Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying

Morgane Mokhtari, Christophe Le Bourlot, Jérome Adrien, Anne Bonnin, Takeshi Wada, Jannick Duchet-Rumeau, Hidemi Kato, Eric Maire

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

Liquid metal dealloying is a promising technique to get nanoporous materials which are attractive for their excellent functional properties. From a (FeCr)x-Ni1−x precursor, it is possible to get porous FeCr with this technique. While immersing precursors in a molten Mg bath, Ni atoms selectively migrate into the Mg bath. After cooling down to room temperature, the resulting microstructure is a bi-continuous structure of FeCr and Mg (with Ni in solid solution). A final etching step removes the Mg solid-state solution phase. Precursors with different compositions were dealloyed and imaged in 3D. From X-ray tomography images, porous FeCr characteristics as solid fraction, phase size, specific surface were extracted. EBSD maps were acquired on samples before and after dealloying. We will show that precursor composition is a key parameter to control pores and grains size while dealloying parameters (time and temperature) are key parameters to control ligaments size and in fine specific surface. By controlling precursor composition and dealloying parameters it is now possible to get dealloyed nanoporous metals with desired grain and porous microstructure by liquid metal dealloying.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalMaterials Characterization
Volume144
DOIs
Publication statusPublished - 2018 Oct

Keywords

  • Dealloying
  • EBSD
  • Fe
  • Porous
  • X-ray tomography

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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