Materials & Design最新文献_第8页

Engineering mesoporous silica nanoparticles for cancer immunotherapy: mechanistic insights, therapeutic synergies, and translational roadmap 工程介孔二氧化硅纳米颗粒用于癌症免疫治疗：机制见解，治疗协同作用和转化路线图

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

Materials & Design

Pub Date : 2026-01-06 DOI: 10.1016/j.matdes.2026.115452

Adel Mahmoudi Gharehbaba , Fatemeh Soltanmohammadi , Morteza Eskandani , Khosro Adibkia

Cancer immunotherapy has revolutionized oncology but remains constrained by the immunosuppressive tumor microenvironment (TME), systemic toxicities, and inadequate delivery of biologic agents. Nanotechnology offers a promising avenue to overcome these hurdles, with mesoporous silica nanoparticles (MSNs) emerging as a particularly versatile platform. This review comprehensively analyzes the application of MSNs in advancing cancer immunotherapy. We begin by outlining the current landscape of immunotherapies and their limitations. We then delve into the unique physicochemical properties of MSNs, and their direct impact on immune cell engagement and intrinsic adjuvanticity. The core of the review details strategic MSN-based approaches for innate and adaptive immune reprogramming, including antigen/danger signal co-delivery, surface engineering for targeted delivery, and combination with modalities like photodynamic/photothermal therapy to induce immunogenic cell death. Furthermore, we explore high-impact, underexplored frontiers such as MSN-mediated delivery of mRNA vaccines and CRISPR-Cas9 machinery for TME reprogramming. Finally, we critically assess the translational pathway, identifying key bottlenecks in safety, manufacturing, and regulatory approval, while providing a preclinical roadmap and a comparative analysis against clinical-stage nanocarriers. This synthesis underscores the potential of MSNs not merely as passive carriers, but as active, multifunctional immunomodulatory platforms poised to enhance the efficacy and specificity of next-generation cancer immunotherapies.

癌症免疫治疗已经彻底改变了肿瘤学，但仍然受到免疫抑制肿瘤微环境（TME）、全身毒性和生物制剂递送不足的限制。纳米技术为克服这些障碍提供了一条很有前途的途径，介孔二氧化硅纳米颗粒（MSNs）正成为一种特别通用的平台。本文综合分析了msn在推进肿瘤免疫治疗中的应用。我们首先概述免疫疗法的现状及其局限性。然后，我们深入研究了msn独特的物理化学性质，以及它们对免疫细胞接合和内在佐剂的直接影响。该综述的核心详细介绍了基于msn的先天性和适应性免疫重编程的战略方法，包括抗原/危险信号共递送，靶向递送的表面工程，以及与光动力/光热疗法等方式联合诱导免疫原性细胞死亡。此外，我们还探索了高影响力、未被充分开发的前沿领域，如msn介导的mRNA疫苗递送和用于TME重编程的CRISPR-Cas9机制。最后，我们批判性地评估了转化途径，确定了安全性、制造和监管批准方面的关键瓶颈，同时提供了临床前路线图和与临床阶段纳米载体的比较分析。这一合成强调了msn的潜力，它不仅可以作为被动载体，还可以作为主动的多功能免疫调节平台，增强下一代癌症免疫治疗的疗效和特异性。

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引用次数: 0

Thiol-ene click-functionalized polybutadiene elastomers achieve durable and biocompatible polyurethanes for long-term implantable systems 巯基点击功能化聚丁二烯弹性体为长期植入式系统实现耐用和生物相容性聚氨酯

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

Materials & Design

Pub Date : 2026-01-06 DOI: 10.1016/j.matdes.2026.115455

Minghui Cui , Yu Liu , Guohui Tian , Junyi Zhou , Fenglong Li , Xiaolin Wang , Jing Chen , Haiming Chen , Jin Zhu , Jing Chen

