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

Research output: Contribution to journalArticlepeer-review

Abstract

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
JournalCorrosion
Volume74
Issue number3
DOIs
StatePublished - 2018

Keywords

  • 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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