Abstract

In the present investigation, we have synthesized a single-phase high-entropy alloy in Al-Cu-Fe-Ni-Ti system by melting of the individual metals using a radiofrequency induction furnace under an argon environment. The as-synthesized alloy shows the formation of a B2-type ordered phase with a lattice parameter of 0.289nm. The mechanical stability of this single phase high-entropy alloy was investigated under high-energy ball milling. The milling was performed at a speed of 400rpm for 10, 20, and 40h under a hexane medium with a ball-to-powder ratio of 40:1. The formation of nano crystallites (~ 10nm sizes) body centered cubic (BCC) phase (disordered B2) has been observed after 40h of ball milling, which has been confirmed by X-ray diffraction and transmission electron microscopic investigation. The equiatomic Al-Cu-Fe-Ni-Ti high entropy alloy structure is observed to be quite stable during mechanical milling up to 40h; only grain refinements and lattice strain accumulation were observed with milling time.

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