Study of mechanical properties and corrosive resistance of ultrafine-grained alpha-titanium alloy Ti-5Al-2V

摘要

The research has been conducted into the impact that structural-phase state of grain boundaries in alpha-titanium alloy Ti-5Al-2V has on strength, plasticity and susceptibility to intercrystalline corrosion (ICC). It is found that during Equal Channel Angular Pressing (ECAP) performed at elevated temperatures there is a change in local concentration of alloying elements (aluminum, vanadium) along alpha-Ti grain boundaries. The current study proves that by controlling the structure of a-titanium alloy Ti-5Al-2V through ECAP it is possible to enhance its strength and resistance to hot salt intercrystalline corrosion. Plasticity of ultrafine-grained (UFG) alloy samples at room temperature is comparable with plasticity of a coarse-grained material, while plasticity of an UFG alloy at elevated temperatures is 2-3 times bigger than plasticity of a coarse-grained material. (C) 2017 Elsevier B.V. All rights reserved.