Subgrain coarsen shares many features with grain growth.
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Subgrain rotation is also known as in-situ recrystallization without considerable grain growth.
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Sub-grain formation is followed by subgrain coarsening where the average size increases while the number of subgrains decreases.
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The process is called subgrain rotation ( SGR ) and can eventually lead to the formation of new grains when the dislocation wall becomes a new grain boundary.
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Wu " et al . " describe a process in which dislocation motion becomes restricted due to the small subgrain size and grain rotation becomes more energetically favorable.
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Optical microscope and transmission electron microscope ( TEM ) are usually utilized in observing the sequential occurrence of subgrain rotation and local grain boundary bulging, and measuring recrystallized grain size.
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Where ? is the dislocation density, G is the shear modulus, b is the Burgers vector of the dislocations, ? is the sub-grain boundary energy and d s is the subgrain size.
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Because of a contrasting assumption that subgrain rotation nucleation in continuous DRX ( CDRX ) should be considered for the nucleation rate, Shimizu has come up with another model, which has also been tested in laboratory:
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The bulges produced can separate from the original grain to form new grains by the formation of subgrain ( low-angle ) boundaries, which can evolve into grain boundaries, or by migration of the grain boundary.
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Rotation recrystallization ( subgrain rotation ) is the progressive misorientation of a subgrain as more dislocations move into the dislocation wall ( a zone of dislocations resulting from climb, cross-slip, and glide ), which increases the crystallographic mismatch across the boundary.
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