Materials & Design最新文献_第5页

Bioinspired microneedle patch integrating ginger vesicle-silver hybrid nanocomposites with dual antibacterial and angiogenic functions for diabetic wound healing 具有抗菌和血管生成双重功能的姜囊银混合纳米复合材料的仿生微针贴片用于糖尿病伤口愈合

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-13 DOI: 10.1016/j.matdes.2026.115492

Luming Huang , Fei Xue , Yangkai Fu , Chenyu Ma , Qiyue Wang , Hao Ren , Zhengjie Meng

Chronic diabetic wounds represent a major clinical challenge due to biofilm-forming bacterial infections and impaired angiogenesis, which impedes tissue regeneration and leads to poor therapeutic outcomes. In this study, we developed a multifunctional therapeutic microneedle (Ag-GV/MN) that integrates ginger-derived vesicles (GV) with in situ biomineralized silver nanoparticles (AgNPs) for synergistic antibacterial and regenerative therapy to promote wound healing. GV serves as a biocompatible nanocarrier that not only stabilize and uniformly disperse AgNPs but also contribute inherent antioxidant, anti-inflammatory, and pro-angiogenic properties. The resulting Ag-GV nanocomposite effectively disrupts mature biofilms, eliminates methicillin-resistant Staphylococcus aureus (MRSA), and promotes cell migration and vascular regeneration in vitro. When incorporated into a dissolvable microneedle patch, the Ag-GV/MN platform enabled precise, minimally invasive delivery with improved local retention. In a diabetic wound model, this multifunctional Ag-GV/MN significantly reduced bacterial burden, promoted neovascularization and collagen deposition, leading to accelerated wound healing. Overall, this bioactive and antibacterial microneedle platform offers a promising strategy for the treatment of chronic diabetic wounds and have potential for clinical application.

慢性糖尿病伤口是一个主要的临床挑战，因为生物膜形成细菌感染和血管生成受损，这阻碍了组织再生，导致治疗效果不佳。在这项研究中，我们开发了一种多功能治疗微针（Ag-GV/MN），它将姜源性囊泡（GV）与原位生物矿化银纳米粒子（AgNPs）结合在一起，用于协同抗菌和再生治疗，促进伤口愈合。GV作为一种生物相容性纳米载体，不仅稳定和均匀分散AgNPs，而且具有固有的抗氧化、抗炎和促血管生成特性。由此产生的Ag-GV纳米复合材料有效地破坏成熟的生物膜，消除耐甲氧西林金黄色葡萄球菌（MRSA），并促进体外细胞迁移和血管再生。当将Ag-GV/MN平台整合到可溶解的微针贴片中时，Ag-GV/MN平台实现了精确、微创的输送，并改善了局部保留。在糖尿病伤口模型中，这种多功能Ag-GV/MN显著减少细菌负担，促进新生血管和胶原沉积，从而加速伤口愈合。总之，这种具有生物活性和抗菌的微针平台为治疗慢性糖尿病伤口提供了一种很有前景的策略，具有临床应用潜力。

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引用次数: 0

Precipitate sequence, strengthening mechanism and properties of Cu-0.9Be-1.0Ni alloys prepared by powder metallurgy 粉末冶金Cu-0.9Be-1.0Ni合金的析出顺序、强化机理及性能

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-13 DOI: 10.1016/j.matdes.2026.115481

