Acta Materialia最新文献_第5页

Quantifying yield anisotropy to engineer elasto-plastic isotropic mechanical metamaterials 量化工程弹塑性各向同性机械材料的屈服各向异性

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-05 DOI: 10.1016/j.actamat.2025.121810

Ming Lei , Weibin Wen , Shengyu Duan , Jun Liang

Current research on the anisotropy of mechanical metamaterials primarily focuses on the elastic properties. However, complex multiaxial loading environments in practical engineering applications demand improved isotropy in plastic properties. Traditional lattice materials often exhibit significant anisotropy in elasticity, yield strength and energy absorption. The hollow truss-stellated plate (HTSP) hybrid mechanical metamaterials with elasto-plastic isotropy are proposed in this study. The theoretical models for predicting the yield strength based on the multiaxial stress states and the extended Hill (E-H) anisotropic yield criterion are developed, and the novel yield anisotropy index is further proposed. The results demonstrate that the proposed yield anisotropy index realizes the effective quantification of the orientational dependence of the yield strength of lattice materials. Compression experiments are carried out on the HTSP lattice specimens, which indicate that they exhibit highly consistent elasto-plastic mechanical properties of different orientations. The HTSP lattices exhibit both elastic isotropy and nearly isotropy in yield strength and energy absorption, with performance deviations of all orientations controlled within 10%. Compared with most porous materials, particularly other isotropic lattice materials, the HTSP lattices exhibit significant advantages in energy absorption. This unique combination of nearly isotropic mechanical properties, high energy absorption and low stress fluctuations makes the HTSP lattices highly promising for applications in complex service environments, such as multi-directional impact load protection. The proposed theoretical model for yield strength prediction and the yield anisotropy index offer a theoretical foundation and a quantitative tool for designing novel isotropic mechanical metamaterials.

目前对机械材料各向异性的研究主要集中在弹性性能方面。然而，在实际工程应用中，复杂的多轴加载环境要求提高塑性性能的各向同性。传统的点阵材料在弹性、屈服强度和能量吸收方面往往表现出明显的各向异性。提出了具有弹塑性各向同性的中空桁架-星状板（HTSP）复合力学材料。建立了基于多轴应力状态和扩展的Hill （E-H）各向异性屈服准则的屈服强度预测理论模型，并进一步提出了新的屈服各向异性指数。结果表明，所提出的屈服各向异性指数实现了晶格材料屈服强度取向依赖性的有效量化。对HTSP晶格试样进行了压缩实验，结果表明，不同取向的HTSP晶格试样具有高度一致的弹塑性力学性能。HTSP晶格在屈服强度和吸能方面表现出弹性各向同性和近各向同性，各取向性能偏差控制在10%以内。与大多数多孔材料，特别是其他各向同性晶格材料相比，HTSP晶格在能量吸收方面具有显著的优势。这种近乎各向同性的机械性能、高能量吸收和低应力波动的独特组合，使HTSP晶格在复杂的服务环境（如多向冲击载荷保护）中应用前景广阔。提出的屈服强度预测理论模型和屈服各向异性指数为设计新型各向同性力学超材料提供了理论基础和定量工具。

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引用次数: 0

Novel core-shell structure Co2P/Fe2P@C@NC as advanced cathode for aluminum batteries 新型芯壳结构Co2P/Fe2P@C@NC作为铝电池的高级正极

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-05 DOI: 10.1016/j.actamat.2025.121811

