Dynamic mechanical behaviors and fracture characteristic of tungsten fiber reinforced Zr-based metallic glass matrix composites

Tungsten fiber reinforced ZrTiCuNiBe metallic glass composites were fabricated by melt infiltrating casting method. The samples are 6 mm in diameter with aspect ratio of 1. They were tested by using Hopkinson pressure bar, SEM and XRD. The experimental results show that the dynamic compressive strength increases both with increasing volume fraction of W fiber and decreasing tungsten fiber diameter. The dynamic compressive strength of the composites is 2600 MPa when the tungsten fibers are 60% in volume fraction and 0.25 mm in diameter. The failure mode is a mixed fracture mode consisting of share and splitting. The delamination of tungsten fibers are also found in the matrix. The typical melt and thermal-softening characteristic of Zr-based metallic glass matrix are found in the dynamic compressive process.