Conventional polyurethanes for implants suffer from hydrolytic/oxidative degradation due to ester/ether bonds. To overcome this, in this research, we have developed aging-resistant implantable medical polyurethanes to address the issue of their limited durability. The synthesis involves ethanethiol for the click reaction-mediated elimination of the CC in terminal hydroxy polybutadiene (HTPB), resulting in the creation of HTPB-SH. Subsequently, an aging-resistant implantable polyurethane, HTPB-SH-PU, is synthesized. This material demonstrates not only remarkable thermal stability (T_d5%>290°C) but also superior mechanical performance, evidenced by a tensile strength of 35.1 MPa and an elongation at break of 196.74%. Moreover, HTPB-SH-PU is exhibiting outstanding aging resistance. In a hydrolysis aging test, it retains 71% of its tensile strength after 35 days, with negligible yellowing. To enhance biocompatibility, gastrodin is incorporated at various concentrations (0%, 0.5%, 1.0%, 2.0%), and the modified polyurethanes display excellent cytocompatibility, haemocompatibility, and histocompatibility. Therefore, the HTPB-SH-PU series represents a promising candidate for implantable medical devices such as pacemakers and artificial blood vessels, offering a solid theoretical foundation and material options for future research and development in medical polymers.

由于酯/醚键，用于植入物的传统聚氨酯容易水解/氧化降解。为了克服这一点，在这项研究中，我们开发了抗老化的植入式医用聚氨酯，以解决其有限的耐用性问题。该合成涉及乙硫醇，通过点击反应介导消除末端羟基聚丁二烯（HTPB）中的CC，从而产生HTPB- sh。随后，合成了一种耐老化的植入式聚氨酯HTPB-SH-PU。该材料不仅具有优异的热稳定性（Td5%>290°C），而且具有优异的力学性能，抗拉强度为35.1 MPa，断裂伸长率为196.74%。HTPB-SH-PU具有优异的耐老化性能。在水解老化试验中，35天后仍保持71%的抗拉强度，黄变可以忽略不计。为了提高生物相容性，天麻素以不同的浓度（0%、0.5%、1.0%、2.0%）掺入，改性聚氨酯具有良好的细胞相容性、血液相容性和组织相容性。因此，htpcb - sh - pu系列代表了植入式医疗设备（如起搏器和人造血管）的有希望的候选者，为未来医用聚合物的研究和开发提供了坚实的理论基础和材料选择。

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引用次数: 0

Tuning surface microtopography for optimum thermocompression bonding performance: structure, process parameters, and mechanisms on microfluidic chips 调整表面微形貌以获得最佳热压键合性能：微流控芯片的结构、工艺参数和机制

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

Materials & Design

Pub Date : 2026-01-05 DOI: 10.1016/j.matdes.2026.115448

Baishun Zhao , Dimitrios Kontziampasis , Zhiyu Yang , Bingyan Jiang , Wangqing Wu (吴旺青) , Dou Zhang

The widespread application of microfluidic chips in biomedicine, life sciences, and food safety has generated industrialization demands, making it necessary to address key challenges in production costs and scalability. This work proposes the fabrication of an innovative microstructure in microfluidic chips to enhance thermocompression bonding performance. Through simulation, the stress mitigation effect of the energy-gathering rib (ER) and the resulting microchannel deformation are analyzed. This analysis subsequently feeds a redesign of the initial reference microchannel structure, acting as a guide. Experimental validation follows to confirm the enhancement of bonding performance by the ER. Results demonstrate that compared to the initial microchannel, the new design increases bonding strength by 123 % and reduces microchannel deformation by 6–8.46 %. Further analysis reveals that bonding strength increases by 160 % in the pressure range of 0.6–1.56 MPa. Additionally, this work advances the general understanding of the bonding strength formation mechanism by clearly elucidating the evolutionary behavior of interfacial morphology at the bonded interface. The generated knowledge accelerates the commercialization of microfluidic chips by directly improving the economic efficiency and sustainability of the fabrication process.