Zuozhe Niu , Rulong Ma , Pei Wang , Zhenhua Hao , Yongchun Shu , Jilin He

The present investigation provides a comprehensive analysis of sintering, solid-solution treatment, and aging effects on precipitation behavior in powder-metallurgy processed the Cu-0.9Be-1.0Ni alloys. Optimal processing of the powder-metallurgy Cu-0.9Be-1.0Ni alloy occurs at 850°C (sintering), 950°C (solid-solution), and 350°C (aging). Comparing hot-press sintering (HPS) with spark plasma sintering (SPS) reveals distinct microstructure-property relationships in the Cu-0.9Be-1.0Ni alloy. At peak aging (350°C, 240 min), the HPS and SPS alloys exhibit microhardness values of 268.8 HV and 282.5 HV, respectively. During aging process, the precipitation evolution sequence of both the HPS and SPS alloys is GP zone + γ″ + γ′ → γ″ + γ′ → γ′ → γ′+ γ. The HPS alloy exhibits a higher σ_UTS of 860.76 MPa compared to the SPS alloy. Meanwhile, the HPS alloy exhibits significantly higher work-hardening index during homogeneous plastic deformation. This results from the finer grain structure of the HPS alloy and its distinct precipitation kinetics during subsequent aging compared to the SPS alloy. The Δσ calculated for the HPS and SPS alloys at peak aging using the Orowan strengthening mechanism are about 492.2 MPa and 476 MPa (consistent with experimental data), respectively.

本文综合分析了烧结、固溶处理和时效对Cu-0.9Be-1.0Ni合金粉末冶金析出行为的影响。粉末冶金Cu-0.9Be-1.0Ni合金的最佳加工温度分别为850℃（烧结）、950℃（固溶）和350℃（时效）。对比热压烧结（HPS）和放电等离子烧结（SPS），发现Cu-0.9Be-1.0Ni合金具有明显的组织性能关系。峰值时效（350℃，240 min）时，HPS和SPS合金的显微硬度分别为268.8 HV和282.5 HV。时效过程中，HPS和SPS合金的析出演化顺序均为GP区+ γ″+ γ′→γ″+ γ′→γ′→γ′+ γ′。HPS合金的σUTS为860.76 MPa，高于SPS合金。同时，HPS合金在均匀塑性变形过程中表现出较高的加工硬化指数。这是由于HPS合金的晶粒结构更细，在随后的时效过程中，与SPS合金相比，HPS合金具有独特的析出动力学。采用Orowan强化机制对HPS和SPS合金进行峰值时效时的Δσ计算值分别为492.2 MPa和476 MPa（与实验数据一致）。

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引用次数: 0

Achieving high effective permeability and low core loss in Fe-6.5 wt%Si soft magnetic composites via plasma coating method 采用等离子体涂层法制备Fe-6.5 wt%Si软磁复合材料，实现了高有效磁导率和低磁芯损耗

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-13 DOI: 10.1016/j.matdes.2026.115486

Jiwei Lv , Weisi Cai , Hongzhen Li , Zhicheng He , Pengxu Li , Tao Song , Hongwei Ma , Luoxuan Hu , Huanlin Peng , Chao Yang

Simultaneously achieving high effective permeability and low core loss in soft magnetic composites (SMCs) remains challenging. To address this issue, we report a plasma coating method to fabricate Fe-6.5 wt%Si SMCs with organic resin insulation layer and further clarify the underlying coating mechanism. Relative to convention coating, interestingly, the plasma coating can result in the more uniform and thinner insulation layer, eliminate powder agglomeration and consequently improve the flowability for the Fe-6.5 wt%Si powders. This leads to the greater electrical resistance and higher density in the plasma-coated Fe-6.5 wt%Si SMCs. Accordingly, the plasma-coated SMCs achieve the high effective permeability of 110.7 and low core loss of 373.5 kW/m³ at 50 mT and 100 kHz, which are respectively 33.4% greater and 34.5% lower than the corresponding ones in the conventional-coated SMC. The excellent soft magnetic properties are far superior to those of other typical SMCs reported so far. Basically, the plasma coating mechanism includes the pyrolyzing of insulation resin and its repolymerizing on the surface of Fe-6.5 wt%Si powders under discharge plasma effect in vibration condition, thereby forming a uniform and thin insulation layer without powder agglomeration. Our work provides a novel pathway for achieving superior comprehensive soft magnetic properties of SMCs.

