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MgO-incorporated carbon nanotubes-reinforced Mg-based composites to improve mechanical, corrosion, and biological properties targeting biomedical applications

Abazari, S ; Sharif University of Technology | 2022

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jmrt.2022.06.154
  3. Publisher: Elsevier Editora Ltda , 2022
  4. Abstract:
  5. In this study, magnesium oxide (MgO) nanoparticles are incorporated on carbon nanotubes (CNTs) to reinforce Mg-3Zn-1Mn alloy (ZM31 alloy) by semi-powder metallurgy, followed by hot extrusion, with the purpose of improving the mechanical and biological properties of Mg-based alloy. The microstructural analysis of the nanocomposites indicated a reduction in grain size of Mg alloy with the incorporation of CNTs with a maximum reduction of 61% (ZM31/CNTs), with further reduction in grain size (68%) detected when MgO integrated CNTs composites (ZM31/MgO-CNTs). The compression characteristics of the composites indicate an increase in ultimate compressive strength of 36% and 44%, respectively, with the incorporation of CNTs and MgO-CNTs fillers, and the hardness of Mg alloy increases by 37% and 58%, respectively, with the incorporation of CNTs and MgO-CNTs fillers. The strengthening mechanisms of Mg alloy composites reinforced with MgO-CNTs were discussed. Furthermore, MgO bounded CNTs fillers decelerated the degradation rate of Mg-based alloys, whereas the introduction of CNTs to Mg alloy had a less significant effect. Besides, the ZM31/MgO-CNTs composite indicated superior cytocompatibility because of its lower corrosion rates. According to the overall results, the outstanding mechanical performance, appropriate corrosion characteristics, and good cytocompatibility of the ZM31/MgO-CNTs composites verified their potential in medical fields. © 2022 The Author(s)
  6. Keywords:
  7. Biological property ; Corrosion behavior ; Mechanical property ; Mg-based composite ; MgO-CNTs fillers ; Carbon nanotubes ; Compressive strength ; Corrosion rate ; Corrosive effects ; Degradation ; Fillers ; Grain size and shape ; Magnesium alloys ; Manganese alloys ; Mechanisms ; Medical applications ; Powder metallurgy ; Reinforcement ; Ternary alloys ; Zinc alloys ; % reductions ; Biological properties ; Carbon nanotube fillers ; Carbon nanotubes composites ; Corrosion behaviour ; Magnesium oxide-carbon nanotube filler ; Mechanical ; Mg alloy ; Mg based composites ; Oxide-carbon nanotube ; Magnesia
  8. Source: Journal of Materials Research and Technology ; Volume 20 , 2022 , Pages 976-990 ; 22387854 (ISSN)
  9. URL: https://www.sciencedirect.com/science/article/pii/S2238785422010146