Elastic properties of the titanium alloy Ti-6Al-4V

The manuscript presents the results of the measurements of Young's modulus (E) for the two-phase titanium alloy Ti-6Al-4V. The estimation of E was made using two independent methods: standard mechanical tests (tensile test) on an Instron electronic dynamometer and the method of nanoindentation using a Nanoscan3D nanohardness-testing scanning machine. The elastic properties were studied for different structural states of the titanium alloy Ti-6Al-4V: nanostructured (NS), microcrystalline (MC) and coarse-grained (CG). The elastic moduli for alpha-and beta-phases were measured by means of the nanoindentation method. It is shown that the value of E for the Ti-6Al-4V alloy in the CG state is smaller than in the NS state by more than 20 %, which is likely to be attributed to a change in the amount ratio between alpha-and beta-phases characterized by different elastic properties.