同时在软磁复合材料（SMCs）中实现高有效磁导率和低磁芯损耗仍然是一个挑战。为了解决这一问题，我们报道了一种等离子体涂层方法，在有机树脂绝缘层上制备Fe-6.5 wt%Si的SMCs，并进一步阐明了潜在的涂层机理。有趣的是，相对于传统涂层，等离子涂层可以使Fe-6.5 wt%Si粉末的绝缘层更均匀、更薄，消除粉末团聚，从而提高粉末的流动性。这使得等离子体涂层的Fe-6.5 wt%Si SMCs具有更大的电阻和更高的密度。在50 mT和100 kHz时，等离子体包覆SMC的有效磁导率为110.7，磁芯损耗为373.5 kW/m3，分别比传统包覆SMC高33.4%和34.5%。优异的软磁性能远远优于目前报道的其他典型SMCs。等离子体包覆机理基本包括在振动条件下放电等离子体效应下绝缘树脂在Fe-6.5 wt%Si粉末表面的热解和再聚合，从而形成均匀而薄的保温层，无粉末团聚。我们的工作为实现SMCs优异的综合软磁性能提供了新的途径。

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引用次数: 0

Nanozymes in IBD therapy: Rational design, catalytic mechanisms and targeted therapies delivery 纳米酶在IBD治疗中的应用：合理设计、催化机制和靶向治疗

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-12 DOI: 10.1016/j.matdes.2026.115475

Tingting Hu , Xiaoting Zhang , Mengmeng Dong , Fei Kong , Zhen Wang , Kaiqiang Li , Yu Cai , Xiangmin Tong , Ke Hao

Inflammatory bowel disease (IBD) is a chronic immune-mediated disorder driven by oxidative stress and pathological immune activation. Current clinical treatments frequently yield suboptimal therapeutic outcomes and are hampered by substantial off-target effects. In this context, nanozymes, which are nanomaterials possessing intrinsic enzyme-mimicking activities, have arisen as a promising therapeutic platform for the management of IBD.

This review systematically explores the rational design of nanozymes, focusing on how machine learning-guided discovery and structural engineering advance both metal-based and non-metal-based systems. We further elucidate their therapeutic mechanisms in IBD, highlighting their dual capacity to scavenge reactive oxygen and nitrogen species while modulating pathological immune responses. Additionally, we examine advanced delivery platforms, including microenvironment-responsive nanocarriers and bio-hybrid systems, which enable precise targeting of inflamed intestinal tissues. Finally, the review concludes by critically assessing the current challenges in clinical translation and offering future perspectives to facilitate the transition of nanozymes from bench to bedside.

炎症性肠病（IBD）是一种由氧化应激和病理性免疫激活驱动的慢性免疫介导的疾病。目前的临床治疗经常产生不理想的治疗结果，并受到大量脱靶效应的阻碍。在这种背景下，纳米酶，一种具有内在酶模拟活性的纳米材料，已经成为治疗IBD的一个有前途的治疗平台。本文系统地探讨了纳米酶的合理设计，重点介绍了机器学习引导下的发现和结构工程如何推进金属基和非金属基系统。我们进一步阐明了它们在IBD中的治疗机制，强调了它们在调节病理性免疫反应的同时清除活性氧和活性氮的双重能力。此外，我们研究了先进的递送平台，包括微环境响应型纳米载体和生物混合系统，它们能够精确靶向炎症肠道组织。最后，综述总结了目前临床转化中的挑战，并提供了未来的观点，以促进纳米酶从实验室到床边的过渡。

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引用次数: 0

From billet to extruded band: Engineering texture and properties in AA6082 through die design and billet condition 从坯料到挤压带：通过模具设计和坯料条件，研究AA6082的工程织构和性能

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-11 DOI: 10.1016/j.matdes.2026.115478

