STUDY ON MECHANICAL PROPERTIES AND CORROSION RESISTANCE OF TI-CU-NI-MN-ZN AS HIGH ENTROPY ALLOYS AND BETA TITANIUM IN SODIUM CHLORIDE, SULFAMIC ACID, AND MUREXIDE SOLUTION

• Main Author: Azhar Ariefkha Dani, Muhammad
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/66280
• Institution: Institut Teknologi Bandung

Titanium and its alloys are attractive materials for structural applications with high strength properties and good corrosion resistance. However, titanium has the disadvantage of high raw material and processing costs. Therefore, to overcome the high cost of titanium, several alloying methods have been developed, one of method is the high-entropy alloy method. To our knowledge, there have not been many studies on high entropy alloys using titanium and no studies on Ti-Cu-Ni-Mn-Zn alloys have been found. This research study the microstructure, mechanical properties, and corrosion resistance of the Ti-Cu-Ni-Mn-Zn alloy. Alloys Ti20Cu20Ni20Mn20Zn and Ti13Cu9Ni5Mn5Zn alloys were synthesized by powder metallurgy technique. Titanium, copper, nickel, manganese, and zinc powders were mixed with a mortar for 5 minutes. The results of the mixing process were compacted with a pressure of 500 MPa for 30 seconds at room temperature. Then, sintered at 880ºC for 3 hours in a high-purity argon atmosphere. The physical, mechanical, and corrosion resistance properties of Ti-Cu-Ni-Mn-Zn alloys are affected by phase form in the alloy. In the experimental results, the alloy Ti20Cu20Ni20Mn20Zn as a high entropy alloy has a low hardness value of 190.658 HV and a high corrosion rate of 12.328 mm/year. The alloy Ti13Cu9Ni5Mn5Zn as a beta titanium alloy has a high hardness value of 430.736 HV and a low corrosion rate of 0.189 mm/year. The experimental results show that Ti13Cu9Ni5Mn5Zn alloy has better corrosion resistance and hardness compared to Ti20Cu20Ni20Mn20Zn, so it is considered an attractive candidate for seawater structural applications and the chemical industry.