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Materials 2018, 11(2), 250; https://doi.org/10.3390/ma11020250

Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy

1
School of Materials Science & Engineering, Northeastern University, Shenyang 110819, China
2
Key Laboratory of Electromagnetic Processing of Materials, Ministry of Education, Northeastern University, Shenyang 110819, China
*
Author to whom correspondence should be addressed.
Received: 3 January 2018 / Revised: 31 January 2018 / Accepted: 1 February 2018 / Published: 6 February 2018
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Abstract

In this study, the effects of cerium (Ce) addition on the friction and wear properties of surface welding AZ91 magnesium alloys were evaluated by pin-on-disk dry sliding friction and wear tests at normal temperature. The results show that both the friction coefficient and wear rate of surfacing magnesium alloys decreased with the decrease in load and increase in sliding speed. The surfacing AZ91 alloy with 1.5% Ce had the lowest friction coefficient and wear rate. The alloy without Ce had the worst wear resistance, mainly because it contained a lot of irregularly shaped and coarse β-Mg17Al12 phases. During friction, the β phase readily caused stress concentration and thus formed cracks at the interface between β phase and α-Mg matrix. The addition of Ce reduced the size and amount of Mg17Al12, while generating Al4Ce phase with a higher thermal stability. The Al-Ce phase could hinder the grain-boundary sliding and migration and reduced the degree of plastic deformation of subsurface metal. Scanning electron microscopy observation showed that the surfacing AZ91 alloy with 1.5% Ce had a total of four types of wear mechanism: abrasion, oxidation, and severe plastic deformation were the primary mechanisms; delamination was the secondary mechanism. View Full-Text
Keywords: AZ91 magnesium alloy; surfacing weld; wear resistance; cerium AZ91 magnesium alloy; surfacing weld; wear resistance; cerium
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Chen, Q.; Zhao, Z.; Zhu, Q.; Wang, G.; Tao, K. Cerium Addition Improved the Dry Sliding Wear Resistance of Surface Welding AZ91 Alloy. Materials 2018, 11, 250.

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