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

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 s...

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Published inCeramics international Vol. 43; no. 15; pp. 12979 - 12982
Main Authors Kim, Gwansik, Lee, Hwijong, Kim, Jeongmin, Roh, Jong Wook, Lyo, Inwoong, Kim, Byung-Wook, Lee, Kyu Hyoung, Lee, Wooyoung
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 15.10.2017
Subjects
Fracture toughness
Mg2Si
Nanoinclusion
Nanometal decoration
Thermoelectric
Mg2Si
Thermoelectric
Nanometal decoration
Nanoinclusion
Fracture toughness
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Summary: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 (~150nm) 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 (~1.10MPam1/2, 35% improvement) was significantly enhanced on introducing Al nanoparticles.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2017.06.002