Article,
On the activation of recrystallization nucleation sites in Cu and Fe
Materials Science and Engineering: A, 502 (1-2): 70--78 (2009)
DOI: DOI: 10.1016/j.msea.2008.10.015
Abstract
Rapid thermal heat treatments were used to investigate the early stages
of recrystallization in pure iron and copper. The nucleation events
for the recrystallization process were observed to take place in
the vicinity of triple junctions, grain boundaries and grain interiors.
Electron Back-scatter Diffraction (EBSD) was used to measure both
the frequency of nucleation events and the misorientation gradients
present at each of the above sites. The potency of the nucleation
sites was found to increase with the local misorientation gradient.
A simple physically based model was developed to predict the incubation
time for the formation of recrystallization embryos in the vicinity
of each site. This model can be coupled to existing recrystallization
and growth models to produce a more complete description of the recrystallization
processes including the competition between nucleation sites.