Maria Nienaber , Fabian Esterl , Noomane Ben Khalifa , Jan Bohlen

This study investigates the influence of billet condition and die design on the microstructure, texture evolution, and mechanical properties of extruded AA6082 flat bands. Using cast and pre-extruded billets, profiles were produced with a conventional flat die and a modified die featuring a different press channel geometry, thereby altering local deformation conditions. Electron backscatter diffraction (EBSD) analyses were performed on both final profiles and billet remainders to trace texture development along the extrusion path. Pre-extruded billets showed enhanced recrystallization and finer, more homogeneous grain structures, while cast billets retained deformation textures and required higher strain accumulation to activate recrystallization nucleation mechanisms. The modified die promoted Goss texture formation and reduced peripheral coarse grain zones, resulting in improved ductility and reduced anisotropy. Finite element simulations confirmed smoother strain introduction in the modified die route, facilitating dynamic recrystallization. Mechanical testing revealed that the combination of pre-extruded billets and modified die yielded the most favorable properties, including high tensile strength and uniform elongation. These findings highlight the critical role of initial microstructure and strain path engineering in tailoring texture and mechanical performance in aluminum extrusion, offering practical guidance for optimizing lightweight structural components.

研究了坯料条件和模具设计对挤压AA6082平带组织、织构演变和力学性能的影响。使用铸造和预挤压坯料，用传统的平面模具和具有不同冲压通道几何形状的改进模具生产型材，从而改变局部变形条件。电子背散射衍射（EBSD）分析了最终轮廓和坯料残留物，以跟踪沿挤压路径的织构发展。预挤压方坯的再结晶增强，晶粒组织更细、更均匀，而铸方坯保留了形变织构，需要更高的应变积累来激活再结晶成核机制。改进后的模具促进了Goss织构的形成，减少了周围的粗晶粒区，从而提高了塑性和降低了各向异性。有限元模拟证实，改进后的模具路径引入的应变更平滑，有利于动态再结晶。力学试验表明，预挤压坯料和改性模具的组合获得了最有利的性能，包括高抗拉强度和均匀伸长率。这些发现突出了初始微观结构和应变路径工程在铝材挤压成形中裁剪织构和力学性能的关键作用，为优化轻量化结构部件提供了实践指导。

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引用次数: 0

Numerical and experimental analysis of a novel passive feedback valve for variable fluid volume metering in centrifugal microfluidic platforms 一种用于离心微流控平台变流量计量的新型被动反馈阀的数值与实验分析

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-10 DOI: 10.1016/j.matdes.2026.115474

Amirhossein Saboorinia , Amirhosein Ghasemi , Abas Ramiar

In lab-on-a-disc systems, operations that involve repeated reagent handling demand the integration of repeatable valves and a suitable metering unit operation. This study introduces and designs a novel operating unit called the feedback valve and investigates its performance through network simulation. This passive, integrated, and reusable unit, facilitates accurate fluid metering and enables reusable volume measurements. One of the key features of this unit is its ability to create an adjustable measurement range by varying the disk rotation speed. This capability, along with its repeatability, permits the measurement of different fluid volumes using only one specific geometry. This unit holds significant potential for laboratory applications such as ELISA and PCR, which involve multiple sequential washing steps. Experimental results show that at different radial positions of the siphon outlet (ranging from 25 to 40 mm), the volume of measured fluid can be adjusted between 60 and 270

μ L

by varying the disk rotation speed. The measured volumes showed a maximum standard error of the mean (SEM) of 5

μ L

(n = 5). This passive, repeatable, and adjustable valve enables precise fluid metering, though it is currently limited to fully sealed or ventless inlet chambers.