微流控芯片在生物医学、生命科学、食品安全等领域的广泛应用产生了产业化需求，需要解决生产成本和可扩展性方面的关键挑战。这项工作提出了一种创新的微流控芯片微结构的制造，以提高热压键合性能。通过仿真，分析了聚能肋的应力缓解效果以及由此产生的微通道变形。该分析随后提供了初始参考微通道结构的重新设计，作为指南。实验验证证实了ER对键合性能的增强。结果表明，与初始微通道相比，新设计的微通道结合强度提高了123%，微通道变形减少了6 - 8.46%。进一步分析表明，在0.6 ~ 1.56 MPa的压力范围内，结合强度提高了160%。此外，本工作通过清楚地阐明界面形态的演化行为，促进了对键合强度形成机制的一般理解。通过直接提高制造过程的经济效率和可持续性，所产生的知识加速了微流控芯片的商业化。

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引用次数: 0

Improvement of tensile and Charpy impact properties of thick hot-rolled duplex lightweight steel plates through aging treatment 通过时效处理改善热轧双相轻钢厚板的拉伸性能和夏比冲击性能

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

Materials & Design

Pub Date : 2026-01-05 DOI: 10.1016/j.matdes.2026.115444

Junha Yang , Sukjin Lee

Mechanical properties of thick steel plates used in shipbuilding, construction, and marine structures are critical, particularly under low-temperature and high-impact conditions. In this study, effects of aging temperature on stability of austenite and activation of TRIP and TWIP mechanisms on tensile and Charpy impact properties were analyzed for thick hot-rolled duplex lightweight steel plates. Unaged (as-rolled) C2 (Fe-0.2C-15Mn-6Al) specimen, with low stacking fault energy (SFE), was expected to activate the TRIP effect, but cracks easily initiated and propagated due to the numerous and wide ferrite/austenite interfaces, preventing sufficient activation of TRIP effect. In contrast, unaged C4 (Fe-0.4C-15Mn-6Al) specimen delayed the propagation of interfacial cracks, allowing the TRIP effect to activate, which improved the tensile strength and impact properties. After aging treatment, C4 specimen showed increased κ-carbide precipitation, reducing SFE and further activating the TRIP effect, which resulted in 296 J of Charpy impact absorption energy at room temperature and 196 J at −60 °C. This confirmed the importance of aging treatment for thick plate applications, and emphasized the significance of microstructure design for optimizing the performance of duplex lightweight steels. By minimizing ferrite/austenite interface separation and maximizing the TRIP effect, mechanical properties of the steel plates could be enhanced. In particular, aged C4 specimen provided high impact absorption and tensile properties, suggesting that excellent performance can be achieved through cost-efficient traditional manufacturing processes.

用于造船、建筑和海洋结构的厚钢板的机械性能是至关重要的，特别是在低温和高冲击条件下。本研究分析了时效温度对热轧双相轻钢奥氏体稳定性的影响，以及TRIP和TWIP活化机制对热轧双相轻钢厚板拉伸和夏比冲击性能的影响。未时效（轧制）的C2 （Fe-0.2C-15Mn-6Al）试样具有较低的层错能（SFE），有望激活TRIP效应，但由于铁素体/奥氏体界面众多且宽，裂纹容易产生和扩展，阻碍了TRIP效应的充分激活。相比之下，未老化的C4 （Fe-0.4C-15Mn-6Al）试样延迟了界面裂纹的扩展，使TRIP效应得以激活，从而提高了拉伸强度和冲击性能。时效处理后，C4试样的κ-碳化物析出增加，降低了SFE，进一步激活了TRIP效应，导致室温下的Charpy冲击吸收能为296 J，−60℃时为196 J。这证实了时效处理对厚板应用的重要性，并强调了微观组织设计对优化双相轻钢性能的重要性。通过减少铁素体/奥氏体界面分离和最大化TRIP效应，可以提高钢板的力学性能。特别是，老化的C4样品具有较高的冲击吸收和拉伸性能，这表明通过经济高效的传统制造工艺可以实现优异的性能。

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引用次数: 0

Corrosion and hydrogen permeation behavior of a marine high-strength steel under the influence of macrofouling organisms 大型污染生物影响下海洋高强钢的腐蚀和氢渗透行为

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

Materials & Design

Pub Date : 2026-01-05 DOI: 10.1016/j.matdes.2026.115447

Xiaoyu Hou , Yanliang Huang , Shaohua Xing , Yuxin Wang , Fanfan Cai , Jiayan Pu , Yu Xin

