Micro-ballistic impact of a Co₃₃Os₂₀Ta₁₀B₃₇ metallic glass with ultrahigh dynamic strength

Metallic glasses (MGs) show significant potential for hypervelocity impact protection due to their high hardness and dynamic strength. In this study, the protective performance of a new Co₃₃Os₂₀Ta₁₀B₃₇ MG was systematically evaluated. Plate impact experiments revealed an ultra-high Hugoniot elastic limit (HEL) up to 19 GPa, setting a new record for metallic materials. Using the laser-induced micro-particle impact test (LIPIT), we characterized the impact response and protective performance of Co₃₃Os₂₀Ta₁₀B₃₇ subjected to SiO₂ micro-particle impact. The results demonstrated a high coefficient of restitution (COR) and dynamic strength for Co₃₃Os₂₀Ta₁₀B₃₇. More importantly, the low impact-mode ratio further indicates that it can efficiently withstand the high-velocity impact of micro-particles, as confirmed by the absence of craters in post-impact surface. These results emphasize the outstanding resistance of Co₃₃Os₂₀Ta₁₀B₃₇ MG to hypervelocity impact, underscoring its promising potential as an advanced protective material.