Omega phase formation and deformation mechanism in heat treated Ti-5553 alloy under high strain rate compression

Abstract This research has been carried out to focus on the formation of omega phase and deformation mechanism in Ti-5553 heat treated (900 °C for 1-h solid solution without aging) at high strain rate compression. Split Hopkinson Pressure Bar (SHPB) was used to apply load at room temperature and the effect was characterized with the help of analyzing tools. Results ended up with the conclusions that under high strain rate loading, omega phase formation arose when two adjacent beta planes (1 1 0)ᵦ in 〈1 1 1〉ᵦ direction covered 1/6th distance of total separating distance between planes and deformation through mechanical twinning occurred when dislocations could not match superimposed strain rate.