Wenbin Luo , Jian Li , Yi Yu , Dingrui Xiao , Zisheng Chao , JinCheng Fan

In this manuscript, we designed a novel cathode for aluminum batteries by encapsulating Co₂P/Fe₂P heterostructures and uniformly distributed amorphous carbon in a nitrogen-doped carbon shell with a hollow cubic structure. The uniformly distributed amorphous carbon in the inner core and the N-doped carbon layer in the outer shell, in addition to improving the conductivity of the material, also minimize cyclic stress and keep the material structure from being damaged and collapsed. The Co₂P/Fe₂P rich heterojunction forms a built-in electric field to achieve fast transport of electrons/ions. The electrochemical performance of the material is significantly improved through the dual-carbon synergistic structural and interface design strategy. Co₂P/Fe₂P@C@NC exhibits an initial capacity of 289 mAh/g, which stabilizes at 209 mAh/g after 200 cycles, while maintaining near-100% CE and representing a discharge capacity of 105 mAh/g even at 2 A/g. DFT calculations reveal that the Co₂P/Fe₂P@C@NC heterojunction possesses superior Al³⁺ ion diffusion capabilities and significantly enhances the kinetics of electrochemical reactions.

本文通过将Co2P/Fe2P异质结构和均匀分布的非晶碳包裹在一个空心立方结构的氮掺杂碳壳中，设计了一种新型的铝电池阴极。内核中均匀分布的无定形碳和外壳中的n掺杂碳层，除了提高材料的导电性外，还使循环应力最小化，使材料结构不被破坏和坍塌。富Co2P/Fe2P异质结形成内置电场，实现电子/离子的快速输运。通过双碳协同结构和界面设计策略，显著提高了材料的电化学性能。Co2P/Fe2P@C@NC的初始容量为289 mAh/g，经过200次循环后稳定在209 mAh/g，同时保持接近100%的CE，即使在2a /g下也具有105 mAh/g的放电容量。DFT计算表明，Co2P/Fe2P@C@NC异质结具有优异的Al3+离子扩散能力，显著提高了电化学反应动力学。

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引用次数: 0

Influence of co ion valence states on lattice structure and remanence in La–Co doped M–type Sr ferrite Co离子价态对La-Co掺杂m型Sr铁氧体晶格结构和剩余物质的影响

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121805

Kanglin Tang, Lingxi Huang, Haoran Chen, Yuhan Zhang, Dapeng Zhu, Rongzhi Zhao, Xuefeng Zhang

La–co–doping is known to effectively enhance the coercivity (H_cj) and remanence (B_r) of Sr hexaferrites, yet the precise role of Co ion valence in regulating lattice site occupancy—and its subsequent impact on B_r—remains underexplored. Addressing this gap could unlock new strategies for optimizing B_r in permanent magnet ferrites. Herein, we clarify that Co valence modulates magnetic properties: Co²⁺-doped samples achieve the highest Bᵣ (3.21 kGs), exceeding Co³⁺-doped and undoped ones. This aligns with (0001) plane lattice expansion, where Co²⁺ induces greater expansion than Co³⁺-doped as well as the undoped baseline. Combined experimental characterization and first–principles calculations confirm a critical mechanism: Co²⁺ preferentially occupies the tetrahedrally coordinated 4f₁ site, while Co³⁺ tends to substitute at the octahedrally coordinated 4f₂ site. Co doping also increases La solubility, consequently favoring single magnetic domains and yielding an enhanced H_cj (3.87 kOe). This study provides a new insight for the design of high–performance permanent magnet ferrites.

已知La-Co共掺杂可以有效地增强Sr六铁体的矫顽力（Hcj）和剩余物（Br），但Co离子价在调节晶格位占用中的确切作用及其对Br的后续影响仍未得到充分研究。解决这一差距可以为优化永磁铁氧体中的Br提供新的策略。在此，我们阐明了Co价调制磁性能：Co2+掺杂样品达到最高的Bᵣ（3.21 kGs），超过了Co3+掺杂和未掺杂的样品。这与（0001）平面晶格膨胀一致，其中Co2+诱导的膨胀比Co3+掺杂和未掺杂的基线更大。结合实验表征和第一性原理计算证实了一个关键机制：Co2+优先占据四面体配位的4f1位点，而Co3+倾向于替代八面体配位的4f2位点。Co掺杂也增加了La的溶解度，从而有利于单磁畴并产生增强的Hcj （3.87 kOe）。该研究为高性能永磁铁氧体的设计提供了新的思路。

