Boundary migration during recrystallization was followed by an ex situ electron channelling contrast technique, and protrusions/retrusions formed locally on recrystallization boundaries were quantified. The results showed that the motion of recrystallization boundaries was much more complex than generally appreciated. Locally protrusions/retrusions could provide a driving force comparable in magnitude to the driving force from the stored energy in the deformed matrix. The stop–go motion of the recrystallization boundaries was also considered, and related to the formation of protrusions and retrusions.

Local Boundary Migration during Recrystallization in Pure Aluminium. Y.Zhang, A.Godfrey, D.J.Jensen: Scripta Materialia, 2011, 64[4], 331-4