STUDY ON MECHANICAL PROPERTIES AND CORROSION RESISTANCE MG-ZN-FE-CU-CO AS HIGH ENTROPY ALLOYS FOR IMPLANT BIODEGRADABLE APPLICATION

• Main Author: MULYA ASHARI, ANDI
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/54686
• Institution: Institut Teknologi Bandung

Magnesium and its alloys are promising candidates for degradable materials with good biocompatibility. Magnesium has limitations such as low in mechanical properties and high corrosion rates. Therefore, several integration methods were developed, such as the high entropy alloy (HEA) method. Mg-Zn-Fe-Cu-Co alloys were designed by using the method of equiatomic ratio and high entropy of mixing. Hence, this paper studies the microstructure, mechanical properties, and corrosion resistance of high entropy Mg-Zn-Fe-Cu-Co alloy. Pure Magnesium (60 ?m), Zinc (45 ?m), Fe (10 ?m), Cu (63 ?m), and Co (1 ?m) powder were mixed and milled using a shaker mill at 700 rpm for 1800s. Tthe resulting milled powders were compacted and sintered at 300 MPa for 180s continue to 600 MPa for 120s and 700oC with 2 hours soaking time in a tube furnace at 5 °C/min with a high purity argon atmosphere. Microstructural, phase and mechanical properties analyses were performed following the standard of testing and measurement. The physical and mechanical properties of Mg-Zn-Fe-Cu-Co were influenced by the magnesium content in the alloys. Mg-Zn-Fe-Cu-Co alloys have a medium hardness (286.06 HV - 80.98 HV). The densities of alloys were moderate (3.057 g.cm-3 to 1.71 g.cm-3). The coumarin inhibitor in hanks' solution was very effective with a high inhibitor efficiency up to 10% in reducing the corrosion rate of the Mg-Zn-Fe-Cu-Co alloy. Small holes and micro-cracks are present due to galvanic micro-corrosion between the intermetallic phase and the matrix. This study concludes that high entropy is a promising method for processing Mg elements. The 20Mg-20Zn-20Fe-20Cu-20Co alloy has ideal mechanical properties and corrosion resistance meets the minimum requirements of high entropy alloys and is considered a potential candidate for ureteral implant applications.