In general, continuous dynamic recrystallization forms high angle grain boundaries for fully recrystallized grains in a severe plastic deformation process (e.g. friction stir processing) of aluminium alloy.
Dear Akash Mukhopadhyay,
It will be helpful if you are more specific about your query. Are you trying to make a conclusion on the underlying mechanism (DDRX or CDRX) based on the observed microstructure?
In any case, the increase in high angle grain boundary fraction implies several phenomena; one of them could be DRX. HAGB alone can not conclusively prove it. You need to consider grain size factor, GOS distribution in conjunction with evolution of boundary fraction. In case of CDRX, it is often useful to follow the evolution path as a function of strain.
Dear Akash,
considering the process of FSW, a totally new micro structure ist created.
So, the number of high-angle grain boundaries will be different from the base material anyway.
In Conclusion, fully recrystallised grains cannot be detected looking at the amount of high angle grain boundaries but by the dislocation density inside the grains (see definitions of "re-crystallisation" in textbooks of Metal Physics).
Best regards - Torsten
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