Experimental Investigation of Zr‐Based Amorphous Alloy as a Shaped Charge Liner

Abstract

This study aimed to investigate the mechanical properties of Zr-based amorphous alloy at high strain rates and its use as a shaped charge liner. A split Hopkinson pressure bar (SHPB) was used to carry out dynamic mechanical performance tests, and a scanning electron microscope (SEM) was used to observe the fracture morphology of the test piece. The X-ray test of the jet formation and the static penetration test of the Zr-based amorphous alloy jet were performed. It was found that the amorphous alloy material exhibits typical brittle fracture characteristics under high strain-rate compression. As the strain rate increases, molten droplet-like structures appear in the frac-ture morphology, and the melting area is proportional to the strain rate. The Zr-based amorphous alloy liner forms a non-cohesive jet driven by explosive explosion. The actual projection angle of the liner is slightly larger than the theoretical value of Taylor's projection angle because of the unique mechanical properties and fracture mechanism, while the collapse angle is slightly smaller. Compared with copper jet penetrating concrete, the aperture of Zr-based amorphous alloy jet is increased by 58 % and the caving volume is increased by 32 times. The results provide reference for the application of Zr-based amorphous alloy in the field of shaped charge liner.

Glass-Forming Ability, Mechanical Properties, and Energetic Characteristics of ZrCuNiAlNbHfY Bulk Metallic Glasses

“…And BMGs have a higher free energy and energyrelease efficiency than crystalline materials [4,5]. Furthermore, since Zr combines a low activation threshold and high calorific value for oxidation reactions, Zr-based BMGs exhibit a dual destructive effect of penetration and deflagration through energy release on targets, which facilitates military applications such as fragmentation warheads and shaped charges [6,7]. However, because of strain softening and the lack of inherent propagation barriers, shear bands may rapidly crack, leading to catastrophic failure at room temperature [8,9].…”