Compressive creep behavior of hot-pressed Mg1.96Al0.04Si0.97Bi0.03

Richard A. Michi, Gwansik Kim, Byung Wook Kim, Wooyoung Lee, David C. Dunand

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The compressive creep behavior of hot-pressed Mg1.96Al0.04Si0.97Bi0.03, a promising thermoelectric material, is investigated at 500 °C. At stress levels between 81 and 212 MPa, dislocation creep with stress exponent n = 7.6 ± 0.3 is observed. No diffusional creep is observed, likely attributable to a dispersion of ~1 μm Bi-, Al-, and O- rich particles which pin grain boundaries. Mg1.96Al0.04Si0.97Bi0.03 exhibits similar creep behavior to previously studied silicides, but is significantly more creep resistant than other thermoelectric materials, PbTe and Bi2Te3. This makes Mg1.96Al0.04Si0.97Bi0.03 an excellent material for thermoelectric power generation systems subjected to high stresses and temperatures.

Original languageEnglish
Pages (from-to)10-14
Number of pages5
JournalScripta Materialia
Volume148
DOIs
Publication statusPublished - 2018 Apr 15

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Creep
thermoelectric materials
thermoelectric power generation
silicides
grain boundaries
Silicides
exponents
Thermoelectric power
Power generation
Grain boundaries
temperature
Temperature

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Michi, Richard A. ; Kim, Gwansik ; Kim, Byung Wook ; Lee, Wooyoung ; Dunand, David C. / Compressive creep behavior of hot-pressed Mg1.96Al0.04Si0.97Bi0.03. In: Scripta Materialia. 2018 ; Vol. 148. pp. 10-14.
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Compressive creep behavior of hot-pressed Mg1.96Al0.04Si0.97Bi0.03. / Michi, Richard A.; Kim, Gwansik; Kim, Byung Wook; Lee, Wooyoung; Dunand, David C.

In: Scripta Materialia, Vol. 148, 15.04.2018, p. 10-14.

Research output: Contribution to journalArticle

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AU - Michi, Richard A.

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AB - The compressive creep behavior of hot-pressed Mg1.96Al0.04Si0.97Bi0.03, a promising thermoelectric material, is investigated at 500 °C. At stress levels between 81 and 212 MPa, dislocation creep with stress exponent n = 7.6 ± 0.3 is observed. No diffusional creep is observed, likely attributable to a dispersion of ~1 μm Bi-, Al-, and O- rich particles which pin grain boundaries. Mg1.96Al0.04Si0.97Bi0.03 exhibits similar creep behavior to previously studied silicides, but is significantly more creep resistant than other thermoelectric materials, PbTe and Bi2Te3. This makes Mg1.96Al0.04Si0.97Bi0.03 an excellent material for thermoelectric power generation systems subjected to high stresses and temperatures.

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