The influence of fabrication modes of sheets of V-1461 alloy on the structure crystallography and anisotropy of properties

Abstract

The results of studying the influence of manufacturing modes of sheets 1,5, 2,0 and 3,0 mm thick made of V-1461 Al–Li alloy on the microstructure, crystallographic orientation, and anisotropy of properties are presented. It is established that the deformed structure is characteristic of all studied samples, and sheets 3.0 mm thick have partially recrystallized structure, those 2,0 mm thick have unrecrystallized structure, and those 1,5 mm thick have mainly recrystallized structure. The preferential crystallographic orientation of the samples 1,5 mm thick is [110](200), that of samples 2,0 mm thick is [110](110), and that of 3,0 mm thick is [210](110). All the sheets possess insignificant anisotropy of properties irrespective of thickness, and extremely low anisotropy index (μ < 0,4) is characteristic of them. These facts determine the liability of aluminum–lithium alloys to the preferential development of deformation over the sheet thickness, which leads to its premature thinning and lowers admissible forming in the course of drawing and stretching.