Graphene nanoplatelets-reinforced magnesium metal matrix nanocomposites with superior mechanical and corrosion performance for biomedical applications  

作　　者：Khurram Munir Cuie Wen Yuncang Li 

机构地区：[1]School of Engineering,RMIT University,Melbourne,Victoria 3001,Australia

出　　处：《Journal of Magnesium and Alloys》2020年第1期269-290,共22页镁合金学报（英文）

基　　金：The authors acknowledge the financial support for this research by the Australian Research Council(ARC)through the Future Fellowship(FT160100252);the Discovery Project(DP170102557);The authors also acknowledge the scientific and technical assistance of RMIT University’s Microscopy and Microanalysis Facility(RMMF);a linked laboratory of the Australian Microscopy&Microanalysis Research Facility.

摘　　要：Magnesium(Mg)metal matrix composites(MMCs)reinforced with graphene nanoplatelets(GNPs)have been developed by powder metallurgy(PM).GNPs with different concentrations(0.1,0.2,and 0.3 wt.%),layer thicknesses(5 nm and 9 nm),and particle sizes(15μm and 5μm)were dispersed into Mg powder by high-energy ball-milling processes.The microstructure and mechanical properties of the fabricated composites were characterized using transmission electron microscopy(TEM),scanning electron microscopy(SEM),energy dispersive X-ray spectroscopy(EDX),X-ray diffraction(XRD),Raman spectroscopy(RS),and compression tests.The corrosion resistance was evaluated by electrochemical tests and hydrogen evolution measurements.The cytotoxicity of Mg-GNPs composites was assessed using osteoblast-like SaOS2 cells.The results indicate that GNPs are excellent candidates as reinforcements in Mg matrices for the manufacture of biodegradable Mg-based composite implants.GNP addition improved the mechanical properties of Mg via synergetic strengthening modes.Moreover,retaining the structural integrity of GNPs during processing improved the ductility,compressive strength,and corrosion resistance of the Mg-GNP composites.Cytotoxicity assessments did not reveal any significant toxicity with the addition of GNPs to Mg matrices.This study demonstrates that Mg-xGNPs with x<0.3 wt.%,may constitute novel biodegradable implant materials for load-bearing applications.

关 键 词：In vitro cytotoxicity BIOCORROSION Magnesium-graphene composite Mechanical properties Strengthening mechanisms 

分 类 号：R318.08[医药卫生—生物医学工程] TB333[医药卫生—基础医学]