STUDY ON THE EFFECT OF HEATING RATE AND COMPACTION PRESSURE ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TI-5CU-5MN ALLOY FROM SPARK PLASMA SINTERING

• Main Author: Lambert Surodibroto, Ruben
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/86373
• Institution: Institut Teknologi Bandung

The SPS method is a powder metallurgy technology to make solids with high density and fine grain size from their constituent powders. Ti-Cu-Mn alloy began to be researched in this decade due to its biocompatible properties, high strength, good corrosion resistance, and modulus of elasticity that is close enough to human bone so that it becomes a suitable biomaterial for bone implant applications. The addition of copper to titanium alloys can add antibacterial properties. The requirement for titanium powder can be reduced and the strength of the alloy is increased by the addition of manganese to the alloy. Manganese as a phase ? stabilizer can reduce the modulus of elasticity so that it can reduce the effect of stress shielding by implants. In this study, spark plasma sintering was carried out to produce Ti-5Cu-5Mn alloy. The variables in this experiment are the heating rate of 25, 50, and 100 °C/min, as well as the compaction pressure of 40, 50, and 60 MPa. Ti-5Cu-5Mn powder is first mixed by mechanical alloying for 6 hours. Then the sintering process is carried out at a temperature of 750 °C without isothermal detention in vacuum conditions. The resulting samples were then prepared for relative density test, XRD test, observation of microstructure with optical microscope, SEM-EDS analysis, compressive strength test, and vickers hardness test. Based on the results, it is known that the relative density of the Ti-5Cu-5Mn alloy resulting from SPS will increase with a lower heating rate and higher compaction pressure. The maximum relative density was obtained at compaction pressure of 60 MPa with a value of 97.44%. Observation of the microstructure shows the phases that are formed, namely ?-Ti as the matrix and Ti2Cu, TiCu, and TiCu4 as intermetallic compounds with finer grain sizes at higher heating rates and lower compaction pressures. The hardness of the alloy will increase as the heating rate and compaction pressure increase with a maximum hardness of 494.2 HV at a compressive load of 60 MPa. The smallest grain size was obtained at a heating rate of 100 °C/min with a grain diameter of 15.5 ?m. The compressive strength increases with the increase in the heating rate and compaction pressure but decreases at a heating rate of 100 °C/min and a compaction pressure of 60 MPa. The maximum compressive strength is obtained at a heating rate of 50 °C/min and a compaction pressure of 50 MPa with a value of 2195.12 MPa.