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引用次数: 0

A dual-bioinspired laminated approach enables high thermal conductivity and superior toughness in zero-thermal-expansion copper composites 双生物激励层压方法使零热膨胀铜复合材料具有高导热性和优越的韧性

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121799

Buke Dong , Xuekai Zhang , Saichao Cao , Jianchao Lin , Jiawei Zeng , Keke Liu , Zhijian Tan , Jie Chen , Wenhai Song , Yuping Sun , Peng Tong

Zero-thermal-expansion (ZTE) materials are crucial to precision optics, cryogenics, and aerospace applications. By homogeneously filling metals with negative thermal expansion (NTE) particles, ZTE composites can be created. However, this uniform approach significantly diminishes the exceptional thermal and mechanical properties of the metals. Learning from the biological structures of abalone nacre and bamboo inner membranes, we developed a novel ZTE composite constructed by alternating copper foil layers and copper layers reinforced with NTE particles (ZSM/Cu_p). The copper foil layers act as pathways for heat transfer, achieving a high directional thermal conductivity of 200 Wm^-1K^-1 for a laminated composite with 100 μm-thick copper foil layers (i.e., 100Cu-ZSM/Cu_p). Furthermore, the Cu layers help mitigate stress concentration and hinder crack propagation, effectively dissipating substantial fractural energy. The thermal conductivity and toughness of the 100Cu-ZSM/Cu_p composite are tripled and fourfold, respectively, compared with those of its homogeneous counterpart. The thermal stress generated by the adjacent layers via the semi-coherent interface compensates for each layer’s intrinsic expansion/shrinkage. This causes ZTE perpendicular to the lay-up direction, leading to an isotropic ZTE in the laminated composites. This work would expand the potential applications of ZTE materials, especially in challenging environments where thermal and mechanical shocks are prevalent.

零热膨胀（ZTE）材料对精密光学、低温学和航空航天应用至关重要。通过在金属中均匀填充n…

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引用次数: 0

Prediction on the photocatalytic properties of Bi/TeM (M=In, Ga) heterostructures by first principle calculation 用第一性原理计算预测Bi/TeM （M=In, Ga）异质结构的光催化性能

IF 9.4 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121804

Ruyang Yan, Huanming Chen, Dongxin Wang, Xiaobo Ma, Fuli He, Hongsheng Zhao, Nan Zhang, Xumin Yang, Cong Yan, Yuqi Wang

Under the urgent demand for global energy transition and sustainable development, hydrogen production via water splitting is important in clean energy conversion and has thus attracted extensive research attention. In this work, the photocatalytic properties of Bi/TeM (M=In, Ga) heterostructures are predicted based upon stability evaluation, electronic structure analysis and optical properties calculation by DFT method. The externally electric field and applied strain taking on band structure and optical properties of Bi/TeM (M=In, Ga) has also been calculated. The results imply that both Bi/TeIn and Bi/TeGa are type II vdWs heterostructures with 0.5119eV and 0.3180eV band gap respectively. The Z–type band edge alignment makes the CBM of Bi and VBM of TeM straddle over the required water splitting redox potential. The formation of electronic accumulation and depletion area has established 3.228eV (Bi/TeIn) and 3.676eV (Bi/TeGa) potential difference between the Bi and TeM layers, enabling carriers being separated effectively. The calculation of carrier mobility indicates that the electrons migrate along positive x or y direction while the holes migrate along negative x or y direction. This migration characteristic is highly beneficial for enhancing the utilization of carriers significantly and promoting the efficiency of photocatalysis. Coupling with excellent optical absorption properties, very low e–h binding energy and exceptional migration characteristic, the efficiency of water splitting for hydrogen production of Bi/TeIn and Bi/TeGa is analyzed as high as 46.34% and 54.07% respectively.

