Dynamic compressive properties of two tungsten structure reinforced Zr-based metallic glass composites at different temperatures

Tungsten structure reinforced composites are materials that the tungsten structure is embedded into the metallic glass to prevent the shear bands from developing in the metallic glass. In order to expand their application and understand their mechanical properties, dynamic compression tests were performed for two Zr-based metallic glass composites reinforced by tungsten fiber and porous tungsten, respectively, by using a SHPB device at three different temperatures and various strain rates. Comparison of the dynamic mechanical properties between the two composites reveals that they both have considerable stain rate sensitivity and excellent plastic deformation ability, but they have different deformation mechanisms. The deformation of the tungsten fiber reinforced Zr-based metallic glass composite is due to the local structure instability or thermal instability of tungsten fibers. And this phenomenon was numerically simulated. On the other hand, the loading of the porous tungsten reinforced Zr-based metallic glass composite at the beginning is mainly carried by tungsten skeleton rather than the combined action of the components, which makes the yield stress of the porous tungsten reinforced composite smaller than those of both pure Zr-based metallic glass and pure tungsten.