Microstructure and mechanical property of graphene oxide/AlSi10Mg composites fabricated by laser additive manufacturing

Mingqi Dong, Weiwei Zhou, Kohei Kamata, Naoyuki Nomura

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The low laser absorptivity and high thermal conductivity of Al are the foremost concerns when developing Al matrix composites (AMCs) through laser powder bed fusion (L-PBF) process. In this study, we demonstrated an example of improving the 3D-printability of AMCs by means of powder surface modification. Flexible graphene oxide (GO) sheets were carefully coated onto the surface of AlSi10Mg powders under electrostatic self-assembly via a hetero-agglomeration process. In addition to maintaining a shape and particle size similar to the initial metallic powders, the GO-coated AlSi10Mg powders exhibited enhanced laser absorptivity and decreased thermal conductivity, beneficial to their fusion. Under high-energy irradiation, the GO sheets were partially transformed to Al4C3 nanorods individually distributed in the matrix, while the un-reacted parts floated within molten pools under buoyancy, forming an in-situ carbon layer tightly deposited on the surface of the composite build. This work may provide significant guidance for the design and production of high-performance AMCs with advanced architectures for practical applications.

Original languageEnglish
Article number110678
JournalMaterials Characterization
Volume170
DOIs
Publication statusPublished - 2020 Dec

Keywords

  • Graphene
  • Laser powder bed fusion (L-PBF)
  • Metal matrix composites (MMCs)
  • Microstructural evolution

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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