EFFECT OF HEAT TREATMENT ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF TITANIUM - 5WT% COPPER FABRICATED USING SPARK PLASMA SINTERING

• Main Author: Rayhansah, Muhamad
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/72477
• Institution: Institut Teknologi Bandung

Ti-Cu alloy is one of the biomaterials that can be used as bone implants. The advantages of Ti-Cu alloy are having good biocompatibility and corrosion resistance, anti-bacterial properties, high strength, and low modulus of elasticity. The spark plasma sintering (SPS) method can be used to adsorb Ti-Cu alloys with low pore counts. Heat treatment of conventional powder metallurgical products has been commonly carried out, but the heat treatment of spark plasma sintering results is still a lack of research. Providing heat treatment to the sintered Ti-5Cu product with spark plasma sintering (SPS) is an attempt to study the effect of heat treatment on the microstructure and mechanical properties of the Ti-5Cu alloy. Heat treatment annealing was carried out at a temperature of 790°C held for 1 hour, solution treatment was carried out at 805°C held for 1 hour followed by rapid cooling, and aging was carried out at a temperature of 400°C and 475°C with a holding time of 24 hours and 8 hours sequentially. The results of each heat treatment will be analysed for its microstructure using an Optical Microscope (OM) and Scanning Electron Microscope – Energy Dispersive Spectroscopy (SEM-EDS). While the mechanical properties analysed were compressive strength through a compressive test and alloy hardness through a micro hardness test. The results of heat treatment on Ti-5Cu gave effect to the microstructure and mechanical properties of the alloy. The results of the annealing heat treatment showed that the microstructure of the Ti2Cu precipitate was spherical and fairly evenly distributed in the grain boundaries of the -Ti matrix. The results of the mechanical properties of the annealing did not provide a significant increase from as-received. Heat treatment solution treatment only without continued aging provides a microstructure without the presence of Ti2Cu precipitates. The mechanical properties of the solution treatment alone were the lowest compared to all the heat treatments applied. Aging of the Ti-5Cu alloy from SPS showed that the Ti2Cu precipitate grew uniformly and elongated at the grain boundaries of the -Ti matrix. The mechanical properties of Ti-5Cu after being given aging treatment for 24 hours and 8 hours gave a significant increase compared to before being given heat treatment with ultimate compressive strength of 1801 MPa and hardness of 562.8 HV.