Influence of ZrC and ZrO2 Reinforcements on the Microstructure, Mechanical Properties, and Wear Resistance of AA8005 Aluminum Matrix Composites

Abstract

In this study, authors examined the various impacts of a stir-cast ZrC and ZrO₂ particle-reinforced AA8005 matrix composite on the material’s physical and mechanical properties and its evaluation of its microstructure and resistance to wear. ZrO₂ and ZrC reinforcement were uniformly dispersed throughout the aluminium matrix without developing an intermetallic complex, which are unwanted compounds formed between metals that could create brittle phases within the composite, according to XRD measurements. With the addition of ZrC and ZrO₂ reinforcement, the aluminum matrix composite’s ultimate tensile strength (UTS) and microhardness increased. Because of enhanced bonding and a clean interface of reinforced particles, ZrC and ZrO₂ reinforced composite had a much higher ultimate tensile strength than unreinforced AA8005 matrix. An even dispersion of ZrC and ZrO₂ particles inside the matrix is revealed by microstructural investigation using SEM and EDX, which is essential for obtaining the mechanical improvements that have been seen. ZrO₂-reinforced composites demonstrate outstanding wear resistance across a range of loads and sliding circumstances, according to unlubricated pin-on-disc (POD) testing, which was used to evaluate the composites’ wear resistance. Because of ZrO₂ particles’ superior interfacial bonding and great hardness, this phenomenon is explained. The efficiency of ceramic particle reinforcement in enhancing aluminum matrix composites is confirmed by the study’s results, which are consistent with previous research. Notwithstanding, certain obstacles were detected, such as heightened porosity and the economical viability of the reinforcements, emphasizing the need for additional investigation. Overall, this study provides valuable insights into the development of high-performance aluminum matrix composites, emphasizing the benefits of ZrC and ZrO₂ reinforcements in enhancing mechanical properties and wear resistance.