Journal of Materials Research and Technology-Jmr&t最新文献_第7页

The effects of combining thermal, chemical and mechanical treatments on the electrical performance of wet-pulled carbon nanotube fibers 热、化学和机械复合处理对湿拉碳纳米管纤维电性能的影响

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.157

Aliya R. Vildanova , Hassaan A. Butt , Svetlana I. Serebrennikova , Ilya V. Novikov , Sergei P. Shadrov , Veronika A. Dmitrieva , Vladislav A. Kondrashov , Yulia V. Ioni , Qibo Deng , Puguang Ji , Dmitry V. Krasnikov , Anastasia E. Goldt , Sergey D. Shandakov , Fedor S. Fedorov , Albert G. Nasibulin

This work systematically investigates how thermal, chemical and mechanical post-fabrication treatments influence the electrical performance of wet-pulled carbon nanotube fibers (CNTFs). The induced changes caused by combining the treatments were evaluated using Raman and Fourier Transform Infrared spectroscopy, scanning electron and atomic force microscopy (SEM and AFM), and DC electrical characterization techniques. Typical wet-pulled CNTFs showed electrical conductivity values of ∼600 S/cm, and thermal treatment slightly reduced the conductivity to ∼450 S/cm. This decrease is compensated by the increase in susceptibility towards doping with HAuCl₄, yielding a conductivity increase up to ∼1400 S/cm. When thermal annealing and mechanical densification are followed by immersion in HAuCl₄ solution, electrical conductivity as high ∼10,000 S/cm can be reached due to the surface deposition of gold particles. However, by combining doping and mechanical densification treatments simultaneously, the precipitation and distribution of gold particles can be homogeneous throughout the volume of the CNTFs, leading to similar conductivity (∼9000 S/cm) with better resilience under applied voltage. This work aims to clearly outline the relationship between the structural and electrical changes caused by each augmentation technique, as well as their combinations, allowing rational design selection for high performance CNTF alternative conductors.

本研究系统地研究了热、化学和机械加工后处理如何影响湿拉碳纳米管纤维（CNTFs）的电性能。利用拉曼光谱和傅里叶变换红外光谱、扫描电子和原子力显微镜（SEM和AFM）以及直流电表征技术对复合处理引起的诱导变化进行了评估。典型湿拉cntf的电导率值为~ 600 S/cm，热处理将其电导率略微降低至~ 450 S/cm。这种减少被对HAuCl4掺杂的敏感性增加所补偿，电导率增加到~ 1400 S/cm。当热处理和机械致密化之后，再浸泡在HAuCl4溶液中，由于金颗粒的表面沉积，电导率可以达到高~ 10,000 S/cm。然而，通过同时结合掺杂和机械致密化处理，金颗粒的沉淀和分布可以均匀地分布在cntf的整个体积中，从而导致相似的电导率（~ 9000 S/cm），并且在外加电压下具有更好的弹性。这项工作旨在清楚地概述每种增强技术引起的结构和电气变化之间的关系，以及它们的组合，从而允许合理的设计选择高性能CNTF替代导体。

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引用次数: 0

Effects of Bi content on melting characteristics, microstructure, and shear strength of Sn-based solders 铋含量对锡基钎料熔化特性、显微组织和抗剪强度的影响

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.154

Qi-ming Chen , Liang Zhang , Yu-hao Chen , Lei Shi , Jia-min Zhang , Mo Chen

This study investigates the effects of Bi content (0, 10, 20, 30, 45, 58 wt%) on the wettability, melting characteristics, microstructure, interfacial reactions, and shear strength of Sn-based solders with Cu substrates. The study primarily focused on the evolution of microstructural products and solder properties during the transition from pure Sn solder to Sn–Bi eutectic solder, aiming to establish a foundation for further in-depth research and modification strengthening of Sn–Bi series solders. Compared to pure Sn solder, Sn–58Bi solder exhibited a 67.6 % reduction in wetting angle, achieving 9.28°. The peak temperature was 37.4 % lower at 142.9 °C. The thickness of the intermetallic compound (IMC) layer exhibited an initial increase followed by a decrease as the Bi content rose. A minimum IMC thickness of 5.95 μm was achieved with the Sn–58Bi solder. Furthermore, shear testing revealed that the Sn–58Bi solder joints achieved the peak shear strength of 41.42 MPa, which marked a 72.73 % enhancement over the pure Sn joints.

