Comparative Wear Evaluation of Pure Zn, Zn-Mg and Zn-Mg-Y Alloys Using Mass Loss Measurements and Optical
Traian-Lucian Severin1, Viorel Paleu2, Costică Bejinariu3,4
1Faculty of Mechanical Engineering, Automotive and Robotics, "Ștefan cel Mare" University of Suceava, 720229 Suceava, Romania.
Abstract:
The present study investigates the dry sliding wear behaviour of pure Zn, Zn-3Mg, and Zn-3Mg-0.5Y biodegradable alloys using mass loss measurements, friction torque monitoring on an Amsler tribometer, and optical profilometry of wear tracks. The microstructure of the Zn-Mg-Y alloy exhibited an α-Zn matrix comprising Zn-Mg intermetallic constituents and dispersed Y-rich phases. Tribological testing at 20 N and 30 N revealed a marked enhancement in wear resistance for Zn-3Mg in comparison to pure Zn, attributable to matrix strengthening by intermetallic phases. Despite the stabilising effect of Y on the friction response, there was no consistent reduction in wear volume under higher loads. Surface investigations have revealed a multifaceted wear mechanism, characterised by a combination of abrasion, oxide tribolayer formation, and localised adhesion. The measured wear rates were found to fall within the range documented in the available literature concerning biodegradable Zn-based alloys, thereby confirming the experimental validity of the findings. In summary, Zn-3Mg exhibited the optimal equilibrium between friction stability and wear resistance under the examined dry sliding conditions. However, further research in physiological environments is necessary to evaluate its biomedical applicability.