在全球能源转型和可持续发展的迫切需求下，水裂解制氢是清洁能源转化的重要途径，受到了广泛的研究关注。本文基于稳定性评价、电子结构分析和DFT光学性质计算，对Bi/TeM （M=In, Ga）异质结构的光催化性能进行了预测。计算了外电场和外加应变对Bi/TeM （M=In, Ga）能带结构和光学性质的影响。结果表明，Bi/TeIn和Bi/TeGa均为II型vdWs异质结构，带隙分别为0.5119eV和0.3180eV。z型带边缘排列使得Bi的CBM和TeM的VBM跨越所需的水分裂氧化还原电位。电子积累和耗损区的形成使Bi层和TeM层之间形成了3.228eV （Bi/TeIn）和3.676eV （Bi/TeGa）的电位差，使载流子有效分离。载流子迁移率计算表明，电子沿正x或y方向迁移，空穴沿负x或y方向迁移。这种迁移特性对于显著提高载流子的利用率和提高光催化效率非常有利。结合优异的光学吸收性能、极低的e-h结合能和优异的迁移特性，Bi/TeIn和Bi/TeGa的水裂解制氢效率分别高达46.34%和54.07%。

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引用次数: 0

Ag7.23SnS5.44I0.50 - a new argyrodite-like conductor with promising optical and electrical performance Ag7.23SnS5.44I0.50 -一种具有良好光学和电学性能的新型类银钛导体

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121803

Artem Pogodin , Mykhailo Filep , Iryna Shender , Mykhailo Pop , Tetyana Malakhovska , Stepan Milyovich , Vitalii Izai , Oleksandr Kokhan

A novel compound, identified as Ag_7.23SnS_5.44I_0.50 and characterized by an argyrodite structure, has been synthesized and studied in detail by several experimental techniques. The phase homogeneity and composition of the crystal were determined using SEM and EDS methods. Ag_7.23SnS_5.44I_0.50 crystallizes in cubic face-centered SG F-43m with a lattice parameter a = 10.80685(3) Å, Z = 4. Spectral ellipsometry was used to reveal the refractive index and extinction coefficient characteristics. The dispersion of the refractive index was described using the Wempl-DiDomenico model. The optical transmittance was studied in over a broad spectral range (400–1100 nm) between 77 and 300 K. It has been established, that the spectral dependence of the absorption coefficient α has an exponential form and obeys the Urbach rule at all studied temperatures. One convergence point was detected, indicating that the Ag_7.23SnS_5.44I_0.50 crystal does not undergo phase transitions. The temperature dependence of the pseudogap E_g* = 1.58 eV (77 K) - 1.43 eV (300 K) and the Urbach energy E_U = 28.30 (77 K) meV - 38.52 meV (300 K) was determined. The frequency dependence of the total electrical conductivity is typical for solid state ionic conductors. The values of ionic (σ_ion = 4.33 × 10⁻² S/cm, E_a = 0.137 eV) and electronic (σ_el = 1.52 × 10⁻⁴ S/cm, E_a = 0.947 eV) conductivity, as well as the corresponding activation energies have been determined. The analysis of structural parameters leads to the proposal of a mechanism of ionic transport for the Ag_7.23SnS_5.44I_0.50 single crystal.