本研究考察了Bi含量（0、10、20、30、45、58 wt%）对锡基铜基钎料润湿性、熔融特性、微观结构、界面反应和剪切强度的影响。主要研究纯锡焊料向锡铋共晶焊料过渡过程中组织产物和焊料性能的演变，为进一步深入研究和改性强化锡铋系列焊料奠定基础。与纯锡焊料相比，Sn - 58bi焊料的润湿角降低了67.6%，达到9.28°。142.9℃时，峰值温度降低了37.4%。随着Bi含量的增加，金属间化合物（IMC）层厚度呈现先增大后减小的趋势。Sn-58Bi钎料的IMC厚度最小为5.95 μm。剪切试验表明，Sn - 58bi焊点的峰值剪切强度为41.42 MPa，比纯Sn焊点提高了72.73%。

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引用次数: 0

The influence of Al and Y contents on tensile properties of 18Ni–14Cr-(2.5–3.5)al-based stainless steels under thermal aging Al和Y含量对18Ni-14Cr -(2.5-3.5) Al基不锈钢热时效拉伸性能的影响

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.165

Jintao Zhang , Minyan Yang , Dongling Zou , QiQi You , Jiale Huang , Yaxia Wei , Run Yang , Bingsheng Li

The microstructural stability and mechanical performance of alumina-forming austenitic (AFA) steels under prolonged thermal exposure are critical for their application in advanced nuclear energy systems. This study systematically investigates the individual and synergistic effects of aluminum content (2.5 vs. 3.5 wt%) and yttrium microalloying (0.05 wt%) on the tensile properties and microstructural evolution of Fe–18Ni–14Cr–(2.5–3.5)Al-based AFA steels during thermal aging at 500 °C for durations up to 1500 h. Uniaxial tensile tests were conducted from RT to 300 °C. Results demonstrate that increasing Al content from 2.5 wt% to 3.5 wt% significantly enhances strength, primarily attributed to a substantial increase in the volume fraction of B2–NiAl precipitates. The addition of 0.05 wt% Y further refines the grain structure and promotes the precipitation of both B2–NiAl and NbC phases, yielding the highest strength among the studied alloys. However, this strength enhancement is coupled with a pronounced degradation in ductility, particularly after extended aging (1500 h), where the Y-containing alloy exhibited a marked reduction in elongation at 300 °C to 20.3 %. Microstructural analysis reveals that prolonged aging leads to coarsening of B2–NiAl particles and their preferential aggregation at grain boundaries, transitioning the fracture mode from ductile dimple rupture to brittle cleavage. A definitive composition-microstructure-property relationship is established, elucidating the competing mechanisms of precipitation strengthening and over-aging. This work provides vital insights for designing AFA steels with balanced mechanical properties for long-term high-temperature service.

形成铝的奥氏体钢在长时间热暴露下的显微组织稳定性和力学性能对其在先进核能系统中的应用至关重要。本研究系统地研究了铝含量（2.5 wt% vs. 3.5 wt%）和钇微合金化（0.05 wt%）对Fe-18Ni-14Cr - (2.5 - 3.5) al基AFA钢在500℃热时效期间拉伸性能和显微组织演变的单独和协同效应，时效时间长达1500 h。单轴拉伸试验从室温到300℃进行。结果表明，当Al含量从2.5 wt%增加到3.5 wt%时，强度显著提高，这主要是由于B2-NiAl析出物的体积分数大幅增加。添加0.05 wt%的Y进一步细化了晶粒组织，促进了B2-NiAl和NbC相的析出，产生了最高的强度。然而，这种强度的提高伴随着明显的延展性下降，特别是在延长时效（1500 h）之后，含y合金在300°C时伸长率明显下降至20.3%。显微组织分析表明，长时间时效导致B2-NiAl颗粒粗化，晶界处优先聚集，断裂模式由韧性韧窝断裂转变为脆性解理断裂。建立了明确的成分-显微组织-性能关系，阐明了沉淀强化和过时效的竞争机制。这项工作为设计具有长期高温服务平衡力学性能的AFA钢提供了重要的见解。

