Enhanced mechanical and corrosion properties of cold-rolled CoCrFeMoNi high-entropy alloy, as a proposed material for vascular stents

Abstract

Studying stent materials has been done extensively, but their significance and wide use continue to make them a topic of ongoing research in the scientific community. Multi-component high-entropy alloys are unique and distinguishable from traditional alloys because of their properties. This study describes the design and synthesis of a non-equivalent atomic ratio CoCrFeMoNi HEA. Following cold-rolling processing, the structural and mechanical behavior of this alloy was examined, and its ability for usage as vascular stent implants was explored. By forming numerous twins in the presence of Mo, the FCC solid-solution matrix created a combination of strength and ductility. Potentiodynamic polarization measurements and electrochemical impedance spectroscopy were conducted in Hank's solution at 37 °C. The findings demonstrated that all the samples exhibited superior corrosion resistance compared to the 316 L alloy, with the 60% and 70% cold-rolled samples showing the lowest corrosion rate. The SEM results of the corroded surfaces confirmed the occurrence of general corrosion. Also, in the alloy's design, elements that are widely used in the manufacturing of stents were chosen to be potentially biocompatible. All the results suggest that this alloy possesses features that make it suitable for vascular stent implants, and could enhance their capabilities.