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- Title
Leaching of rapidly quenched $$\hbox {Al}_{65} \hbox {Cu}_{20}\hbox {Fe}_{15}$$ quasicrystalline ribbons.
- Authors
Mishra, S; Yadav, T; Mukhopadhyay, N; Srivastava, O
- Abstract
In the present work, $$\hbox {Al}_{65}\hbox {Cu}_{20}\hbox {Fe}_{15}$$ alloy has been synthesized by melting of pure elements (e.g., Al (99.96%), Cu (99.99%) and Fe (99.98%)), using a radiofrequency induction melting furnace. The as-prepared alloy was subjected to rapid solidification by melt spinning technique at $$\sim $$ 3500 rpm speed on a copper disk of diameter 14 cm. As a result of the melt spinning, nearly 2 mm wide, $$30{-}40\,{\upmu }\hbox {m}$$ thick and 4-5 cm long ribbons were formed. The structural and microstructural characterizations were carried out by X-ray diffraction and transmission electron microscopy techniques. We have performed leaching operation using 10 mol NaOH aqueous solution on the surface using a pipette. Leaching was performed for various durations ranging from 30 min to 8 h. After leaching, the reflectivity reduces and the surface looks reddish brown. The microstructure of the 8 h leached sample shows a breakdown of the quasicrystalline phase but with the evolution of other metallic phases. Copper (Cu) particles are found to be present on the surface of quasicrystal after 4 h of leaching and relatively more iron (Fe) evolves during further leaching of 8 h. This low-cost method to prepare a distribution of nano-Cu/Fe metal particles encourages their uses in catalytic reactions, indicating the possibility of use of quasicrystals as the industrial catalysts.
- Subjects
LEACHING; QUENCHING (Chemistry); MOLECULAR evolution; X-ray diffraction; QUASICRYSTALS; MELT spinning; RIBBONS
- Publication
Bulletin of Materials Science, 2017, Vol 40, Issue 7, p1529
- ISSN
0250-4707
- Publication type
Article
- DOI
10.1007/s12034-017-1506-x