By using molecular dynamics simulations, we investigate the tensile response of nanoporous (NP) Cu₅₀Zr₅₀ metallic glasses (MGs) with 3D gyroidal structure. Similar to nanoporous crystalline metals, NP–MGs fail by the plastic necking of ligaments, but shear bandings (SBs) prevail in those thick–ligament specimens. Particularly, with ligament diameter decreasing to 2.34 nm, SBs are hardly observed due to the limit of translation from shear transformation zones, resulting in superior strength and ductility of NP–MGs. The critical ligament size to suppress the formation of SBs is much smaller than those calculated value in MGs. The observations reveal a design strategy that a concurrent high strength and ductility of MGs could be obtained by designing 3D nanoporous structure with supra–nano size. The scaling laws for Young's modulus and strength as functions of relative density and ligament diameters are addressed, consistent with those in nanoporous crystalline materials.

通过使用分子动力学模拟，我们研究了纳米孔（NP）Cu ₅₀ Zr ₅₀的拉伸响应具有3D陀螺结构的金属眼镜（MG）。与纳米多孔晶体金属相似，NP–MG由于韧带的塑性颈缩而失效，但在这些厚韧带样品中存在剪切带（SB）。特别是，当韧带直径减小到2.34 nm时，由于剪切转变区的平移限制，几乎未观察到SB，从而使NP-MG具有出色的强度和延展性。抑制SB形成的临界韧带大小比MG中的计算值小得多。观察结果揭示了一种设计策略，即通过设计超纳米尺寸的3D纳米多孔结构，可以同时获得高强度和延展性。提出了杨氏模量和强度随相对密度和韧带直径变化的比例定律，