Effect of storage on the stability of the grained structure and phase transformations in the nanocrystalline alloy 1450 doped with Sc and Mg

The effect of long-term storage on the structural and phase transformations in the alloy 1450 doped with Sc and Mg additions based on the Al-Li-Cu-Zr system has been investigated after severe plastic deformation by torsion under pressure and subsequent low-temperature annealing using electron microscopy and X-ray diffraction analysis. It has been found that in the strongly deformed alloy, upon storage, there simultaneously occur a recrystallization accompanied by a transformation of the alloy structural constituents and a decomposition of the supersaturated solid solution. Annealing of the deformed alloy yields a stable nanocrystalline structure.