Publication: Phase and deformation behaviour of titanium alloys with nb and mo stabilizer elements
Loading...
Date
2024-08-01
Authors
Khairun Azwani Binti Tahir
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Titanium alloys, which have excellent biocompatibility, corrosion resistance, and mechanical qualities, are frequently employed in biomedical and aeronautical applications. Alloying with β-phase stabilisers, such as niobium (Nb) and molybdenum (Mo), is essential for producing advanced materials. This study aimed to create titanium alloys with high β-phase content through metal injection moulding (MIM) and evaluate the impact of Nb and Mo, as well as iron (Fe) addition, on their microstructure and mechanical properties. The research used MIM with elemental mixtures to create titanium alloys. Metal powder preparation involves mixing Ti-Nb, Ti-Mo, and Ti-Mo-Fe powders using a centrifugal mixer. A polymer binder is added, mixed, and injection moulded to form the "green part." The green part undergoes solvent debinding and thermal debinding, then sintered at 1100°C for 2 hours. The sintered parts undergo tests like microstructure observation, XRD analysis, density and porosity measurements, compressive tests, and hardness tests. Based on the XRD analysis, adding Nb and Mo effectively stabilized the β phase, with Ti-20Nb and Ti-15Mo alloys achieving β-phase contents of 70% and 72%, respectively. The inclusion of Fe in Ti-Mo alloys further enhanced β-phase stability, resulting in a Young's modulus of approximately 25 GPa, hardness of 291 HV, and compressive strength of 788 MPa. The research found that adding Nb and Mo to high β-phase titanium alloys improves their mechanical properties and phase stability, highlighting the efficiency of the MIM technique in advanced materials.