Abstract
Adding rare earth elements to magnesium alloys is an effective way to improve their wear resistance. However, the effect achieved is closely related to the friction condition. In this paper, two different types of welding wires, AZ91 magnesium alloy and AZ91 + gadolinium (Gd), were used for surface welding. Dry sliding friction and wear experiments were performed on the surfacing alloys using the pin-on-disc test. The effects of Gd addition on the wear resistance and wear mechanism of the alloy were systematically studied under low to high loads. The results show that as the load increases, the friction coefficient of the surfacing AZ91 alloy gradually decreases as the wear rate increases. A mild–severe wear transition occurred at 100 N. The addition of Gd only slightly increased the wear rate under a load of 15 N. The wear rate was significantly decreased with loads in the range of 30 to 100 N and mild–severe wear transition was avoided. The influence of both Gd addition and load on the wear mechanism were considered. The overall wear resistance of the surfacing magnesium alloy was determined.
Highlights
Magnesium alloys offer several advantages associated with their low density, high specific strength, and high damping capacities
If wear is not managed in a timely manner, local damage accumulation can lead to failure of the whole structure
Magnesium alloy wire with a diameter of 3 mm was used as the filler material, which was prepared by ingot casting, extrusion, and drawing
Summary
Magnesium alloys offer several advantages associated with their low density, high specific strength, and high damping capacities. As a traditional surface cladding technology, surface welding can be used to effectively and rapidly repair local damage on the surface of magnesium alloy structures. This can significantly reduce maintenance costs, conserve material resources, and strengthen the surface of the material [2–4]. Wear is an important failure mechanism that can seriously affect the service life of magnesium alloys and other metals. This is relevant for those used in tribological applications, such as artificial joints, gears, and pistons, and limits their potential range of application [5]
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
