Abstract Metallic glasses (MGs) possess large elastic limit and high strength, but unfortunately they are of limited commercial utility due to their macroscopic brittle nature. Here, we report that a chiral nanolattice can be used to design large-scale MGs with negative Poisson’s ratio, large elastic deformation capability, extensive hardening, and large ductility. Furthermore, the mechanical behaviors of the metallic glass chiral nanolattice (MGCN) can be significantly altered through changing the thickness and length of the ligaments in the nanolattice. An exceptional combination of high strength and ductility is observed for MGCN with thin and long ligaments, wherein the sample density is only twice that of water. The deformation mechanism that characterizes the chiral topology is a combination of rotation of the nodes with bending and extension of the ligaments, leading to the extraordinary mechanical behaviors. The present study not only offers a potential solution to mitigating the brittleness of MGs, but also provides some guidelines in designing large-scale MG meta-materials for prospective applications in the fields of acoustics and energy absorption.

中文翻译：

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金属玻璃基手性纳米晶格：重量轻、拉胀性和优异的机械性能

摘要 金属玻璃（MGs）具有较大的弹性极限和较高的强度，但遗憾的是由于其宏观脆性，其商业用途有限。在这里，我们报告了手性纳米晶格可用于设计具有负泊松比、大弹性变形能力、广泛硬化和大延展性的大型 MG。此外，通过改变纳米晶格中韧带的厚度和长度，可以显着改变金属玻璃手性纳米晶格（MGCN）的力学行为。对于具有细长韧带的 MGCN，观察到高强度和延展性的特殊组合，其中样品密度仅为水的两倍。表征手性拓扑的变形机制是节点旋转与韧带弯曲和伸展的结合，导致非凡的机械行为。本研究不仅为减轻 MGs 的脆性提供了一种潜在的解决方案，而且还为设计大规模 MG​​ 超材料以用于声学和能量吸收领域的前瞻性应用提供了一些指导。