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

Аннотация

The results of studying the influence of fabrication modes of 1.5-, 2.0-, and 3.0-mm-thick sheets 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 3.0-mm-thick sheets have a partially recrystallized structure, 2.0-mm-thick ones have unrecrystallized structure, and 1.5-mm-thick ones have a mainly recrystallized structure. The preferential crystallographic orientation of the 1.5-mm-thick samples is [110](200), that of 2.0-mm-thick samples is [110](110), and that of 3.0-mm-thick samples 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 formability in the course of drawing and stretching.