EUROPEAN CONGRESS AND EXHIBITION ON ADVANCED MATERIALS AND PROCESSES - EUROMAT 2021

The present study investigates the influence of thermomechanical (TM) processing conditions on microstructure and mechanical properties of new beta-Titanium alloy (belonging to Ti-Nb-Ta-Zr system), by SEM-EBSD (Scanning Electron Microscopy - Electron Backscatter Diffraction), XRD (X-ray Diffraction), tensile and microhardness testing techniques. The beta-Titanium alloy was produced in cold-crucible levitation melting starting from high-purity constituent elements. The TM processing route consists of cold rolling (CR) deformation, with a total thickness reduction (total deformation degree) close to 50%, in successive 10% steps, followed by a solution treatment (ST), applied in order to remove unwanted effects introduced by the CR (strain-hardening, increased dislocation density, developed slip/twins, etc.). The ST was performed at a treatment temperature of 850°C, in argon protective atmosphere. Different ST treatment durations were used, from 5min to 20min, in 5min incremental steps.
Microstructural characteristics (constituent phases, phase morphology, grain-size, grain distributions) and obtained mechanical properties (ultimate tensile strength, yield strength, elongation to fracture, elastic modulus, and microhardness) of all TM processed samples were analysed and correlated with the TM processing conditions.
Acknowledgements: This work was supported by a grant of the Romanian Ministry of Education and Research, CCCDI - UEFISCDI, project number PN-III-P4-2.1-ID-PCE-2020-1934, contract PCE213/2021, within PNCDI III.