Recrystallization behaviour of Al-2Li-3Mg-1Cu-0.12Zr-X Mn(X = 0, 0.5) alloy

Abstract

Grain size control by thermo-mechanical treatment is investigated in aluminum-lithium alloys. Rolling and subsequent recrystallizing treatment have been widely employed to obtain a fine grained structure. Humphreys has reviewed the recrystallization process in particle containing alloys and proposed a new deformation zone model. He thought that subgrain size or dislocation density increased abruptly beyond the deformation and boundary. He considered that a recrystallization nucleus formed and grew fast within the deformation zone. For nucleation of new grains, the maximum misorientation within the deformation zone should be sufficient to form a high angle boundary in the matrix, and for continuous growth of the nucleus, the deformation zone should be larger than critical size R{sub cr}. In this work, the recrystallization behaviors of Mn-free and Mn-bearing Al-Li alloys at various recrystallization temperatures were investigated to confirm the deformation zone model proposed by Humphreys.