Journal
RARE METALS
Volume 40, Issue 8, Pages 2206-2212Publisher
NONFERROUS METALS SOC CHINA
DOI: 10.1007/s12598-020-01420-6
Keywords
Magnesium; Wear resistance; Scandium; Hardness; Biodegradable
Funding
- National Natural Science Foundation of China [51174025]
- National Key Research and Development Program of China [2016YFB0301105, 2017YFB0103904]
- Shandong Provincial Natural Science Foundation [ZR2017LEM002]
- Specialized Fund for Shandong Postdoctoral Innovation Project [201703093]
- Youth Science Funds of Shandong Academy of Sciences [2018QN0034]
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Rare earth metal Sc has a significant impact on the wear resistance of magnesium alloys, reducing the friction coefficient and weight loss. The addition of Sc refines the grain size and improves the strength and hardness of the alloys, thereby enhancing the wear resistance of magnesium alloys.
Magnesium alloys exhibit significant potential for use in next-generation biodegradable materials. Implanted magnesium alloys are expected to exhibit good wear resistance. In this work, the effects of rare earth metal Sc on the wear resistance of biodegradable magnesium alloys were studied. The average grain sizes of Mg-1.5Zn-0.6Zr-xSc (ZK21-xSc,x = 0, 0.2, 0.5, 1.0; wt%) alloys decreased with Sc content increasing. Unlike other rare earth metals, the grain refinement mechanism of Sc belongs to the heterogeneous nucleation mechanism. The yield tensile strengths and Vickers hardness of the ZK21-xSc alloys markedly improved with the addition of Sc increasing. This could be due to the grain refinement and enhanced bond energy resulting from Sc addition. Moreover, the friction and wear tests showed that the friction coefficient of the alloys decreased and the weight loss reduced with Sc addition increasing. This implies that Sc addition could enhance the wear resistance of magnesium alloys. With the addition of Sc increasing, the peeling phenomenon weakened gradually and the worn surfaces of samples became smoother. The major wear mechanisms of the as-cast ZK21-xSc alloys were abrasion wear and delamination wear. Graphic abstract
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