Enhanced fracture toughness of Al and Bi co-doped Mg2Si by metal nanoparticle decoration

Gwansik Kim, Hwijong Lee, Jeongmin Kim, Jong Wook Roh, Inwoong Lyo, Byung Wook Kim, Kyu Hyoung Lee, Wooyoung Lee

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Abstract

We herein report the effects of metal nanoinclusions (Cu, Al, and Sn) embedded at grain boundaries on the thermoelectric transport and mechanical properties of Mg2Si-based compounds. Hybrid powders of microscale Al and Bi co-doped Mg2Si (Mg1.96Al0.04Si0.97Bi0.03) and nanoscale metal particles were synthesized by a nanometal decoration technique and their nanocomposites were fabricated by a spark plasma sintering process. In compacted polycrystalline bulks, homogeneous dispersion of metal nanoparticles (~150 nm) was readily achieved at grain boundaries. The thermoelectric performance of the nanocomposites deteriorated mainly because of the reduced mobility owing to intensified electron scattering at the phase boundaries between the Mg2Si matrix and metal nanoinclusions, while the fracture toughness (~1.10 MPa m1/2, 35% improvement) was significantly enhanced on introducing Al nanoparticles.

Original languageEnglish
Pages (from-to)12979-12982
Number of pages4
JournalCeramics International
Volume43
Issue number15
DOIs
Publication statusPublished - 2017 Oct 15

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Process Chemistry and Technology
  • Surfaces, Coatings and Films
  • Materials Chemistry

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