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

10 Citations (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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