Hollow medium-entropy alloy nanolattices with ultrahigh energy absorption and resilience

Surjadi, James Utama; Feng, Xiaobin; Fan, Rong; Lin, Weitong; Li, Xiaocui; Lü, Yang

doi:10.1038/s41427-021-00306-y

Cited by 35 publications

(23 citation statements)

References 39 publications

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“…Over the past decade, micro-/nanolattices ( 3 – 5 ) with feature sizes of tens of micrometers and below have been created owing to rapid advances in additive manufacturing (AM) techniques. As an emerging class of mechanical metamaterials, micro-/nanolattices exhibit remarkable mechanical properties, such as ultralow density ( 6 – 8 ), high stiffness ( 8 ), high strength ( 9 – 11 ), large deformability ( 12 , 13 ), excellent recoverability ( 11 – 14 ), supersonic impact resilience ( 15 ), and tunable acoustic bandgaps ( 16 ), which tremendously extend the accessible material property space. In recent years, increasing effort has been devoted to ultralight, ultrastiff, and ultrastrong micro-/nanolattices.…”

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confidence: 99%

Achieving the theoretical limit of strength in shell-based carbon nanolattices

Wang

Zhang

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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Recent developments in mechanical metamaterials exemplify a new paradigm shift called mechanomaterials, in which mechanical forces and designed geometries are proactively deployed to program material properties at multiple scales. Here, we designed shell-based micro-/nanolattices with I-WP (Schoen’s I-graph–wrapped package) and Neovius minimal surface topologies. Following the designed topologies, polymeric microlattices were fabricated via projection microstereolithography or two-photon lithography, and pyrolytic carbon nanolattices were created through two-photon lithography and subsequent pyrolysis. The shell thickness of created lattice metamaterials varies over three orders of magnitude from a few hundred nanometers to a few hundred micrometers, covering a wider range of relative densities than most plate-based micro-/nanolattices. In situ compression tests showed that the measured modulus and strength of our shell-based micro-/nanolattices with I-WP topology are superior to those of the optimized plate-based lattices with cubic and octet plate unit cells and truss-based lattices. More strikingly, when the density is larger than 0.53 g cm −3 , the strength of shell-based pyrolytic carbon nanolattices with I-WP topology was found to achieve its theoretical limit. In addition, our shell-based carbon nanolattices exhibited an ultrahigh strength of 3.52 GPa, an ultralarge fracture strain of 23%, and an ultrahigh specific strength of 4.42 GPa g −1 cm 3 , surpassing all previous micro-/nanolattices at comparable densities. These unprecedented properties can be attributed to the designed topologies inducing relatively uniform strain energy distributions and avoiding stress concentrations as well as the nanoscale feature size. Our study demonstrates a mechanomaterial route to design and synthesize micro-/nanoarchitected materials.

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confidence: 99%

Achieving the theoretical limit of strength in shell-based carbon nanolattices

Wang

Zhang

et al. 2022

Proc. Natl. Acad. Sci. U.S.A.

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“…In most cases, unfortunately, these properties are substantially in contradictory, i.e., high yield or fracture strength is generally gained at the price of low failure strain, and vice versa, which is well exemplified by bulk ceramics. To tackle this problem, metamaterials have been ushered in through ingenious architectural design and material combination, leading to reasonable compromise and providing higher energy absorption capacity 11 , 12 . For a mechanical metamaterial, its energy absorption capacity is essentially dominated by the material’s properties, including size- and microstructure-induced enhancement, and architectural design 9 , 13 .…”

Section: Introductionmentioning

confidence: 99%

Mechanical metamaterials made of freestanding quasi-BCC nanolattices of gold and copper with ultra-high energy absorption capacity

et al. 2023

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Nanolattices exhibit attractive mechanical properties such as high strength, high specific strength, and high energy absorption. However, at present, such materials cannot achieve effective fusion of the above properties and scalable production, which hinders their applications in energy conversion and other fields. Herein, we report gold and copper quasi-body centered cubic (quasi-BCC) nanolattices with the diameter of the nanobeams as small as 34 nm. We show that the compressive yield strengths of quasi-BCC nanolattices even exceed those of their bulk counterparts, despite their relative densities below 0.5. Simultaneously, these quasi-BCC nanolattices exhibit ultrahigh energy absorption capacities, i.e., 100 ± 6 MJ m−3 for gold quasi-BCC nanolattice and 110 ± 10 MJ m−3 for copper quasi-BCC nanolattice. Finite element simulations and theoretical calculations reveal that the deformation of quasi-BCC nanolattice is dominated by nanobeam bending. And the anomalous energy absorption capacities substantially stem from the synergy of the naturally high mechanical strength and plasticity of metals, the size reduction-induced mechanical enhancement, and the quasi-BCC nanolattice architecture. Since the sample size can be scaled up to macroscale at high efficiency and affordable cost, the quasi-BCC nanolattices with ultrahigh energy absorption capacity reported in this work may find great potentials in heat transfer, electric conduction, catalysis applications.

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“…As a typical sort of architectural material, the performance of a mechanical metamaterial can be effectively regulated through the rational design of the architecture and dimension as well as composition selection. Thus, a variety of prominent functionalities have been achieved including ultrahigh strength-to-density ratio, − great energy absorption capability, − damage tolerance, − recoverability, − etc., which can be barely realized by traditional materials, even if they were reinforced with a strengthening phase to form composites. − In general, mechanical metamaterials are organized by the periodical stacking of unit cells with a dimension range spanning multiple orders of magnitude. This formation manner directly results in the homogeneous internal structure if both the dimension and composition remain constant simultaneously.…”

Section: Introductionmentioning

confidence: 99%

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

Chen

Duan

et al. 2022

ACS Appl. Mater. Interfaces

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Biological materials such as conch shells with crossed-lamellar textures hold impressive mechanical properties due to their capability to realize effective crack control and energy dissipation through the structural synergy of interfacial modulus mismatch and lamellar orientation disparity. Integrating this mechanism with mechanical metamaterial design can not only avoid the catastrophic post-yield stress drop found in traditional architectural materials with uniform lattice structures but also effectively maintain the stress level and improve the energy absorption ability. Herein, a novel bioinspired design strategy that combines regional particularity and overall cyclicity is proposed to innovate the connotation of long-range periodicity inside the metamaterial, in which the node constraint gradient and crossed-lamellar struts corresponding to the core features of conch shells are able to guide the deformation sequence with a self-strengthening response during compression. Detailed in situ experiments and finite element analysis confirm that the rotated broad layer stacking can shorten and impede the shear bands, further transforming the deformation of bioinspired metamaterial into a progressive, hierarchical way, highlighted by the cross-layer hysteresis. Even based on a brittle polymeric resin, excellent specific energy absorption capacity [4544 kJ/kg] has been achieved in this architecture, which far exceeds the reported metal-based syntactic foams for two orders of magnitude. These results offer new opportunities for the bioinspired metamaterials to substitute the widespread syntactic foams in specific applications required for both lightweight and energy absorption.

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Hollow medium-entropy alloy nanolattices with ultrahigh energy absorption and resilience

Cited by 35 publications

References 39 publications

Achieving the theoretical limit of strength in shell-based carbon nanolattices

Achieving the theoretical limit of strength in shell-based carbon nanolattices

Mechanical metamaterials made of freestanding quasi-BCC nanolattices of gold and copper with ultra-high energy absorption capacity

Three Dimensional Printing of Bioinspired Crossed-Lamellar Metamaterials with Superior Toughness for Syntactic Foam Substitution

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