[en] The dynamic structure factors, S(Q,E), for the Zr₇₀Be₃₀, Zr₆₀Be₄₀ and Zr₅₀Be₅₀ metallic glasses have been measured using neutron inelastic scattering on the IN4 spectrometer (ILL, Grenoble, France), over the range of momentum transfers 0.7 < ℎ Q (A^-1) < 7 and energy transfers 2< E (meV)<60. The constant-Q cuts through the dynamic structure factor and longitudinal current correlation function, J_l(Q,E), were obtained. The dispersion relations for two representations, S(Q,E) and J_l(Q,E), were derived by fitting a Gaussian to the peaks. The specific low-energy modes (∼5 meV) as well as 'acoustic-phonon like' (∼16 meV) and 'optic-phonon like' excitations (∼47 meV) were observed in these metallic glasses with disparate mass and ionic radius components