STUDY OF MICRO STRUCTURE AND MECHANICAL PROPERTIES OF MAGNESIUM TITANIUM COPPER ALLOY USING SPARK PLASMA SINTERING METHOD

• Main Author: Luthfi, Ahmad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/75217
• Institution: Institut Teknologi Bandung

There has been ongoing research on biomaterials from Ti-Cu alloys which are superior in terms of biocompatible, corrosion resistance and good anti-bacterial properties. The author proposes adding the element Magnesium to the Ti-Cu alloy to reduce the specific gravity and Young's modulus without reducing its other mechanical properties. This aims to eliminate the effect of stress shielding on the bone and muscle tissue around the implant. In addition, by making the structure of this alloy porous using powder metallurgy and sintered with Spark Plasma Sintering (SPS). This sinter aims to alloy metals under high pressure as well as a vacuum to reduce the possibility of forming interstitials on metals such as oxides. This process was preceded by mechanical alloying, using a shaker mill for 2 hours to make it homogeneous. Then sintered with SPS using a melting temperature between 600-700 ?. The pressure achieved is 50 MPa and a vacuum of 5 Pa. This method was applied to the nine samples with variations of 1.3.5 %w Cu and 1.3.5%w Magnesium with Titanium as the matrix. Then analyze the physical properties, among others; XRD, Optical Microscope, SEM EDS, porosity, grain size, compressive strength, hardness, toughness and Young's modulus. The result of this method is that the optimal conditions for the alloy closest to the Young's modulus value of the anterior tibia bone 35 GPa are Ti1Cu1Mg alloys. This alloy has physical properties including; compressive strength 1410 MPa, hardness 427 HV. For the microstructure it has; grain size of 6.24 ?m, observed intermetallic OM and SEM EDS Ti2Cu 3% and matrix Ti?+Ti? in XRD data. For the analysis of the stress-strain curve, the yield strength is 1207 MPa, Young's modulus is 33 GPa and toughness is 158 MPa.