Nanocrystalline Intermetallics in Al-Cu-Fe-Cr Decagonal Quasicrystalline Alloy

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Abstract
In the present investigation, an Al-Cu-Fe-Cr decagonal quasicrystalline alloy synthesized by a slow-cooling technique was mechanically milled in a high-energy ball mill for various times ranging up to 100 hours under liquid hexane medium at the speed of 400 rpm with a ball to powder ratio of 40:1. X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), differential thermal analysis (DTA), and energy-dispersive x-ray analysis (EDX) were employed to characterize the as-cast, milled, and annealed samples. Powders milled for more than 10 h contained predominantly the B2-type nano-crystalline phase with a lattice parameter of ∼0.29 nm. The 100 h milled powder was annealed in air at 500°C for 20–40 h. It was observed that 40 h annealed sample shows the best yield for the fabrication of nanospinel. The processing technique could be optimized to manufacture the composites of nano-quasicrystal, nano-B2, and nanospinels. These materials may be further investigated as a suitable material for pigment industries.

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