Abstract
During deformation, the original grains change their shape and the surface area per unit volume increases with strain until a certain critical strain has been reached. The structure of high-angle boundaries has been monitored at increasing strains with the aim of finding the effect of grain breakup and strain-induced boundary migration. It has been found that the distance between the high-angle boundaries does not depend only on geometrical considerations. At high Zener-Hollomon parameters, the distance between the high-angle boundaries was found to be smaller than predicted from geometry, indicating that high-angle boundaries are formed during deformation. In the case of deformation at very low Zener-Hollomon parameters, the distance between the high-angle boundaries was found to be larger than predicted from geometry, which indicates migration of the original grain boundaries in a direction opposite to the one imposed by the deformation. The evolution in grain-boundary structure during deformation has been successfully modeled on the basis of expressions for the grain breakup and restoration reactions.
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Pettersen, T., Holmedal, B. & Nes, E. Microstructure development during hot deformation of aluminum to large strains. Metall Mater Trans A 34, 2737–2744 (2003). https://doi.org/10.1007/s11661-003-0175-0
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DOI: https://doi.org/10.1007/s11661-003-0175-0