Influence of Solution Treatment Cooling Medium on Microstructure And Elastic Modulus Ti-6AI-6Mo For Biomedic Applications

摘要

Titanium Ti-6A1-4V is widely used as a biomaterial because it has a low elastic modulus. Vanadium is known as a toxic element and caused allergic in the human body. Therefore in recent study vanadium substitute by Molybdenum in the Ti alloys, the composition of alloys consists of 6 % Alumunium, 6 % of Molybdenumand 82 % of Titanium in weight percent (Ti-6Al-6Mo). The elastic modulus and the microstructure were studied based on the effect of solution treatment cooling medium. The Ti-6Al-6Mo as-cast was homogenized at a temperature 1150°C for 12 hours then hot-rolled with preheating temperature of 1050 °C for 30 minutes, and 50% of reduction. Solution Treatment held at 1150 °Cfor 3 hours and cooled with oil, water, and ice water. The micro structures were observed using optical microscope and SEM-EDX, the phase transformations were observed using XRD and the elastic modulus was observed using an ultrasonic test approach. The result of optical microscope shows that the structure of Ti-6Al-6Mo is on an equiaxed form in the various cooling medium. The XRD shows that Ti-6Al-6Mo has α and β phase, and the ultrasonic test informs that water gives the lowest modulus, 107.4 GPa.