Evidently, the effect of these mechanisms is caused by the high rate of formation of the vacancy clusters in the alloys with a large dimensional mismatch in the conditions of melt quenching. The presence of helicoidal dislocations with different degrees of perfection and the stroke configuration of the rows of prismatic loops indicate the possible operation of the mechanisms 2 and 3.
The ‘two-phase’ nature of coalescence of the antiphase boundaries in annealing. In the process of coalescence of domains two ‘phases’ appear to coexist within the limits of the same grain: the sections of the initial structure with small domains and the sections of the structure with large domains. The ‘phase’ with the large domains grows at the expense of the other ‘phase’ with the increase of the annealing time from the boundaries. 3. The elongated form of the antiphase boundaries. In the alloys with a not too high Kurnakov point, the structure of the antiphase boundaries is often elongated and not equiaxed.
This increases the excess concentration of vacancies at the grain boundaries where quenching dislocations additionally arrive from the previously solidified regions. An efficient method of the 42 Melt-quenched nanocrystals relaxation of quenched dislocations is ‘closure’ of the dislocations in prismatic dislocation loops. It is also possible that the ‘sticking up’ of dislocations, shown in Fig. 12d, also act as effective vacancy sinks from the moving crystallisation front and grow as a result of settling of excess vacancies on them.
Melt-quenched nanocrystals by A M Glezer; I E Permi︠a︡kova
by James
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