Abstract
Ti-Ta alloys are choice materials for bio-medical applications, but obtaining tailormade material properties through using spark plasma sintering (SPS) fabrication exhibits potential challenges. The effects of sintering temperature, pressure and holding time on the microstructural, crystallographic, mechanical and corrosion behaviour of spark plasma sintered Ti-30Ta alloys were investigated. Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Spectroscopy (EDS), X-Ray Diffractometry, microhardness and instrumented nanoindentation were used for the investigation. Microstructures obtained include martensite plates (alpha-Ti phases), beta-Ti phases, as well as significant volume of beta-Ta phases. Notable variation in crystal structure, mechanical properties and electrochemical behaviour were recorded. Generally, the materials exhibited high densification (>98%), improved micro-and nano-indentation hardness (>500 Hv), and elastic moduli (>40 GPa). Average Oxygen content of the sintered samples was 0.0106%. The measured properties of the sintered Ti-30Ta alloys suggest they can be efficient for applications in biomedical technologies.
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