在光盘实验室系统中，涉及重复试剂处理的操作需要集成可重复的阀门和合适的计量单元操作。本文介绍并设计了一种新的操作单元——反馈阀，并通过网络仿真对其性能进行了研究。这种被动的，集成的，可重复使用的单元，有助于精确的流体计量，并实现可重复使用的体积测量。该装置的主要特点之一是它能够通过改变磁盘旋转速度来创建可调节的测量范围。这种能力及其可重复性允许仅使用一个特定的几何形状测量不同的流体体积。该装置具有重大的实验室应用潜力，如ELISA和PCR，涉及多个顺序洗涤步骤。实验结果表明，在虹吸出口的不同径向位置（25 ~ 40 mm），通过改变圆盘转速，被测流体的体积可在60 ~ 270 μL之间调节。所测体积的平均值（SEM）的最大标准误差为5 μL （n = 5）。这种被动的、可重复的、可调节的阀门可以实现精确的流体计量，尽管它目前仅限于完全密封或无排气的进口室。

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引用次数: 0

Theoretical model for the post-buckling of straight ribbons under static rotation and translation at bonding sites 键合点静态旋转和平移作用下直带材后屈曲的理论模型

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-10 DOI: 10.1016/j.matdes.2026.115472

Rui Lv, Daochun Li, Shiwei Zhao

Shape reconfigurations are gaining increasing attention in applications such as ingestible medical devices, microrobots, and tunable optoelectronics. The shape recovery and temporary fixation capabilities of shape memory polymer (SMP) substrates enable precise control over the placement of bonding sites, where 2D precursors are selectively attached to the substrate. This enables the controlled transformation of 2D precursors into 3D reconfigurable shapes. This work presents a finite-deformation buckling model for predicting the stable, post-buckling configurations of straight ribbons under the static rotations and translations imposed by the SMP substrate at the bonding sites. The model predictions are validated against finite element analysis and experimental results, confirming their accuracy and effectiveness. This provides a theoretical foundation for the precise control of shape transformation processes and potential applications in soft robotics and flexible electronics.

形状重构在可消化医疗设备、微型机器人和可调谐光电子等应用中越来越受到关注。形状记忆聚合物（SMP）基板的形状恢复和临时固定能力能够精确控制键合位点的位置，其中2D前体选择性地附着在基板上。这使得可以将2D前体控制转换为3D可重构形状。这项工作提出了一个有限变形屈曲模型，用于预测在SMP衬底在键合部位施加的静态旋转和平移作用下直带的稳定、后屈曲结构。通过有限元分析和实验结果验证了模型预测的准确性和有效性。这为形状变换过程的精确控制以及在软机器人和柔性电子领域的潜在应用提供了理论基础。

引用次数: 0

Fine-tuning cell-mimicking polyacrylamide microgels: Sensitivity to microscale reaction conditions in droplet microfluidics 微调细胞模拟聚丙烯酰胺微凝胶：对微滴微流体中微尺度反应条件的敏感性

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-10 DOI: 10.1016/j.matdes.2026.115450

Ruchi Goswami , Kyoohyun Kim , Aldo R. Boccaccini , Jochen Guck , Salvatore Girardo

Shaping polyacrylamide (PAAm) hydrogels via droplet microfluidics enables production of microgels that mimic cellular physical properties, advancing mechanobiology research. Controlling microgel size and elasticity is essential but challenging, as multiple factors influence polymerization and network formation. Although chemical reactions in microdroplets are generally faster and more uniform than in bulk, these microreactors are highly sensitive: small changes in chemical or physical conditions can cause significant variations in microgel properties. Our study identifies flow conditions as a crucial factor affecting both microgel elasticity and size by modulating interfacial transport during gelation. Using a flow-focusing microfluidic chip, we generated pre-gel droplets with the same composition in an oil phase, systematically varying the PAAm-to-oil flow rate ratio while maintaining a constant total flow rate. This method produced droplets with minimal size variation (<1 µm), but beads exhibited distinct Young’s moduli despite identical monomer concentrations. Further analysis showed that catalyst transport across the oil–water interface strongly impacts polymerization efficiency and network structure. These findings demonstrate that while droplet polymerization offers advantages, reproducible microgel properties demand precise flow control. This work emphasizes the critical role of microfluidic parameter tuning in advancing PAAm microgel applications in biophysics.

