Three-Dimensional High-Entropy Alloy–Polymer Composite Nanolattices That Overcome the Strength–Recoverability Trade-off

Zhang, Xuan; Yao, Jiahao; Liu, Bin; Yan, Jun; Lü, Lei; Li, Yang; Gao, Huajian; Li, Xiaoyan

doi:10.1021/acs.nanolett.8b01241

Cited by 129 publications

(93 citation statements)

References 32 publications

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“…Lattice based meta-materials, made up of beam elements, have been traditionally classed as either bending or stretching dominated depending on their connectivity 44 . It is notable that recent experimental work has estabilished that some 3 dimensional lightweight nanolattices exhibit density scaling that is inconsistent with these classifications [65][66][67] . Here we have established, through theory and simulation, the existence of a third class of lattice architecture where both bending and stretching energies must be considered.…”

mentioning

confidence: 99%

Density scaling in the mechanics of a disordered mechanical meta-material

Rayneau-Kirkhope

Bonfanti

Zapperi

2019

Applied Physics Letters

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Nature provides examples of self-assemble lightweight disordered network structures with remarkable mechanical properties which are desirable for many applications purposes but challenging to reproduce artificially. Previous experimental and computational studies investigated the mechanical responses of random network structures focusing on topological and geometrical aspects in terms of variable connectivity or probability to place beam elements. However for practical purposes an ambitious challenge is to design new materials with the possibility to taylor their mechanical features such as stiffness. Here, we design a two dimensional disordered mechanical meta-material exhibiting unconventional stiffness-density scaling in the regime where both bending and stretching are relevant for deformation. In this regime, the mechanical meta-material covers a wide interval of the Young modulus -density plane, simultaneously exhibiting high critical stress and critical strain. Our results, supported by finite element simulations, provides the guiding principles to design on demand disordered metamaterials, bridging the gap between artificial and naturally occurring materials.The mechanical properties of lattice materials of many types, such as foams 1 , cellular solids 2-4 , microlattices 5 , trusses 6 , made of connected elements, have been intensively studied mainly due to their lightweight structures and remarkable mechanical properties 7,8 . The high strength to weight ratio of bone 9,10 or balsa 11 , the elastic properties of spider silk 12,13 and the fracture resistance of nacre 14,15 are just few of the naturally occurring structures that derive their mechanical properties from their underlying geometry. These types of materials attract growing interest in many fields ranging from commercial products such as those related to food industry, to architectural applications such as energy absorption and management 1 and in modern technologies where their geometrical features are exploited to achieve a myriade of performances.In the recent years composite structures started to be rationally architected with the aim to achieve targeted properties 16 , and emerging significant breakthroughs 17 are favoured alongside with the advances in digital manufacturing technologies i.e. 3D printing and automated assembly. Artificially designed materials are recently termed meta-materials 18-22 , specifically, mechanical meta-materials indicate a class of structures whose mechanical properties are a consequence of their underlying geometry rather than their constituent material 23-25 . Through the prudent choice of a meta-materials underlying architecture, it is possible to create geometries whose structural performance far exceeds that of the material from which it is made 24 . These structures can be designed to exhibit a wide range of beneficial properties, including high strength to weight ratio 26,27 , auxetic behaviour 16,28-30 , energy trapping 20,31 and fracture resistance 32,33 , among many others 23 .Typically artificil meta-...

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confidence: 99%

Density scaling in the mechanics of a disordered mechanical meta-material

Rayneau-Kirkhope

Bonfanti

Zapperi

2019

Applied Physics Letters

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“…The main advantage of TPL is that it has the highest precision of current 3D AM techniques, but its scalability and efficiency limit its industrial applications. TPL has been used to fabricate various nanolattices with the minimum characteristic size of hundreds of nanometers and the overall size varying from hundreds of micrometers to several centimeters.…”

