A geometric framework for mesoscale models of recrystallization

作者：Thomas J P^*; Montheillet F; Semiatin S L

来源：Metallurgical and Materials Transactions A-Physical Metallurgy and Materials Science, 2007, 38A(9): 2095-2109.

DOI：10.1007/s11661-007-9247-x

Geometric aspects are a major issue in models of recrystallization that rely on statistical grain-population descriptions, because the growth of recrystallized grains has to be compensated by the loss of volume of deformed grains, thus leading to concomitant variations in all geometric variables. A geometric framework for such models was thus designed. It is based on mesostructure units (MSUs), each of which represents an aggregate of similar grains. The evolution of MSUs is controlled by two kinds of inputs, nucleation rates and grain-boundary velocities, from which the evolution of microstructure is described in an internally consistent fashion. The geometric framework was applied initially to the necklace recrystallization of fine-grain microstructures, viz., the usual form of recrystallization comprising nucleation on initial grain boundaries. It was extended to describe particle-stimulated nucleation (PSN) in order to treat geometric effects related to intragranular recrystallization, as is found in coarse ingot microstructures. For both the necklace-only and necklace-and-PSN cases, test cases using simple inputs were performed to validate the behavior of the geometric framework.

• 出版日期2007-9