通过液滴微流体塑造聚丙烯酰胺（PAAm）水凝胶，可以生产模仿细胞物理特性的微凝胶，推进机械生物学研究。控制微凝胶的大小和弹性是必要的，但具有挑战性，因为多种因素影响聚合和网络的形成。虽然微滴中的化学反应通常比散装的更快更均匀，但这些微反应器高度敏感：化学或物理条件的微小变化会导致微凝胶性质的显著变化。我们的研究确定流动条件是影响微凝胶弹性和大小的关键因素，通过调节凝胶化过程中的界面传输。利用流动聚焦微流控芯片，我们在油相中生成了具有相同成分的预凝胶液滴，系统地改变了paam与油的流量比，同时保持了恒定的总流量。该方法产生的液滴尺寸变化最小（1 μ m），但尽管相同的单体浓度，液滴仍表现出不同的杨氏模量。进一步分析表明，催化剂在油水界面上的输运对聚合效率和网络结构有很大影响。这些发现表明，虽然液滴聚合具有优势，但可重现的微凝胶特性需要精确的流动控制。这项工作强调了微流体参数调整在推进PAAm微凝胶在生物物理学中的应用中的关键作用。

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引用次数: 0

Composition-properties-performance relationships of alkali-activated materials and geopolymers over extended silicon-aluminum-sodium-calcium ratios in adsorption applications 碱活性材料和地聚合物的组成-性能-性能关系在吸附应用中的扩展硅-铝-钠-钙比

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-09 DOI: 10.1016/j.matdes.2026.115471

Md Faysal Hossain , Md Akram Hossain , Mohammad Bhuyan , Jouko Vepsäläinen , Tero Luukkonen

Composition of alkali-activated materials (AAMs) and geopolymers affects their material properties and performance in adsorption applications, yet their correlations remain largely unexplored. In this study, AAMs/geopolymers were synthesized by systematically varying their compositions in the ranges Si₁Al₁Na₁–Si₂₀Al₁Na₁ (i.e., Ca-free geopolymers) and Si₁Al₁Na₁Ca₂–Si₂₀Al₁Na₁Ca₂₁ (i.e., Ca-containing AAMs). The material properties (e.g., connectedness of the aluminosilicate structure, specific surface area, pore volume, average pore size and zeta potential) of AAMs/geopolymers were correlated with adsorption performance for cations with different aqueous radii: methylene blue (MB), rhodamine 6G (R6G), and ammonium (NH₄⁺). In the Ca-free geopolymers, the adsorption of MB and R6G increased with increasing the Si/Al molar ratio and strongly correlated with specific surface area, whereas NH₄⁺ adsorption showed an opposite trend, correlating positively with the Al/Si ratio and zeta potential but negatively with specific surface area. Adding Ca to the systems caused the adsorption amounts for MB, R6G, and NH₄⁺ reaching a minimum at Si₅Al₁Na₁Ca₆ composition while lower or higher Ca content increased adsorption. The results of this study could be a valuable reference for tailoring the future AAM/geopolymer compositions over wide Si:Al:Na:Ca ratios to obtain specific material properties in high-end applications, such as wastewater treatment.