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引用次数: 0

Achieving isotropy and formability synergy of Mg–2Zn–3Li-1Gd alloy sheet through the introduction of a weak and diffused texture distribution 通过引入弱扩散织构分布，实现Mg-2Zn-3Li-1Gd合金板材的各向同性和成形性协同作用

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.145

Guangjie Xue , Junjie He , Kun Yang , Huijun Hao , Zijian Zhang , Lijun Jia , Hao Zhou , Weiqi Wang , Chen Wang , Kai Xiong , Quan Fu , Debin Shan , Bin Guo

Recently, modifying texture characteristics has been regarded as a key strategy for achieving enhanced mechanical isotropy and excellent formability of Mg alloy sheets. In this work, the Mg–2Zn–3Li-1Gd alloy sheet with weak and diffused texture is successfully prepared via warm rolling (WR) and subsequent annealing, achieving a superior synergy of isotropy and formability (Erichsen value of 7.8 mm) in mechanical properties. Quasi-in-situ electron backscatter diffraction (EBSD) and transmission electron microscopy (TEM) analyses demonstrate that diverse types of dislocations can be activated during the WR process along the transverse direction (TD). During annealing, recrystallized grains exhibit a diverse orientation distribution under the synergistic influence of various dislocations, which facilitates the development of weak and diffused texture. In addition, first-principles calculations have demonstrated that the co-segregation of Zn and Gd at grain boundaries (GB) reduces GB energy and strengthens atomic bonding, which suppresses crack initiation and further improves the formability. The outcomes of this work can provide worthwhile insights for designing formable and ductile Mg alloy sheets, which also offer new perspectives for mitigating planar anisotropy in mechanical behavior.

近年来，改变织构特征已被认为是提高镁合金板材力学各向同性和优异成形性的关键策略。在本研究中，通过热轧（WR）和随后的退火，成功制备了具有弱弥散织构的Mg-2Zn-3Li-1Gd合金板材，实现了各向同性和可成形性的优异协同（Erichsen值为7.8 mm）。准原位电子背散射衍射（EBSD）和透射电子显微镜（TEM）分析表明，在沿横向（TD）的WR过程中可以激活多种类型的位错。退火过程中，在各种位错的协同作用下，再结晶晶粒呈现出不同的取向分布，有利于弱织构和弥散织构的发展。此外，第一性原理计算表明，Zn和Gd在晶界（GB）处的共偏析降低了GB能量，增强了原子键合，抑制了裂纹的萌生，进一步提高了成形性能。本研究结果为设计可成形和延展性的镁合金板材提供了有价值的见解，也为减轻力学行为的平面各向异性提供了新的视角。

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引用次数: 0

Innovative synthesis of compact NiPt coatings on nickel-based GH3535 alloy using liquid sodium: Mechanism revealed by experiments and simulations 用液态钠在镍基GH3535合金上创新合成致密NiPt涂层：实验和模拟揭示机理

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.162

Jiahe Rong , Linbing Jiang , Wenguan Liu , Xinmei Yang , Hefei Huang

The Pt–Ni coating holds great application potential in aerospace, catalysis, and biomedicine. This study developed a novel approach to fabricate dense NiPt coatings on nickel-based GH3535 alloy by immersing the alloy in Pt-doped liquid sodium: Pt first dissolves in liquid sodium, then diffuses to the GH3535 surface and reacts with Ni to form NiPt. Temperature is a critical factor for NiPt coating formation: Pt in sodium starts diffusing to the alloy surface as elemental Pt at 350 °C; temperatures≥500 °C initiate Pt–Ni reactions to form NiPt, but a dense coating requires temperatures≥600 °C, with coatings synthesized at 60–700 °C exhibiting excellent compactness. The coating's crystal structure evolves with immersion time: tetragonal NiPt forms for durations <48 h, while longer times (>48 h) drive its transformation into a face-centered cubic [Ni,Pt] solid solution. Combining first-principles calculations, machine learning-accelerated molecular dynamics, and classical molecular dynamics, the study reveals that Pt atoms in liquid sodium diffuse uniformly onto GH3535 surfaces. Both theoretical and experimental results confirm Pt–Ni interdiffusion at the interface, which generates a [Pt,Ni] solid solution and ensures strong bonding between the coating and the alloy substrate.

