Anisotropic dynamic mechanical response of tungsten fiber/Zr-based bulk metallic glass composites

The anisotropic dynamic mechanical behavior of the W fiber/Zr-based bulk metallic glass composites (W_f/BMGCs) with different W fiber orientations (θ_f) were investigated by split Hopkinson pressure bar (SHPB) and finite element method (FEM). The composites exhibited the most excellent mechanical properties at θ_f of 0° while the poorest at θ_f of 45°. The composites failed by longitudinal splitting at θ_f of 0°, shearing at θ_f of 45°, a mixture of shearing and splitting during 0° < θ_f < 45° or 45° < θ_f < 90°, and a mixture of shearing and transverse splitting at θ_f of 90°. Strain rate sensitivity of the composites also varied with θ_f, exhibiting positive strain rate sensitivity at θ_f of 0°, 15°, 60°, and 75° ranging from the strain rate of 10^-3 to 2.1 × 10³ s^-1, positive strain rate sensitivity with the strain rate ranging from 10^-3 to 10^-2 s^-1 but negative strain rate sensitivity from 10^-2 to 2.1 × 10³ s^-1 at θ_f of 30° and 90°, and even strain rate insensitivity at θ_f of 45°.