Microstructures and Mechanical Study of Mg Alloy Foam Based on Mg-Zn-Ca-CaCO3 System

Magnesium alloy, a material that has the potential to use some applications such as aerospace components, computer parts and mobile phones. Magnesium alloys can also be a popular candidate as orthopedic implant material for biodegradability, non-toxicity, and mechanical and physical properties are excellent. Magnesium, as one of the main macro elements required for the proper functioning of the human organism is used to test the materials for biodegradable implants. The main objective of this study was to find out the microstructure and mechanical characteristics of the Mg-Ca-Zn-CaCO3 alloy as porous implant materials are biodegradable. The presence of CaCO3 on the alloy to function as a foaming agent that is expected to produce gas bubbles during manufacturing process takes place that will form pores in the alloy. Mg-Ca-Zn-CaCO3 alloy made by powder metallurgy method with three variations of composition (96Mg-Ca-3Zn-CaCO3, 91Mg-Ca-3Zn-5CaCO3, 86Mg-Ca-3Zn-10CaCO3 wt persen). Milling process using a shaker mill for 2 hours to produce a powder size distribution is more homogeneous. The mixed powder were unaxially pressed at pressure 100 MPa for 2 minutes and 200 MPa for 3 minutes into green compacts with dimensions of 10 mm in diameter and 10mm in length. Sintering process is carried out at 650°C with a variation of holding time 10 and 15 hours and than the specimens were cooled down to room temperature. Microstructural analysis was performed using X-Ray diffraction technique (Shimadzu XRD-7000) and and Scanning electron microscopy (JEOL, JSM-6390A Japan) equipped with an energy disperse spectrometry (EDS) attachment, while the mechanical characteristics were analyzed using compression testing using Universal Testing Machine (Shimadzu AGS-10 KN) with dimensions Ø10mm x 10 mm at room temperature and rate 1,33mm/min, density (Using Archimedes method) and porosity. The results show that the optimum microstructure and mechanical characteristics is the holding time of 10 hours. Value of compression 208.398 N/mm2, density of 1.63 g/cc and a porosity of 18 persen on the composition of 86Mg-Ca-3Zn-10CaCO3 wt persen. The International Conference on Advanced Materials Science and Technology 2016