Phase transformations and structural changes in the course of the high-temperature superplastic deformation of aluminum alloys

Abstract

Phase and structural transformations, which develop under conditions characteristic of high-temperature superplasticity in matrix multicomponent aluminum alloys, have been investigated. It has been shown that the appearance of a metastable liquid phase is in principle possible in the structure of such alloys in the process of the establishment of the equilibrium state during their heating to the temperature of tests and in the course of superplastic deformation. The characteristic properties of the structural changes that occur in the course of the superplastic deformation of such alloys have been studied. The basic conditions that lead to the origin and the development of fibrous species in the course of the high-temperature superplastic deformation have been determined. The determining role of magnesium in the process of origin and development of such fibrous formations is shown.