Dependence of mechanical and thermoelectric properties of Mg 2 Si-Sn nanocomposites on interface density

Gwansik Kim, Hwijong Lee, Hyun Jun Rim, Jeongmin Kim, Kwanlae Kim, Jong Wook Roh, Soon Mok Choi, Byung Wook Kim, Kyu Hyoung Lee, Wooyoung Lee

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We prepared Sn nanoparticle-embedded Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 nanocomposites and measured their thermoelectric properties and fracture toughness to elucidate the trade-off relationship between thermoelectric and mechanical properties. When Sn nanoparticles (50–150 nm) were introduced at the grain boundaries of the thermoelectric Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 matrix, the fracture toughness improved because of the inhibition of crack propagation. However, the power factor deteriorated due to the decrease in carrier mobility. We found that interface (between thermoelectric matrix and nanoparticles) density is a critical factor to determine the mechanical properties as well as thermoelectric transport properties. Optimized values of figure of merit (∼0.66 @ 873 K) and fracture toughness (1.10 MPa m 1/2 ) were obtained for 0.9 vol % Sn nanoparticle-embedded Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 nanocomposite.

Original languageEnglish
Pages (from-to)53-58
Number of pages6
JournalJournal of Alloys and Compounds
Volume769
DOIs
Publication statusPublished - 2018 Nov 15

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Nanocomposites
Nanoparticles
Fracture toughness
Mechanical properties
Carrier mobility
Transport properties
Crack propagation
Grain boundaries

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Kim, Gwansik ; Lee, Hwijong ; Rim, Hyun Jun ; Kim, Jeongmin ; Kim, Kwanlae ; Roh, Jong Wook ; Choi, Soon Mok ; Kim, Byung Wook ; Lee, Kyu Hyoung ; Lee, Wooyoung. / Dependence of mechanical and thermoelectric properties of Mg 2 Si-Sn nanocomposites on interface density In: Journal of Alloys and Compounds. 2018 ; Vol. 769. pp. 53-58.
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Dependence of mechanical and thermoelectric properties of Mg 2 Si-Sn nanocomposites on interface density . / Kim, Gwansik; Lee, Hwijong; Rim, Hyun Jun; Kim, Jeongmin; Kim, Kwanlae; Roh, Jong Wook; Choi, Soon Mok; Kim, Byung Wook; Lee, Kyu Hyoung; Lee, Wooyoung.

In: Journal of Alloys and Compounds, Vol. 769, 15.11.2018, p. 53-58.

Research output: Contribution to journalArticle

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AU - Kim, Gwansik

AU - Lee, Hwijong

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AU - Kim, Jeongmin

AU - Kim, Kwanlae

AU - Roh, Jong Wook

AU - Choi, Soon Mok

AU - Kim, Byung Wook

AU - Lee, Kyu Hyoung

AU - Lee, Wooyoung

PY - 2018/11/15

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N2 - We prepared Sn nanoparticle-embedded Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 nanocomposites and measured their thermoelectric properties and fracture toughness to elucidate the trade-off relationship between thermoelectric and mechanical properties. When Sn nanoparticles (50–150 nm) were introduced at the grain boundaries of the thermoelectric Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 matrix, the fracture toughness improved because of the inhibition of crack propagation. However, the power factor deteriorated due to the decrease in carrier mobility. We found that interface (between thermoelectric matrix and nanoparticles) density is a critical factor to determine the mechanical properties as well as thermoelectric transport properties. Optimized values of figure of merit (∼0.66 @ 873 K) and fracture toughness (1.10 MPa m 1/2 ) were obtained for 0.9 vol % Sn nanoparticle-embedded Mg 1.96 Al 0.04 Si 0.97 Bi 0.03 nanocomposite.

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