合成了一种具有银柱石结构的新化合物Ag7.23SnS5.44I0.50，并通过多种实验技术对其进行了详细的研究。利用扫描电镜和能谱仪分析了晶体的相均匀性和组成。Ag7.23SnS5.44I0.50在立方面心SG F-43m中结晶，晶格参数为a = 10.80685(3)Å， Z = 4。利用椭偏光谱法分析了折射率和消光系数的特性。折射率的色散用wemple - didomenico模型描述。在77 ~ 300 K的宽光谱范围内（400 ~ 1100nm）研究了其透光率。结果表明，在所有研究温度下，吸收系数α的光谱依赖关系呈指数形式，且服从乌尔巴赫规则。发现了一个收敛点，表明Ag7.23SnS5.44I0.50晶体没有发生相变。测定了赝隙Eg* =1.58 eV (77 K) ~ 1.43 eV （300 K）和乌尔巴赫能EU = 28.30 (77 K) meV ~ 38.52 meV （300 K）的温度依赖性。总电导率的频率依赖性是固态离子导体的典型特征。离子的值(σ离子 = 4.33  × 10−2 S /厘米,Ea = 0.137 eV)和电子(el σ= 1.52 × 10−4 S /厘米,Ea = 0.947 eV)导电性,以及相应的激活能量已经确定。通过对结构参数的分析，提出了Ag7.23SnS5.44I0.50单晶的离子输运机制。

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引用次数: 0

Effects of alloying elements on the hydrogen solubility in α-Fe and their electronic origins: An experimental and DFT study 合金元素对α-Fe中氢溶解度的影响及其电子来源：实验和DFT研究

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121807

Kazuma Ito , Tomohiko Omura , Ayaka Udagawa , Kenichi Takai

Mitigating hydrogen embrittlement in ferritic steels is essential for achieving carbon neutrality and requires a quantitative understanding of the influence of alloying elements on hydrogen solubility. However, experimental assessments are limited by the extremely low solubility of hydrogen in α-Fe. In this study, we address this issue by combining experiments with first-principles calculations. α-Fe model alloys containing Al, Si, or Ti near their solubility limits were hydrogen-charged via cathodic electrolysis, and hydrogen concentrations were measured using semiconductor-type gas chromatography. A first-principles-based model was subsequently developed and its validity was evaluated using the experimental results. This model enabled the systematic evaluation of the effects of 12 other typical alloying elements (Al, Si, P, Ti, V, Cr, Co, Ni, Cu, Nb, Mo, and W) on the solubility of hydrogen in hydrogen-gas environments. Ti markedly increased hydrogen solubility, whereas Si reduced it at higher concentrations; the trends for both elements were consistent with the experimental results. Elucidation of the underlying mechanisms at the atomic and electronic scales revealed that even lattice sites distant from solute atoms, which were previously considered negligible, significantly influenced hydrogen solubility by inducing changes in lattice expansion and local strain. This study provides a predictive framework and fundamental insights into the design of metallic materials for use in hydrogen-rich environments.

减轻铁素体钢中的氢脆对于实现碳中和至关重要，并且需要定量了解合金元素对氢溶解度的影响。然而，由于氢在α-Fe中的溶解度极低，实验评价受到限制。在本研究中，我们通过结合实验和第一性原理计算来解决这个问题。α-Fe模型合金中含有接近溶解度极限的Al、Si或Ti，通过阴极电解对其充氢，并采用半导体型气相色谱法测定氢浓度。随后建立了基于第一性原理的模型，并用实验结果对其有效性进行了评估。该模型能够系统评价其他12种典型合金元素（Al、Si、P、Ti、V、Cr、Co、Ni、Cu、Nb、Mo和W）对氢气环境中氢溶解度的影响。Ti显著提高氢溶解度，而Si则在较高浓度下降低氢溶解度；这两种元素的变化趋势与实验结果一致。在原子和电子尺度上对潜在机制的阐释表明，即使是远离溶质原子的晶格位点（以前被认为可以忽略不计）也会通过诱导晶格膨胀和局部应变的变化而显著影响氢的溶解度。这项研究为富氢环境中使用的金属材料的设计提供了一个预测框架和基本见解。

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引用次数: 0

Thermally activated migrating boundary-induced plasticity: Mechanistic and predictive framework across atomistic-to-macroscopic scales 热激活迁移边界诱导塑性：跨越原子到宏观尺度的机制和预测框架