Marine biofouling poses a significant threat to the integrity of marine high-strength steel. This study systematically investigated the influence of macrofouling organisms (barnacles, oysters, and mussels) on the corrosion and hydrogen permeation behavior of a marine high-strength steel through real-sea exposure tests and electrochemical analysis. The results revealed that macrofouling transformed the corrosion mode from uniform corrosion to severe localized pitting and crevice corrosion. The formation of occluded cells beneath the attached organisms induced local acidification and chloride enrichment. Furthermore, the proliferation of sulfate-reducing bacteria (SRB) in these microenvironments generated electrically conductive FeS and promoted cathodic depolarization. Crucially, the coupling of acidic occluded cells and SRB metabolic products—which inhibit hydrogen recombination—significantly enhanced the hydrogen permeation flux. This synergistic intensification of localized corrosion and hydrogen uptake markedly increases the material’s susceptibility to stress corrosion cracking (SCC) and hydrogen embrittlement. These findings provide essential theoretical insights for the service safety assessment of high-strength steels in marine environments.

海洋生物污染对海洋高强钢的完整性构成了严重威胁。本研究通过实际海暴露试验和电化学分析，系统研究了大型污染生物（藤壶、牡蛎和贻贝）对海洋高强钢腐蚀和氢渗透行为的影响。结果表明，大污染使腐蚀模式由均匀腐蚀转变为严重的局部点蚀和缝隙腐蚀。附着生物下面的闭塞细胞的形成引起局部酸化和氯化物富集。此外，硫酸盐还原菌（SRB）在这些微环境中的增殖产生导电FeS并促进阴极去极化。关键是，酸性闭塞细胞与SRB代谢产物的偶联（抑制氢重组）显著增强了氢渗透通量。这种局部腐蚀和氢吸收的协同强化显著增加了材料对应力腐蚀开裂（SCC）和氢脆的敏感性。这些发现为海洋环境中高强度钢的使用安全性评估提供了重要的理论见解。

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引用次数: 0

Compression and vibration isolation properties of metamaterials with variable Poisson’s ratios and cosine-shaped beams 变泊松比和余弦形梁超材料的压缩和隔振性能

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

Materials & Design

Pub Date : 2026-01-05 DOI: 10.1016/j.matdes.2026.115445

Huiyin Huang , Rendong Pi , Zhendong Li , Xiang Yu

Metamaterials have attracted considerable attention for their exceptional performance and multifunctionality. Traditional honeycomb structures with periodically arranged straight beams often exhibit limited mechanical properties and a narrow range of applications. To address these limitations, this study proposes a novel metamaterial design featuring cosine-shaped beams inspired by the biomechanics of the human spine and the curved architecture of cuttlebone, allowing for tunable Poisson’s ratios. The compression mechanical properties and vibration isolation performance of these structures are systematically investigated through analytical modeling, quasi-static compression experiments, finite element simulations, and vibration isolation tests. Results reveal that adjusting cell angles of structures can enhance deformation stability and enable stiffness tuning. Compared to straight beam structures, the proposed cosine-shaped beam structures exhibit wider vibration isolation frequency range. Structures with zero Poisson’s ratio demonstrate superior vibration isolation at small cell angles, while those with negative Poisson’s ratio at specific cell angle achieve an optimal balance of high strength, energy absorption, and vibration isolation. This study provides systematic guidance for designing metamaterials with adjustable multifunctional mechanical properties, offering innovative solutions for advanced engineering applications across diverse fields.

超材料以其优异的性能和多功能性引起了人们的广泛关注。具有周期性排列的直梁的传统蜂窝结构往往表现出有限的力学性能和狭窄的应用范围。为了解决这些限制，本研究提出了一种新的超材料设计，其特点是受人类脊柱的生物力学和海骨的弯曲结构的启发，具有余弦形状的光束，允许可调的泊松比。通过分析建模、准静态压缩实验、有限元模拟和隔振试验，系统地研究了这些结构的压缩力学性能和隔振性能。结果表明，调整结构单元角度可以提高结构的变形稳定性，实现刚度调节。与直梁结构相比，所提出的余弦型梁结构具有更宽的隔振频率范围。泊松比为零的结构在小胞角处具有较好的隔振性能，而在特定胞角处泊松比为负的结构在高强度、吸能和隔振方面达到最佳平衡。该研究为设计具有可调节多功能力学性能的超材料提供了系统的指导，为不同领域的先进工程应用提供了创新的解决方案。

