Аннотация:All independent second and thirdorder elastic coefficients were measured in the isotropic polycrystalline aluminum alloy AMg6 (Al–Mg–Mn system) using the Ritec RAM5000 SNAP SYSTEM ultrasonic automated complex operating in the pulsed mode. The thirdorder elastic coefficients were determinedusing the Thurston–Bragger method from the experimentally measured velocity of shear and longitudinal elastic waves in AMg6 alloy as a function of uniaxial compression.