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-04 DOI: 10.1016/j.actamat.2025.121806

Simoon Sung , Dongin Choi , Kyeongjae Jeong , Heung Nam Han

Migrating boundary-induced plasticity (MBIP) is identified as a previously under-recognized high-temperature deformation mechanism in polycrystalline metals, driven solely by grain boundary (GB) migration under sub-yield stresses. This study combines molecular dynamics simulations with high-temperature strain measurements on Ti and Fe to directly quantify MBIP and elucidate its underlying physics. MBIP strain develops rapidly during the early stage of GB migration, then continues to accumulate at a reduced but steady rate. Higher temperatures markedly accelerate GB migration, producing larger final grain sizes and greater total strain. A newly developed constitutive model, extending the Coble creep framework to incorporate GB migration velocity, accurately captures MBIP strain rates across a range of temperatures and applied stresses. The model enables the determination of the final grain size and the activation energy for vacancy formation at GBs, thus overcoming the experimental challenge of real-time stagnation tracking. The estimated activation energies are substantially lower than bulk vacancy-formation energies, confirming that MBIP is governed by vacancy diffusion along migrating GBs rather than by lattice diffusion. These findings establish MBIP as a thermally activated, GB-mediated process distinct from dislocation creep, diffusional creep, and GB sliding. The proposed MBIP model may serve as a predictive framework for assessing the long-term stability and service life of polycrystalline structural metals, particularly under the high-temperature conditions where GB migration is active.

迁移边界诱导塑性（MBIP）是一种以前未被认识到的多晶金属高温变形机制，仅由亚屈服应力下的晶界迁移（GB）驱动。本研究将分子动力学模拟与Ti和Fe的高温应变测量相结合，直接量化MBIP并阐明其潜在的物理特性。MBIP菌株在GB迁移的早期发展迅速，然后以缓慢但稳定的速度继续积累。较高的温度显著加速GB迁移，产生更大的最终晶粒尺寸和更大的总应变。一个新开发的本构模型，扩展了Coble蠕变框架，以纳入GB迁移速度，准确地捕获了温度和施加应力范围内的MBIP应变率。该模型能够确定GBs空位形成的最终晶粒尺寸和活化能，从而克服了实时停滞跟踪的实验挑战。估计的活化能大大低于总体空位形成能，证实了MBIP是由空位沿迁移的GBs扩散而不是晶格扩散控制的。这些发现表明MBIP是一种热激活的、GB介导的过程，不同于位错蠕变、扩散蠕变和GB滑动。提出的MBIP模型可以作为评估多晶结构金属的长期稳定性和使用寿命的预测框架，特别是在GB迁移活跃的高温条件下。

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引用次数: 0

Stabilizing manganese-based prussian blue analogs via high-medium-entropy gradient design for durable aqueous zinc-ion batteries 通过高中熵梯度设计稳定锰基普鲁士蓝类似物用于耐用水性锌离子电池

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-03 DOI: 10.1016/j.actamat.2025.121802

Peng Wang , Zi Wen , Hong Zhang , Yang Shang , Ke Lu , Chun Cheng Yang , Qing Jiang

Multi-metal doping activates synergistic redox centers in high-entropy prussian blue analogues (HE-PBAs), with Mn incorporation significantly enhancing both working voltage and discharge capacity. However, the Mn redox process often triggers Jahn-Teller distortion, causing uncontrollable cathodic degradation. Herein, we propose entropy-gradient engineering via core-shell architectural design, where a medium-entropy FeCoNiCu-PBA shell encapsulates a Mn-rich high-entropy core, enhancing structural robustness and unlocking full theoretical potential. This architecture is precisely fabricated by confined microfluidic synthesis, which establishes a uniform reaction environment and regulates sequential metal nucleation via coordinated ligand competition, enabling spatial separation and ordered crystallization. Crystal field perturbations and d-orbital coupling in the core effectively reduce Mn³⁺ e_g orbital degeneracy and mitigate distortion, whereas the core-shell adsorption energy difference facilitates graded Zn²⁺ insertion/extraction and lowers ion migration barriers. The medium-entropy shell broadens the energy-level distribution, accelerating electron transport and interfacial kinetics, and simultaneously buffering internal stress to suppress Mn-N bond rupture and framework collapse. Consequently, this cathode delivers a high capacity of 123 mAh g^-1, exceptional cycling stability over 6000 cycles with an ultralow fading rate of 0.004 % per cycle, and an energy density of 171 Wh kg^-1 in zinc-ion pouch cell, demonstrating outstanding cycling durability and practical viability.