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引用次数: 0

Synergistic control of microstructure and mechanical properties in low-carbon alloyed bulb flat steel through multistage induction quenching 多级感应淬火对低碳合金球泡扁钢组织和力学性能的协同控制

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

Materials & Design

Pub Date : 2026-01-04 DOI: 10.1016/j.matdes.2026.115446

Zhide Zhan, Fengrui Liang, Xu Wei, Xiaobing Luo, Zhongran Shi, Feng Chai

High-strength, tough bulb flat steel is critical for hull stiffness regulation and lightweight design. Conventional furnace quenching of bulb flat steel suffers from inherent limitations including significant deformation, challenging straightening, and considerable fluctuations in mechanical properties. This study introduces a multi-stage induction heating technique that effectively addresses these issues, enabling successful induction quenching of large-scale bulb flat steel while incorporating embedded thermocouples for real-time monitoring of the temperature field. Experimental results demonstrate that three-stage high-temperature quenching (3IH) reduces the peak temperature variation across the bulb section by 55 % and decreases the yield strength differential between the bulb and flat by 73 %. The superior performance of 3IH is attributed to enhanced microstructural homogeneity under elevated temperatures, which improves strength uniformity through dislocation-mediated mechanisms. In contrast, two-stage low-temperature quenching (2IH) exhibits marginally lower strength but achieves exceptional ultra-low temperature toughness (−100 °C, KV₂ ≥ 190 J) via synergistic effects of multiphase microstructure and grain refinement. The formation of multiphase microstructure in 2IH is governed by carbon diffusion coefficient, diffusion duration, and undissolved ferrite content. Furthermore, the flat region in 2IH undergoes a distinctive two-stage austenitization process that introduces high-density dislocations, resulting in greater dislocation strengthening contributions compared to 3IH.

高强度、高韧性球茎扁钢对船体刚度调节和轻量化设计至关重要。球型扁钢的传统电炉淬火存在固有的局限性，包括明显的变形、具有挑战性的矫直以及机械性能的相当大的波动。本研究介绍了一种多级感应加热技术，有效地解决了这些问题，使大型球型扁钢成功感应淬火，同时结合嵌入式热电偶实时监测温度场。实验结果表明，三级高温淬火（3IH）使球茎截面的峰值温度变化降低了55%，使球茎与平板之间的屈服强度差降低了73%。3IH的优异性能归因于高温下增强的显微组织均匀性，这通过位错介导的机制提高了强度均匀性。相比之下，两段低温淬火（2IH）的强度略低，但通过多相组织和晶粒细化的协同作用，获得了优异的超低温韧性（- 100°C, KV2≥190 J）。2IH中多相组织的形成受碳扩散系数、扩散时间和未溶铁素体含量的影响。此外，与3IH相比，2IH的平坦区经历了独特的两阶段奥氏体化过程，引入了高密度的位错，导致更大的位错强化贡献。

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引用次数: 0

3D printed, dissolvable molds for the fabrication of geometrically complex, elastomeric energy absorbers 3D打印，可溶解的模具，用于制造几何复杂的弹性能量吸收器

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

Materials & Design

Pub Date : 2026-01-03 DOI: 10.1016/j.matdes.2026.115443

D.J. Bischoff , M.J. DeGrange , J.M. Morales-Ferrer , A.M. Clay , E.D. Wetzel

Elastomeric, architected energy absorbers are fabricated by fused filament fabrication (FFF) of dissolvable molds, casting and curing elastomeric resins in the mold cavities, and then dissolving the mold. Multiple mold materials and dissolution solvents are considered, with water-soluble, butenediol vinyl alcohol copolymer (BVOH) molds down selected based on compatibility and dissolution rate studies. A diverse set of lattices, springs, and generalized cylindrical shells are fabricated using cast silicone and urethane elastomers with durometers from 20A to 60D, as well as a foamed elastomer lattice and a glassy epoxy lattice. The use of vacuum during casting enables fine features with high geometric accuracy. Comparisons between cast springs and elastomeric springs fabricated directly via FFF show the superior geometric resolution, and mechanical property space, available using this casting approach. Quasistatic and dynamic compression are performed demonstrating a wide range of mechanical responses, including high energy absorption efficiency. Additional hybrid lattices are fabricated using two different polymers within a single, interlocked structure. The results of this study demonstrate that FFF of dissolvable molds can be used to fabricate complex geometry energy absorbers over a wider range of material properties and chemistries, and with superior feature resolution, compared to the direct FFF fabrication of such structures.