Pt-Ni涂层在航空航天、催化、生物医药等领域具有广阔的应用前景。本研究提出了一种将镍基GH3535合金浸入Pt掺杂的液态钠中制备致密NiPt涂层的新方法：Pt首先溶解在液态钠中，然后扩散到GH3535表面，与Ni反应生成NiPt。温度是NiPt涂层形成的关键因素：在350℃时，钠中的Pt开始以元素Pt的形式扩散到合金表面；温度≥500℃会引发Pt-Ni反应形成NiPt，但致密涂层需要温度≥600℃，60-700℃合成的涂层具有优异的致密性。涂层的晶体结构随着浸泡时间的推移而变化：在48小时内形成四方NiPt，而更长的时间（48小时）会使其转变为面心立方[Ni，Pt]固溶体。结合第一性原理计算、机器学习加速分子动力学和经典分子动力学，该研究揭示了液态钠中的Pt原子均匀扩散到GH3535表面。理论和实验结果均证实了Pt - Ni在界面处的相互扩散，形成了[Pt，Ni]固溶体，保证了涂层与合金基体之间的牢固结合。

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引用次数: 0

Strength–ductility synergy in NbTaTiV refractory high-entropy alloy composites via in-situ formation of TiC from NbC addition NbC原位生成TiC对NbTaTiV耐火高熵合金复合材料强度-延性的协同作用

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-16 DOI: 10.1016/j.jmrt.2025.12.125

Mehboob Elahi , M. Imran Ahmed , M. Adil Mehmood , Nadeem Shaukat , Mohsin Saleem , Muhammad Atiq Ur Rehman , Muhammad Ramzan Abdul Karim , Muhammad Aneeq Haq , Khurram Yaqoob

Refractory high-entropy alloys (RHEAs) have emerged as promising candidates for high-temperature structural applications due to their exceptional thermal stability and mechanical performance. However, most RHEAs still face an inherent trade-off between high strength and limited ductility at room temperature. In this work, an alloy design strategy was employed to intentionally induce the in-situ formation of TiC through the decomposition of added NbC within a ductile NbTaTiV matrix, thereby achieving a synergistic enhancement in strength and ductility. NbTaTiV-based RHEAs were first prepared by arc melting under an argon atmosphere, and NbC was subsequently added through arc melting to produce high-entropy composites with varying NbC contents. The added NbC decomposed during melting, leading to the in-situ formation of TiC owing to its more negative free energy of formation than that of NbC, while the released Nb diffused into the solid-solution matrix. As a result, the crystal structure of NbTaTiV transformed from a single body-centered cubic (BCC) phase to a dual-phase (BCC + TiC) microstructure. The volume fraction of TiC increased with increasing NbC content, accompanied by a morphological transition from needle-like to blocky structure. The resulting NbTaTiV high-entropy composites exhibited an outstanding combination of strength and ductility, achieving yield strengths up to 2305 MPa with 10 % fracture strain. These results demonstrate that controlled in-situ carbide formation provides an effective pathway to tailor microstructures and achieve superior mechanical performance in RHEA systems for demanding structural applications.

耐火高熵合金（RHEAs）由于其优异的热稳定性和机械性能，已成为高温结构应用的有希望的候选者。然而，大多数rhea在室温下仍然面临着高强度和有限延展性之间的内在权衡。在这项工作中，采用了一种合金设计策略，通过在韧性NbTaTiV基体中分解添加的NbC，有意地诱导原位形成TiC，从而实现强度和延展性的协同增强。首先在氩气气氛下通过电弧熔化法制备nbtativ基RHEAs，然后通过电弧熔化加入NbC，制备出不同NbC含量的高熵复合材料。添加的NbC在熔融过程中分解，由于其生成自由能比NbC更负，导致原位生成TiC，而释放的Nb扩散到固溶基体中。结果表明，NbTaTiV的晶体结构由单体心立方（BCC）相转变为双相（BCC + TiC）微观结构。TiC的体积分数随着NbC含量的增加而增加，并伴有由针状结构向块状结构的转变。得到的NbTaTiV高熵复合材料具有良好的强度和延展性，在10%的断裂应变下，屈服强度高达2305 MPa。这些结果表明，可控的原位碳化物形成提供了定制微观结构的有效途径，并在要求苛刻的结构应用中实现了优异的机械性能。