多金属掺杂激活了高熵普鲁士蓝类似物（HE-PBAs）的协同氧化还原中心，Mn的掺入显著提高了工作电压和放电容量。然而，锰的氧化还原过程往往会引发姜-泰勒扭曲，导致不可控的阴极降解。在此，我们提出了通过核壳结构设计的熵梯度工程，其中中熵FeCoNiCu-PBA壳封装了富锰的高熵核，增强了结构的鲁棒性并释放了充分的理论潜力。这种结构是由受限微流控合成精确制造的，它建立了一个均匀的反应环境，并通过配体的协调竞争调节顺序金属成核，实现了空间分离和有序结晶。晶体场扰动和d轨道耦合有效地降低了Mn3+ eg轨道简并并减轻了畸变，而核壳吸附能差有利于Zn2+的梯度插入/提取，降低了离子迁移障碍。中熵壳层拓宽了能级分布，加速了电子传递和界面动力学，同时缓冲了内应力，抑制了Mn-N键断裂和框架坍塌。因此，该阴极提供了123 mAh g-1的高容量，在6000次循环中具有出色的循环稳定性，每个循环的超低衰减率为0.004%，锌离子袋电池的能量密度为171 Wh kg-1，展示了出色的循环耐久性和实际可行性。

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引用次数: 0

Improving creep resistance of a Ni-based single crystal superalloy by interfacial strengthening via heat treatment 热处理界面强化提高镍基单晶高温合金的抗蠕变性能

IF 9.3 1区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Acta Materialia

Pub Date : 2025-12-03 DOI: 10.1016/j.actamat.2025.121800

Xiaoyi Yuan , Junbo Zhao , Yunsong Zhao , Haibo Long , Yinong Liu , Shengcheng Mao , Lihua Wang , Ze Zhang , Xiaodong Han

This study explores a novel heat treatment process to encourage γ/γʹ interface chemical segregation in a Ni-based single crystal superalloy and investigates the influence of such segregation on the creep life of the alloy. It was found that the specially designed heat treatment process is able to induce Co, Cr and Re segregation at the γ/γʹ interface without affecting the cuboidal morphology of the γʹ phase. As a result, the alloy demonstrates much improved creep resistance, with a creep life improvement by 238 % when tested at 760 °C/800 MPa. The segregation is also found to reduce dislocation mobility and to slows the γʹ phase coarsening rate. With temperature rising, the formation of rafted structures may attenuate these benefits, leading to smaller incremental gains. These findings provide new insights for advancing heat treatment optimization in superalloys.

本研究探索了一种促进ni基单晶高温合金γ/γ′界面化学偏析的热处理工艺，并研究了这种偏析对合金蠕变寿命的影响。结果表明，特殊的热处理工艺能够在不影响γ′相立方形貌的情况下诱导Co、Cr和Re在γ′/γ′界面析出。结果表明，该合金的抗蠕变性能得到了显著提高，在760℃/800 MPa下的蠕变寿命提高了238%。偏析还降低了位错迁移率，减缓了γ′相的粗化速率。随着温度的升高，筏状结构的形成可能会削弱这些好处，导致较小的增量收益。这些发现为推进高温合金的热处理优化提供了新的见解。

引用次数: 0