Recovery and recrystallization of aluminium bronze during hot deformation

Abstract

The effects of temperature, strain rate, chemical composition, and annealing time on the phenomena occurring during the deformation of BA1032 aluminium bronze have been investigated. For this purpose the authors applied an indirect method by analysing the change in the flow stress as the function of the deformation, as well as by direct observation of the structures. It was found that a relation exists between the type of structure of aluminium bronze occurring during the hot deformation and the work-softening processes of the distorted structure. If, during hot deformation, the bronze contains only the β + k phases or, additionally, an insignificant amount of α-phase, then it easily undergoes dynamic recovery, in consequence of which a banded structure with anisotropic mechanical properties of the bronze is obtained. However, if the bronze has a three-phase structure, α + β + k, with a distinct amount of α-phase, then, after reaching the critical deformations, it undergoes the recrystallization process, which is responsible for the equiaxial grain structure with negligible anisotropic mechanical properties.