Section: Fabricationmentioning

confidence: 99%

“…In this sense, most previous studies have mainly focused on improving or tuning the mechanical properties by adopting the principles of flaw insensitivity and size‐strengthening effects. Thus, 3D micro‐/nanolattices have achieved unprecedented mechanical properties, including ultralightweights with 99.9% air but ultrahigh stiffnesses, large deformabilities and recoverabilities, and ultrahigh specific strengths that approach the theoretical limits . In parallel, other studies have been devoted to the design and optimization of novel structures.…”

Section: Introductionmentioning

confidence: 99%

Design, Fabrication, and Mechanics of 3D Micro‐/Nanolattices

Zhang

Wang

Ding

et al. 2019

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Over the past several decades, lattice materials have been developed and used as engineering materials for lightweight and stiff industrial structures. Recent advances in additive manufacturing techniques have prompted the emergence of architected materials with minimum characteristic sizes ranging from several micrometers to hundreds of nanometers. Taking advantage of the topological design, structural optimization, and size effects of nanomaterials, various 3D micro‐/nanolattice materials composed of different materials exhibit combinations of superior mechanical properties, such as low density, high strength (even approaching the theoretical limits), large deformability, good recoverability, and flaw tolerance. As a result, some micro‐/nanolattices occupy an unprecedented area in Ashby charts with a combination of different material properties. Here, recent advances in the fabrication and mechanics of micro‐/nanolattices are described. First, various design principles and advanced techniques used for the fabrication of micro‐/nanolattices are summarized. Then, the mechanical behaviors and properties of micro‐/nanolattices are further described, including the compressive Young's modulus, strength, energy absorption, recoverability, and tensile behavior, with an emphasis on mechanistic insights and origins. Finally, the main challenges in the fabrication and mechanics of micro‐/nanolattices are addressed and an outlook for further investigations and potential applications of micro‐/nanolattices in the future is provided.

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“…Authors concluded that the concept of hierarchical design can be applied to create materials of any order which offer high strength to weight ratio, negative poisons ratio, near infinite bulk to shear modulus ratios. However, the unique properties of micro-lattices such as high specific modulus, specific strength and energy absorption are restricted by the strength-recoverability compromise [41]. To overcome this strength-recoverability trade-off, Zhang et al fabricated threedimensional architected nanolattices from composites.…”

Section: Structural Applications Of Micro-lattice Materialsmentioning

confidence: 99%

“…To overcome this strength-recoverability trade-off, Zhang et al fabricated threedimensional architected nanolattices from composites. The polymer nanolattices are fabricated by twophoton lithography and coating of high entropy alloy is performed by magnetron sputtering [41]. Scanning electron microscope images of the compression tests performed on these nanolattices have shown that these nanolattices show a high specific strength and high energy absorption capability per unit volume.…”

Section: Structural Applications Of Micro-lattice Materialsmentioning

confidence: 99%

Applications, Manufacturing and Thermal Characteristics of Micro-Lattice Structures: Current State of the Art

Sur¹,

Narkhede²,

Darvekar³

2019

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Micro-lattice structures are emerging as multi-functional devices. They possess excellent heat transfer capabilities, energy absorption abilities, vibration control abilities, etc. The higher surface area to volume ratio of micro-lattice structures makes them suitable for heat transfer applications where compact and lightweight heat transfer mechanism is necessary such as in case of space and transportation. The heat transfer and mechanical load-bearing properties of micro-lattice structures can be tailored by altering several parameters such as the lattice strut angle, node-to-node spacing, the diameter of the strut, etc. In this paper, micro-lattice structures, their manufacturing methods, applications are reviewed and a passive heat transfer mechanism consisting of micro-lattice heat pipe is proposed for the battery thermal management system in electric vehicles.

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Three-Dimensional High-Entropy Alloy–Polymer Composite Nanolattices That Overcome the Strength–Recoverability Trade-off

Cited by 129 publications

References 32 publications

Density scaling in the mechanics of a disordered mechanical meta-material

Density scaling in the mechanics of a disordered mechanical meta-material

Design, Fabrication, and Mechanics of 3D Micro‐/Nanolattices

Applications, Manufacturing and Thermal Characteristics of Micro-Lattice Structures: Current State of the Art

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