Study on fretting wear properties of medical Mg-2.0Zn-1.6Ca alloy

Abstract

Due to its good biocompatibility and biomechanics, magnesium alloy has made great progress in the application of absorbable and implantable biomedical materials in recent years. At the same time, the disadvantages of magnesium alloy materials are more obvious. Because of its poor wear resistance, magnesium alloy is easy to fret with human bones after being implanted as a bone plate, resulting in wear pits and failure. In this paper, magnesium alloy was prepared, calcium and zinc elements were added into pure magnesium according to a certain proportion, and then the magnesium alloy with excellent performance was formed by solid solution treatment and extrusion strengthening. After that, fretting friction type, friction coefficient and wear pits were studied by fretting wear test. The results show that with the decrease of extrusion temperature, the surface hardness increases and the friction coefficient decreases, which is very beneficial to improve the wear resistance of the workpiece. The purpose of this paper is to improve the fretting wear performance of magnesium alloys, and to provide theoretical and practical guidance for the preparation, processing and application of high-performance medical magnesium alloys.