# Comparative Wear Evaluation of Pure Zn, Zn–Mg and Zn–Mg–Y Alloys Using Mass Loss Measurements and Optical Profilometry

## TL;DR

This study compares the wear resistance of pure zinc and zinc-based alloys under dry sliding conditions to assess their potential for biomedical applications.

## Contribution

The study introduces a comparative evaluation of Zn–Mg and Zn–Mg–Y alloys using mass loss and optical profilometry for wear analysis.

## Key findings

- Zn–3Mg showed improved wear resistance compared to pure Zn due to matrix strengthening by intermetallic phases.
- Y addition stabilized friction but did not consistently reduce wear volume under higher loads.
- Wear mechanisms included abrasion, oxide tribolayer formation, and localized adhesion.

## 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.