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引用次数: 0

Exploring the mechanical behaviors and fracture mechanisms of Sn-0.3Ag-0.7Cu solder alloy across a wide temperature range 探索Sn-0.3Ag-0.7Cu钎料合金在宽温度范围内的力学行为和断裂机理

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-15 DOI: 10.1016/j.jmrt.2025.12.146

Wen Jiang , Changwei Wang , Kangning Han , Kefeng Ye , Yaxin Zhu , Chuantao Hou , Ruisi Xing

The mechanical properties of solder alloys at extreme temperatures are critical for advanced aerospace and telecommunications applications. This study reveals an exceptional strength–ductility synergy in the low-Ag SAC0307 solder alloy at cryogenic temperatures, which contrasts with the typical brittle behavior of many metals. We systematically elucidate the effects of annealing (75 °C and 125 °C) on tensile properties and fracture behavior across a wide temperature range (120 °C to −150 °C). The results show that lowering the temperature to −150 °C simultaneously increases both ultimate tensile strength and ductility. Annealing further enhances this cryogenic ductility. Microstructural analysis indicates that the superior cryogenic performance arises from a shift in the deformation mechanism: from dislocation-dominated plasticity at high temperatures to a synergy of grain refinement, stacking faults, and deformation nanotwins at −150 °C. The interaction among dislocations, stacking faults, and twins forms a multi-level nanostructure that facilitates simultaneous strengthening and toughening. In addition, annealing promotes microstructural homogenization and increases the energy barrier for brittle fracture, suppressing the ductile-to-brittle transition. This work provides a mechanistic understanding of the cryogenic toughness in low-Ag solder alloys and offers guidelines for optimizing their thermomechanical reliability.

焊料合金在极端温度下的机械性能对于先进的航空航天和电信应用至关重要。这项研究揭示了低温下低银SAC0307焊料合金的特殊强度-延展性协同作用，这与许多金属的典型脆性行为形成了对比。我们系统地阐明了退火（75°C和125°C）在宽温度范围（120°C至- 150°C）内对拉伸性能和断裂行为的影响。结果表明，将温度降低至- 150℃时，合金的极限抗拉强度和塑性同时提高。退火进一步提高了这种低温延展性。显微组织分析表明，优异的低温性能源于变形机制的转变：从高温下以位错为主的塑性到- 150℃下晶粒细化、层错和变形纳米孪晶的协同作用。位错、层错和孪晶之间的相互作用形成了多级纳米结构，促进了同时强化和增韧。此外，退火促进了微观组织的均匀化，增加了脆性断裂的能垒，抑制了韧脆转变。这项工作提供了对低银钎料合金低温韧性的机理理解，并为优化其热机械可靠性提供了指导。

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引用次数: 0

The effect of the thermal-shocking influence of laser shock processing without coating on TA15 in simulation and experiment 模拟和实验研究了激光无涂层冲击加工对TA15的热冲击影响

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-15 DOI: 10.1016/j.jmrt.2025.12.138

Yang Yuqi , Li Shijian , Liu Yanmei , Han Peipei , Zhao Liang , Zhao Yan , Lu Ying , Zhao Songnan , Zhao Jibin , Wu Jiajun

Laser shock processing without coating, as a novel and efficient surface modification technology, involves a complex coupling process of thermal ablation and shock process. This paper establishes a simulation model for the thermal–shock coupling effect of laser shock processing without coating. The evolution and distribution of stress in TA15 during the shock process are analyzed, additionally, the distribution of the ablation layer induced by laser radiation is analyzed, and the effects of laser parameters and spot radius on the ablation layer and stress distribution are investigated. The results show that when the laser power intensity is 13.26 GW/cm² and the spot radius is 2 mm, the maximum residual tensile stress is 393.5 MPa, the depth of the tensile stress layer is 75.9 μm, the maximum residual compressive stress is −505.9 MPa, and its depth is 235.2 μm. When the spot radius is 1 mm, the depth of residual tensile stress is the largest at 98.4 μm. When the spot radius is 0.5 mm, the depth of maximum residual compressive stress is the smallest at 147.1 μm. Therefore, after laser shock processing without coating, the material surface needs to be ground off for the ablation layer and heat-affected zone, and the grinding depth is in the range of 98.4–147.1 μm. Based on EBSD analysis and simulation model analysis, this paper proposes a mechanism model for laser shock processing without coating. Under the combined effects of laser radiation, heat transfer, and shock pressure, the distribution pattern of tensile-compressive-tensile stresses is formed in the material surface and subsurface layer, correspondingly, the microstructure evolution represents the transition pattern of the ablation-phase transformation heat-affected zone-strengthened layer.

