Evolution of a bicontinuous nanostructure via a solid-state interfacial dealloying reaction

The solid dealloying reaction was investigated using (Fe,Cr)-Ni and Mg diffusion couples. Ni selectively reacted with Mg and the remaining Fe and Cr formed various topologies. An etching treatment provided interconnected Fe–Cr alloy with a ligament width below 200nm, which is about one order of magn...

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Bibliographic Details
Published in:Scripta materialia 2016-06, Vol.118, p.33-36
Main Authors: Wada, Takeshi, Yubuta, Kunio, Kato, Hidemi
Format: Article
Language:English
Subjects:
Dealloying
Diffusion
Etching
Evolution
Foam
Interface diffusion
Intermetallic compounds
Melts
Nanostructure
Nickel
Porous material
Topology
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Summary:The solid dealloying reaction was investigated using (Fe,Cr)-Ni and Mg diffusion couples. Ni selectively reacted with Mg and the remaining Fe and Cr formed various topologies. An etching treatment provided interconnected Fe–Cr alloy with a ligament width below 200nm, which is about one order of magnitude finer than that obtained for dealloying with Mg melt. The formation of ordered single-crystal nanofilaments at the dealloying front suggests that the topology evolved via the recently proposed interfacial spinodal decomposition and diffusion-coupled growth mechanism. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2016.03.008