Mechanical and nonlinear elastic characteristics of polycrystalline AMg6 aluminum alloy and $n$-AMg6/C$_{60}$ nanocomposite

The influence of nanostructuring on the mechanical and nonlinear elastic characteristics of polycrystalline AMg6 aluminum alloy and $n$-AMg6/C$_{60}$ nanocomposite has been experimentally studied. The independent second- and third-order elastic coefficients are measured via the ultrasonic method. The thir-dorder elastic coefficients have been evaluated via the Tearstone–Bragger approach from the experimentally established velocities of shear and longitudinal bulk acoustic waves as the functions of the uniaxial compression in the studied samples. The nonlinear elastic properties are examined via the spectral acoustic technique in AMg6 aluminum alloy and $n$-AMg6/C$_{60}$ nanocomposite, and the nonlinear acoustic parameters are determined.