Damping behavior of Al x CoCrFeNi high-entropy alloys by a dynamic mechanical analyzer.

Highlights: [•] The Al content is related with structural relaxation and damping capability. [•] Dynamic modulus is insensitive to the frequency especially for storage modulus. [•] Several internal-friction peaks are observed in the Al-free or Al-lean alloys. [•] The damping behavior is proposed to be strongly relied on the level of ordering. [Copyright &y& Elsevier]