TY - JOUR
T1 - Microstructure characterization by X-ray tomography and EBSD of porous FeCr produced by liquid metal dealloying
AU - Mokhtari, Morgane
AU - Le Bourlot, Christophe
AU - Adrien, Jérome
AU - Bonnin, Anne
AU - Wada, Takeshi
AU - Duchet-Rumeau, Jannick
AU - Kato, Hidemi
AU - Maire, Eric
N1 - Funding Information:
This work was supported by Région Rhone-Alpes [CMIRA 138249 ], Erasmus+ program and the French Ministry of Higher Education and Research .
Funding Information:
This work was supported by Région Rhone-Alpes [CMIRA 138249], Erasmus+ program and the French Ministry of Higher Education and Research.
Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/10
Y1 - 2018/10
N2 - 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.
AB - 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.
KW - Dealloying
KW - EBSD
KW - Fe
KW - Porous
KW - X-ray tomography
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U2 - 10.1016/j.matchar.2018.06.032
DO - 10.1016/j.matchar.2018.06.032
M3 - Article
AN - SCOPUS:85049755217
VL - 144
SP - 166
EP - 172
JO - Materials Characterization
JF - Materials Characterization
SN - 1044-5803
ER -