弹性结构吸能器是通过熔融长丝制造（FFF）的可溶模具，浇铸和固化弹性树脂在模腔，然后溶解模具。考虑了多种模具材料和溶解溶剂，根据相容性和溶解速率研究选择了水溶性丁烯二醇乙烯醇共聚物（BVOH）模具。各种各样的晶格、弹簧和广义的圆柱壳是用硬度从20A到60D的铸造硅树脂和聚氨酯弹性体，以及泡沫弹性体晶格和玻璃环氧晶格制造的。在铸造过程中使用真空可以实现高几何精度的精细特征。将铸造弹簧与直接通过FFF制造的弹性弹簧进行比较，可以发现使用这种铸造方法可以获得更好的几何分辨率和力学性能空间。准静态和动态压缩进行了证明了广泛的机械响应，包括高能量吸收效率。额外的杂化晶格是用两种不同的聚合物在一个单一的联锁结构中制造的。本研究的结果表明，与直接FFF制造此类结构相比，可溶解模具的FFF可用于制造复杂几何形状的能量吸收器，其材料性能和化学性质范围更广，并且具有更高的特征分辨率。

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引用次数: 0

Microstructure and compression behavior of powder-metallurgy processed fine-grained TWIP steel 粉末冶金处理细晶TWIP钢的组织与压缩性能

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

Materials & Design

Pub Date : 2026-01-03 DOI: 10.1016/j.matdes.2026.115441

Xu Liu , Liangliang Huang , Dan Wang , Wen Wang

To enhance the strength of twinning-induced plasticity (TWIP) steels and promote their engineering application, powder metallurgy (PM) was employed in this study to directly produce fine-grained TWIP steels with average grain sizes of 2.93–11.93 μm, bypassing complex conventional processes involving induction melting, plastic deformation, and heat treatment. The quasi-static and dynamic compression properties of these samples exhibited a typical grain size dependence. Compared to the quasi-statically compressed samples, the dynamically compressed samples demonstrated enhanced work hardening, characterized by a higher flow stress and an increased work-hardening rate, along with a notable positive strain rate sensitivity. High-speed impact activated significant dislocation glide, leading to rapid dislocation multiplication, extensive twin nucleation, and particle deformation that generated high-energy distortion zones. This process also produced a high density of low-angle boundaries (LABs). Grain boundaries (GBs) and precipitation strengthening were the main drivers of work hardening. These mechanisms involved dislocation interactions with single Mn-rich particles, GB-associated particles, and those linked to twins. In contrast, twinning strengthening played a minor role due to the poor twin structure resulting from the suppressed twinning.

为了提高孪生诱导塑性（TWIP）钢的强度，促进TWIP钢的工程应用，本研究采用粉末冶金技术直接制备了平均晶粒尺寸为2.93 ~ 11.93 μm的TWIP钢，绕过了复杂的传统工艺，包括感应熔化、塑性变形和热处理。这些样品的准静态和动态压缩性能表现出典型的晶粒尺寸依赖性。与准静态压缩试样相比，动态压缩试样表现出更强的加工硬化，其特征是更高的流动应力和更高的加工硬化速率，以及显著的正应变率敏感性。高速冲击激活了显著的位错滑动，导致位错快速增殖，广泛的孪核和颗粒变形，产生了高能变形区。这个过程也产生了高密度的低角度边界（lab）。晶界和析出强化是加工硬化的主要驱动因素。这些机制包括与单个富锰颗粒、gb相关颗粒和双胞胎相关颗粒的位错相互作用。相比之下，孪晶强化作用较小，因为孪晶抑制导致孪晶结构较差。

