  High Entropy Alloys (HEAs) are designed by mixing multiple metallic species
in nearly the same amount to obtain crystalline or amorphous materials with
exceptional mechanical properties. Here we use molecular dynamics simulations
to investigate the role of positional and compositional disorder in determining
the low-frequency vibrational properties of CrMnFeCoNi HEAs. Our results show
that the expected dependence of the density of states on the frequency as
$D(\omega)\sim\omega^4$ is recovered for amorphous HEAs and is also observed
for partially crystallized alloys with deviations that depend on the degree of
crystallization. We find that the quasi-localized vibrations are still visible
in crystalline HEAs, albeit suppressed compared to the corresponding amorphous
alloys. Our work offers a unified perspective to describe HEA mechanical
properties in terms of their vibrational density of states.
