Simultaneously enhancing the ultimate strength and ductility of high-entropy alloys via short-range ordering

Chen, Shuai; Aitken, Zachary H.; Pattamatta, Subrahmanyam; Wu, Zhaoxuan; Yu, Zhi Gen; Srolovitz, David J.; Liaw, Peter K.; Zhang, Yong‐Wei

doi:10.1038/s41467-021-25264-5

Cited by 165 publications

(57 citation statements)

References 55 publications

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“…In this case, the spring exhibits a maximum tensile force, similar to the ultimate tensile strength in the stress‐strain curve for elastic materials. [ 27 ] To explain the divergent spring behaviors for different‐sized patterns, we investigate the origin of the tensile force generated by the droplet‐based spring. The tensile force is the sum of the Laplace pressure F L (related to the droplet‐solid contact area and the contact angle) and the surface tension F S (related to the length of the TCL and the contact angle), [ 28 ] and the latter is dominant.…”

Section: Resultsmentioning

confidence: 99%

Non‐Hookean Droplet Spring for Enhancing Hydropower Harvest

Xue

Liu

et al. 2022

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Nonlinear elastic materials are significant for engineering and micromechanics. Droplets with the merits of easy‐accessibility, diversity, and energy‐absorption capability exhibit a variety of non‐Hookean elastic behaviors. Herein, benefiting from the confinement of heterogeneous‐wettable parallel plates, the non‐Hookean mechanics of the droplet‐based spring are systematically investigated. Experimental results and theoretical analysis reveal that the force generated by the spring varies nonlinearly with its deformation, and a force model is accordingly built to depict the mechanics of springs with different sized/numbered droplets and confined by different wettability patterns. Importantly, for the droplet‐based spring, the droplet‐plate contact area expands nonlinearly with the pressing force, which is employed to optimize the output performance of the droplet‐based triboelectric nanogenerator to 226% compared with the control test. This finding deepens the understanding of the non‐Hookean behavior of droplet‐based springs, and sheds light on applications in energy harvesting, micromechanics, and miniature optic/electric devices.

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Section: Resultsmentioning

confidence: 99%

Non‐Hookean Droplet Spring for Enhancing Hydropower Harvest

Xue

Liu

et al. 2022

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“…[10][11][12][13] Particularly, several recent works have demonstrated that chemical short-range order at a nanometer scale can be created in the HEAs and medium-entropy alloys, which could significantly strengthen their mechanical properties. [14][15][16] However, these research efforts have been mainly focused on the fabrication of bulk HEAs as the structural materials.…”

Section: Introductionmentioning

confidence: 99%

Constructing Structurally Ordered High‐Entropy Alloy Nanoparticles on Nitrogen‐Rich Mesoporous Carbon Nanosheets for High‐Performance Oxygen Reduction

et al. 2022

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Recent efforts have observed nanoscaled chemical short‐range order in bulk high‐entropy alloys (HEAs). Simultaneously inspired with the nanostructuring technology, HEA nanoparticles (NPs) with complete chemical order may be achieved. Herein, structurally ordered HEA (OHEA) NPs are constructed on a novel 2D nitrogen‐rich mesoporous carbon sandwich framework (OHEA‐mNC) by combining a ligand‐assisted interfacial assembly with NH3 annealing. Characterization results show that the resultant materials possess an ultrathin 2D nanosheet structure with large mesopores (≈10 nm), where structurally ordered HEA NPs with an L12 phase are homogeneously dispersed. The atom‐resolved chemical analyses explicitly determine the location of each atomic site. When being evaluated for the oxygen reduction reaction, the OHEA‐mNC NPs afford a greatly enhanced catalytic performance, including a large half‐wave potential (0.90 eV) and a high durability (0.01 V decay after 10 000 cycles) compared with the disordered HEA and commercial Pt/C catalysts. The excellent performance is attributed to the enhanced mass transfer rate, improved electron conductivity, and the presence of the stable chemically ordered HEA phase, as revealed by both the experimental results and theoretical calculation. This study suggests a highly feasible process to achieve structurally ordered HEA NPs with advanced mesoporous function in the electrochemical field.

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“…Here we prepared ferroelastic Zr x Y (1‐ x )/4 Yb (1‐ x )/4 Ta (1‐ x )/4 Nb (1‐ x )/4 O 2 ( x = 0.312 and 0.668) HEOs by the conventional solid‐state reaction method and employed a hybrid MD and Monte Carlo (MC) method as MC is more effective to optimize the random exchange atom occupancy for randomly doped high‐entropy systems 37 . Results show the ferroelastic HEOs present glass‐like low‐ k approaching the amorphous limit ( k min ), which originates from the dominant delocalized phonon modes caused by the disordered interatomic bonding force.…”

Section: Introductionmentioning

confidence: 99%

Thermal conduction mechanism of ferroelastic Zr‐Y‐Yb‐Ta‐Nb‐O high‐entropy oxides with glass‐like thermal conductivity

Yao

Ren

et al. 2022

J Am Ceram Soc.

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Ferroelastic high‐entropy oxides (HEOs) with high fracture toughness and low thermal conductivity are promising topcoat materials for next‐generation thermal barrier coatings (TBCs). However, phonon transmission characteristics in the ferroelastic HEOs are less well understood due to their complicated and highly‐disordered structure. Here we prepared two types of ferroelastic Zr‐Y‐Yb‐Ta‐Nb‐O HEOs and investigated their thermal conduction behaviors at 100–900°C. Hybrid Monte Carlo and molecular dynamic simulations were employed to understand the thermal conduction mechanism in this high‐entropy system. Results show the HEOs present glass‐like, low thermal conductivity (< 1.30 W m–1 K–1 at 100°C), which is attributed to the diffused lattice vibration mode with random polarization distribution. Dominant delocalized phonon modes in the HEOs are beneficial to strengthening phonon scattering and consequently decrease the thermal conductivity significantly. Lower thermal conductivity can be achieved by tailoring the composition and crystal structure of the HEOs to increase the contribution from diffused lattice vibration and “diffusion”. This work provides a fundamental insight into the thermal conduction mechanisms of HEOs, which may facilitate materials design of low thermal conductivity materials for TBCs applications.

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Simultaneously enhancing the ultimate strength and ductility of high-entropy alloys via short-range ordering

Cited by 165 publications

References 55 publications

Non‐Hookean Droplet Spring for Enhancing Hydropower Harvest

Non‐Hookean Droplet Spring for Enhancing Hydropower Harvest

Constructing Structurally Ordered High‐Entropy Alloy Nanoparticles on Nitrogen‐Rich Mesoporous Carbon Nanosheets for High‐Performance Oxygen Reduction

Thermal conduction mechanism of ferroelastic Zr‐Y‐Yb‐Ta‐Nb‐O high‐entropy oxides with glass‐like thermal conductivity

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