碱活化材料（AAMs）和地聚合物的组成会影响它们在吸附应用中的材料性质和性能，但它们之间的相关性在很大程度上仍未被探索。在本研究中，通过系统地改变其组成在Si1Al1Na1-Si20Al1Na1（即无ca地聚合物）和Si1Al1Na1Ca2-Si20Al1Na1Ca21（即含ca地聚合物）范围内合成了AAMs/地聚合物。AAMs/地聚合物的材料性能（如铝硅酸盐结构的连连性、比表面积、孔体积、平均孔径和zeta电位）与对亚甲基蓝（MB）、罗丹明6G （R6G）和铵（NH4+）等不同水半径阳离子的吸附性能相关。在无ca的地聚合物中，MB和R6G的吸附随Si/Al摩尔比的增加而增加，并与比表面积密切相关，而NH4+的吸附则相反，与Al/Si比和zeta电位呈正相关，与比表面积负相关。在Si5Al1Na1Ca6组成下，Ca的加入使体系对MB、R6G和NH4+的吸附量达到最小，而Ca含量的增加或降低会增加吸附量。这项研究的结果可以为定制未来宽Si:Al:Na:Ca比的AAM/地聚合物组成提供有价值的参考，以获得高端应用（如废水处理）中的特定材料性能。

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引用次数: 0

Tailoring mechanical properties and corrosion resistance via recrystallization-induced microstructural control in LPBF-fabricated IN718 lpbf制备IN718的再结晶诱导显微组织控制裁剪机械性能和耐蚀性

IF 7.9 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Materials & Design

Pub Date : 2026-01-09 DOI: 10.1016/j.matdes.2025.115426

Duy Nghia Luu, Jiazhao Huang, YanHan Liew, Andrew Nathaniels, Joel Yi Jin Goh, Jason Jyi Sheuan Ten

This work establishes a grain boundary engineering strategy for laser powder bed fused Inconel 718 by exploiting recrystallization-induced microstructural co-evolution. Columnar as-built and recrystallized twin-rich equiaxed microstructures are generated from a single LPBF build through tailored solution treatment, enabling a controlled comparison of grain morphology, Σ3 twin fraction, dislocation density, and Laves/δ phase segregation. The equiaxed condition, with isotropic ∼56.5 µm grains and 63.8% Σ3 boundaries, shows strongly reduced geometrically necessary dislocation density and Laves phase content relative to the columnar condition with ∼17.4 µm elongated grains. Furthermore, only nano-sized precipitates occur at twin boundaries, while the general high-angle grain boundaries are enriched in large Laves phases. This microstructural combination delivers favourable balanced properties, with only 6.8% loss in yield strength but greater strain hardening and 25.1% enhanced elongation at room temperature. Similar trends observed at 650 °C underscore the continued influence of initial microstructures. In aggressive boiling oxidizing solutions, the equiaxed microstructure forms significantly fewer Nb/Mo-rich scales and exhibits a ∼33% lower corrosion rate (39.24 vs 52.21 g/m²·h). The results show that recrystallization-driven twin network formation and Laves depletion provide an effective route to optimize mechanical performance and corrosion resistance in LPBF-fabricated IN718 simultaneously.

利用再结晶诱导的显微组织协同演化，建立了激光粉末床熔融Inconel 718的晶界工程策略。通过定制固溶处理，单个LPBF生成了柱状和再结晶的富孪晶等轴组织，从而可以对晶粒形貌、Σ3孪晶分数、位错密度和Laves/δ相偏析进行可控比较。在各向同性~ 56.5µm晶粒和63.8% Σ3晶界的等轴条件下，与具有~ 17.4µm拉长晶粒的柱状条件相比，在几何上必需的位错密度和Laves相含量明显降低。此外，孪晶界上只出现纳米级的析出相，而大的Laves相则富集了一般的高角度晶界。这种显微组织组合提供了良好的平衡性能，在室温下屈服强度仅损失6.8%，但应变硬化更大，延伸率提高25.1%。在650°C时观察到类似的趋势，强调了初始微观结构的持续影响。在侵略性沸腾氧化溶液中，等轴组织形成的Nb/ mo富垢明显减少，腐蚀速率降低约33% （39.24 vs 52.21 g/m2·h）。结果表明，再结晶驱动的孪晶网络形成和Laves损耗为同时优化lpbf制备IN718的力学性能和耐蚀性提供了有效途径。

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引用次数: 0