Studies on the Mechanical Properties and Wear Behavior of an AZ91D Magnesium Metal Matrix Composite Utilizing the Stir Casting Method

This work investigates the mechanical and tribological properties of hybrid composites constructed from RE oxides and an AZ91D magnesium matrix. In order to achieve this, stir-cast AZ91D magnesium hybrid composites with reinforcements made of 1-3% yttrium oxide (Y2O3) and 1% cerium dioxide (CeO2) were developed. The research was done on how different RE oxide weight percentages affected the microstructure, mechanical properties, and wear characteristics. The sliding wear property of composite materials was experimented using pin-on-disc test equipment by varying the applied weight, sliding speed, and time. A study was conducted on the wear characterizations, SEM images, EDAX and metallographic analysis. The SEM pictures showed that there was no agglomeration and that the distribution of the Y2O3 and CeO2 particles in the matrix were rather homogeneous. In composites supplemented with RE oxides, the obtained findings demonstrated an increased tensile strength (11-33%), hardness (6-30%), and the formation of stable oxide surface layers. When compared to magnesium alloy that was cast in its original form, the RE reinforced hybrid composites demonstrated improved wear resistance (9-29% higher wear resistance). The worn surface of the investigated specimen underwent wear processes such as wear melt, induced delamination, oxidation, and particle cracking.