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引用次数: 0

Dynamic mechanical properties and energy dissipation analyses of cement-iron ore tailings foam composites with various fiber types and contents 不同纤维类型和掺量水泥-铁矿尾砂泡沫复合材料动态力学性能及耗能分析

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

Materials & Design

Pub Date : 2026-01-03 DOI: 10.1016/j.matdes.2026.115442

Shawei Zhang , Chao Li , Wensu Chen , Pengfei Liu , Shibin Lin , Hong-Nan Li

The cement-iron ore tailings foam composite (CIFC) provides a sustainable solution by partially replacing cement with iron ore tailings. Fibers can be incorporated into composite materials to improve crack resistance and toughness, thereby enhancing dynamic mechanical performance. However, the dynamic properties of CIFC with fibers remain inadequately explored. This study investigates the dynamic compressive behavior of CIFC reinforced with glass fiber (GF), basalt fiber (BF), and polyvinyl alcohol fiber (PVAF) at contents ranging from 1.0 % to 2.5 % under varying strain rates. X-ray diffraction (XRD) indicates a higher content of hydration products in BF- and PVAF-reinforced CIFC than in the GF-reinforced composite. Scanning electron microscopy (SEM) reveals that a fiber content of 2.0 % optimizes fiber–matrix bonding and reduces interconnected pores and micro-cracks. Dynamic tests using a split Hopkinson pressure bar (SHPB) show that all specimens reach optimum performance at a fiber content of 2.0 % at strain rates of 120–250 s⁻¹. PVAF-reinforced CIFC exhibits superior structural integrity after impact, while GF-reinforced CIFC achieves higher dynamic mechanical performance. For instance, at 250 s⁻¹, GF2.0 attains a compressive strength of 18.21 MPa, compared to 14.49 MPa for BF2.0 and 13.24 MPa for PVAF2.0. Energy dissipation analysis further reveals the strong dependence of energy absorption on fiber type and content. Among all mixes, GF2.0 exhibits the greatest sensitivity to input energy, with its strain energy density (SED) increasing from 262.48 to 1300.29 kJ/m³, energy dissipation ratio (R) from 2.14 % to 9.66 %, and dissipated energy density (E_V) from 62.37 to 1231.02 kJ/m³, respectively, as the input energy rises from 515.50 to 2229.30 J. These findings provide insights for designing impact-resistant structural applications using CIFC with optimized fiber parameters.

水泥-铁矿尾砂泡沫复合材料（CIFC）是一种用铁矿尾砂部分替代水泥的可持续解决方案。在复合材料中掺入纤维可以提高材料的抗裂性和韧性，从而提高材料的动态力学性能。然而，对含纤维的CIFC的动态特性研究还不够充分。本文研究了玻璃纤维（GF）、玄武岩纤维（BF）和聚乙烯醇纤维（PVAF）在1.0% ~ 2.5%含量范围内增强的CIFC在不同应变速率下的动态压缩行为。x射线衍射（XRD）结果表明，BF和pvaf增强的CIFC的水化产物含量高于gf增强的复合材料。扫描电镜（SEM）显示，2.0%的纤维含量优化了纤维与基体的结合，减少了相互连接的孔隙和微裂纹。采用分离式霍普金森压杆（SHPB）进行的动态试验表明，当纤维含量为2.0%时，在应变速率为120-250 s−1时，所有试样均达到最佳性能。pvaf增强的CIFC具有较好的冲击后结构完整性，而gf增强的CIFC具有较高的动态力学性能。例如，在250 s−1时，GF2.0的抗压强度为18.21 MPa，而BF2.0为14.49 MPa, PVAF2.0为13.24 MPa。能量耗散分析进一步揭示了能量吸收对纤维种类和含量的强烈依赖性。在所有混合材料中，GF2.0对输入能量的敏感性最大，当输入能量从515.50 j增加到2229.30 j时，其应变能密度（SED）从262.48增加到1300.29 kJ/m3，能量耗散比(R)从2.14%增加到9.66%，耗散能密度（EV）从62.37增加到1231.02 kJ/m3。这些研究结果为使用优化纤维参数的CIFC设计抗冲击结构应用提供了参考。

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引用次数: 0