Early stage of oxidation of Mo3Si by in situ environmental transmission electron microscopy

A. Gulec, X. X. Yu*, M. Taylor, A. Yoon, J. M. Zuo, J. H. Perepezko, L. D. Marks

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Ni-based superalloys, which have been used in aerospace and power-generation gas-turbine engines operating at high temperatures, are serving near their melting point. There is a drive to increase turbine inlet temperatures to increase overall efficiency, but the currently commercially used materials have reached their limits. With a higher melting temperature, and favorable mechanical, creep, and oxidation properties, Mo-Si-based superalloys are of interest as a new family of high-temperature materials to replace Ni-based alloys. By means of in situ environmental transmission electron microscope, the transient period of the early oxidation of Mo3Si was investigated at the nanometer scale. As a result of a competition between loss of volatile MoO3 and association of SiO2 molecular units into pillars, a nanometer-sized porous SiO2 grows at a very initial stage of the oxidation of Mo3Si.

Original languageEnglish (US)
Pages (from-to)288-294
Number of pages7
Issue number3
StatePublished - 2018


  • In situ environmental transmission electron microscope (ETEM)
  • Mo-Si-based superalloy
  • Oxidation
  • Porous

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)


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