Structure and properties of a metastable β-alloy aged after plastic deformation

Phase and structural transformations in a multicomponent (5.05 mas.% Mo-4.95V-3.00Cr-3.05Al) metastable β-titanium alloy on aging after plastic deformation are studied using methods of electron microscopy and X-ray diffraction analysis. The alloy is deformed by twinning in a {332} <113-bar> system, and even at initial stages the formation of a twin skeleton takes place in the structure, on further loading the deformation of the skeleton is by secondary twinning resulting in a high plasticity of the alloy. On annealing mechanical twins transform into α-phase - a ductile twin skeleton is replaced by a rigid skeleton of α-phase plates. The aging enhances the yield strength of the alloy but decreases sharply its plasticity