Metallic glass-based chiral nanolattice: Light weight, auxeticity, and superior mechanical properties
Metallic glass-based chiral nanolattice: Light weight, auxeticity, and superior mechanical properties
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DOI：
10.1016/j.mattod.2017.10.001
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发表时间：
2017-12-01
期刊：
影响因子：
24.2
通讯作者：
Gao, H. J.
中科院分区：
文献类型：
--
作者：
Sha, Z. D.;She, C. M.;Gao, H. J.
金属玻璃（MG）具有大的弹性极限和高的强度，但不幸的是，由于其宏观脆性性质，它们的商业用途受到限制。在这里，我们报告说，手性纳米晶格可用于设计大规模的MG负泊松比，大的弹性变形能力，广泛的硬化，和大的延展性。此外，金属玻璃手性纳米晶格（MGCN）的力学行为可以通过改变纳米晶格中韧带的厚度和长度而显著改变。对于具有薄且长的韧带的MGCN，观察到高强度和延展性的异常组合，其中样品密度仅为水的两倍。表征手征拓扑结构的变形机制是节点的旋转与韧带的弯曲和伸展的组合，从而导致非凡的力学行为。本研究不仅提供了一个潜在的解决方案，以减轻MG的脆性，但也提供了一些指导方针，在设计大规模MG超材料在声学和能量吸收领域的应用前景。
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.