Subgrain growth in Al and Al-1% Mn during annealing

Deformation and strengthening mechanisms of a carbon nanotube reinforced aluminum composite

“…Earlier studies by Sandstrom et al [72] introduced subgrain coalescence as the subgrain growth and the disappearance of sub-boundaries which lead to the decrease of the stored energy and the change of orientations between coalesced and neighboring subgrains. This promotes the formation of HAGBs having the ability to migrate fast and to form the recrystallization nucleus [73].…”

Nucleation and growth during recrystallization

“…The moving sub-boundary absorbs dislocations, increasing its orientation difference, its energy and mobility until it is transformed into a high angle boundary, hence characterizing nucleation. Sandström and collaborators 60 observed the subgrain growth in pure aluminum at temperatures of 300 to 400 °C (0.6 and 0.7 T m , respectively, were T m is the absolute melting point), showing that this was the operative mechanism at higher temperatures. Varma and Willits 61 observed essentially the same.…”

“…Still quoting the systematic study of Sandströn and co-authors 60 , subgrain coalescence has been observed in aluminum using transmission electron microscopy, for temperatures of 0.4 and 0.5 T m . Therefore, experimental evidences suggest that subgrain coalescence, when compared to subgrain migration, is favored for lower annealing temperatures.…”

Modeling of Subgrain Growth Kinetics: 3D Monte-Carlo Simulation

“…In some cases the value of the exponent n in equation 1 is found to be 2, which is similar to that for ordinary grain growth following recrystallization [2,3,4,5]. More recent experimental studies, however, give a larger n, such as n = 2.5-7 [6,7]; the larger n means that the growth rate decreases more rapidly over time.…”