Abstract
The effect of the dependence of grain boundary mobility on misorientation angle and that of structure of the matrix on the growth selectivity during primary and secondary recrystallization are discussed. It was found that the longer is the distance travelled by the growing grain boundaries and the wider the range of the misorientation angles between the new grains and the matrix, the less is the difference between the grain boundary mobilities of the growing grains, necessary for the manifestation of growth selectivity. So during secondary recrystallization the latter is more manifest. In primary recrystallization after moderate deformations, the growth selectivity will be the least obvious when the deformed matrix consists of small differently oriented areas at whose borders new grains nucleate simultaneously. The secondary grain boundaries should be characterized by “effective” mobility, which depends on the number of the adjacent grains and their dimensions, as well as on the growing grain misorientation in relation to these grains. In the small grained material without a texture, the effective boundary mobilities of any grains are equal, and so the growth selectivity in such a material is non-existing.
Highlights
The effect of the dependence of grain boundary mobility on misorientation angle and that of structure of the matrix on the growth selectivity during primary and secondary recrystallization are discussed
Our aim is to give a thorough examination of the specific structural features affecting growth selectivity, the texture development, during the course of primary and secondary recrystallization
As deformed matrix areas of different orientations vary in strain energy the primary grains consuming the areas .may grow at different rates
Summary
The effect of the dependence of grain boundary mobility on misorientation angle and that of structure of the matrix on the growth selectivity during primary and secondary recrystallization are discussed. A great number of experimental date demonstrate the validity of oriented nucleation and selective growth theory, some authors still believe that during recrystallization the texture develops either by oriented nucleation or by selective growth This can be explained by experimental conditions (purity, structure and texture of the studied samples, mode and degree of cold deformation, the way of nucleation of new grains or the initiation of growth of existing grains, and the recrystallization anneal conditions) under which one of the aspects of the texture formation mechanism is manifest. The grain boundary mobility depends on the angle and axis of misorientation, as well as on the boundary type
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