Friction and wear characterization of ZE41 magnesium alloy for medical implants

Abstract

In current research work, investigations were carried out to analyze the microstructural characterization, tribological, and corrosion behavior of ZE41 Mg alloy. The selected Mg rare earth alloy finds potential applications in the biomedical field, particularly in orthopedic implants, owing to its lightweight, excellent biocompatibility, high biodegradability, and high strength at elevated temperatures, excellent creep resistance, weldability, good corrosion resistance, and better tribological properties. The microstructural analysis of the base alloy showed a uniform distribution of β-phase particles within the α-Mg matrix, featuring a distribution of Τ-phase particles eutectically at the grain boundaries. Corrosion analysis of ZE41 Mg alloy samples was performed using the Tafel test, indicating a corrosion rate of 1.354 mmpy. Tribological characterization of specimens was conducted by performing wear between 10 N and 30 N at various loads, and observed delamination, cracks, and grooves as wear mechanisms. Additionally, the analysis shows that as the applied load gradually increases, the wear volume also rises. The mechanism of wear shifts from delamination at lower loads to plastic deformation when subjected to higher loads.