Dealloying-induced phase transformation in Fe–Rh alloys

Nanoporous metals produced by dealloying have aroused enormous interest due to exotic mechanical and physico-chemical properties that are usually inaccessible in their bulk form. Interestingly, when binary solid-solution alloys, such as Ag–Au dealloyed, the resulting nanoporous inherit crystal structure of parent alloys. In this Letter, we examined evolution during Fe–Rh alloys show single-phase solubility over a large range compositions. situ x-ray diffraction shows crystallographic Fe85Rh15 alloy transforms from original bcc fcc dealloying. Transmission electron microscopy confirms sample, which exhibits typical bi-continuous porous with ligament sizes only 2–3 nm high Fe concentration. The bcc–fcc transformation is driven chemical disordering Rh atoms, induced highly dynamic dissolution diffusion process at alloy/electrolyte interface. Our study highlights massive consequent disordered arrangement elemental components structure.