Macro- and microscale metallic glasses exhibit excellent protective capability under hypervelocity projectile impact conditions. However, it is formidably challenging to evaluate the ballistic performance of metallic glasses with characteristic sizes down to the nanoscale. Here, we adopt the laser-induced micro-particle impact technique to penetrate 60-nm-thick Ni₆₀Ta₄₀ metallic glass nanofilms with projectile velocities in the range of 186–540 m/s. Based on the ballistic analysis, the superior impact resistance of the metallic glass nanofilms is quantitatively characterized in terms of the specific penetration energy. The post-mortem observations of the penetration features reveal that shear-banding, cracking, and bending of cracking-induced petals are the main energy dissipation modes beyond the localized perforated hole, which is strongly dependent on impact velocities. This work for the first time achieves high-strain-rate loading on nanoscale metallic glasses, and extends their engineering applications as promising armor materials for high-velocity impact protection.

宏观和微观金属玻璃在超高速弹丸撞击条件下均具有出色的防护能力。然而，评估特征尺寸低至纳米级的金属玻璃的防弹性能是一项艰巨的挑战。在这里，我们采用激光诱导的微粒撞击技术穿透厚度为60 nm的Ni ₆₀ Ta ₄₀弹丸速度在186–540 m / s范围内的金属玻璃纳米膜。基于弹道分析，根据比穿透能定量地表征了金属玻璃纳米膜的优异抗冲击性。对穿刺特征的事后观察表明，开裂引起的花瓣的剪切带，开裂和弯曲是局部穿孔以外的主要能量耗散模式，这主要取决于冲击速度。这项工作首次实现了在纳米级金属玻璃上的高应变率负载，并将其工程应用扩展为用于高速冲击防护的有前途的装甲材料。