无涂层激光冲击加工是一种新型、高效的表面改性技术，涉及热烧蚀和冲击过程的复杂耦合过程。建立了无涂层激光冲击加工热-冲击耦合效应的仿真模型。分析了TA15在激波过程中应力的演变和分布，分析了激光辐射诱导的烧蚀层分布，研究了激光参数和光斑半径对烧蚀层和应力分布的影响。结果表明：当激光功率强度为13.26 GW/cm2，光斑半径为2 mm时，最大残余拉应力为393.5 MPa，拉应力层深度为75.9 μm；最大残余压应力为- 505.9 MPa，其深度为235.2 μm；当光斑半径为1 mm时，残余拉应力深度最大，为98.4 μm；当光斑半径为0.5 mm时，最大残余压应力深度为147.1 μm，最小。因此，无涂层激光冲击加工后，材料表面需要磨除烧蚀层和热影响区，磨削深度范围为98.4 ~ 147.1 μm。基于EBSD分析和仿真模型分析，提出了无涂层激光冲击加工的机理模型。在激光辐射、传热和冲击压力的共同作用下，材料表面和亚表层形成了拉-压-拉应力的分布模式，相应的微观组织演变为烧蚀-相变热影响区-强化层的过渡模式。

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引用次数: 0

Evolution of adiabatic shear band in 2000 MPa grade ultrahigh strength steel during high strain rate compression 2000mpa级超高强度钢在高应变率压缩过程中的绝热剪切带演化

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-15 DOI: 10.1016/j.jmrt.2025.12.139

Ruizhe Jin, Jiahao Zhu, Wenchao Yu, Yongming Yan, Jie Shi, Maoqiu Wang

In this work, we employ a Split Hopkinson Pressure Bar (SHPB) to investigate the microstructural evolution and formation mechanism of internal adiabatic shear bands (ASBs) in a 2000 MPa grade ultrahigh strength martensitic steel at high strain rates. Results from dynamic compression tests show that, at a strain rate of 3700 s⁻¹, the critical deformation for the formation of deformed shear bands (dASB) is 20.7 %, while the critical deformation for phase transformed shear bands (tASB) is 26.7 %. The evolution of adiabatic shear bands shows that dASB forms first, while tASB gradually develops within the dASB region and cracks initiate and propagate from within the tASB as strain increases. The experimental steel maintain 5.3 % deformation from the onset of tASB to ultimate failure at 32 %, demonstrating superior deformation capacity at high strain rates. Within the tASB, nano-equiaxed grains with an average diameter of 95 nm were observed. This study combines a modified adiabatic temperature rise model with the rational dynamic recrystallization (RDR) theory to explain their formation. The derived RDR kinetic equation indicates that the time required for dynamic recrystallization is less than the 20 μs duration of the compression process measure from dASB initiation, which confirms the thermodynamic feasibility of nanograin formation within the experimental timeframe.

本文采用分离式霍普金森压杆（SHPB）研究了2000mpa级超高强度马氏体钢在高应变速率下内部绝热剪切带（asb）的微观组织演变和形成机制。动态压缩试验结果表明，在应变速率为3700 s−1时，变形剪切带形成的临界变形量（dASB）为20.7%，相变剪切带形成的临界变形量（tASB）为26.7%。绝热剪切带的演化表明，首先形成dASB，然后在dASB区域内逐渐发展，随着应变的增加，在tASB区域内萌生并扩展裂纹。实验钢从tASB开始到最终失效保持5.3%的变形，达到32%，显示出在高应变率下优越的变形能力。在tASB内，观察到平均直径为95 nm的纳米等轴晶粒。本文将改进的绝热温升模型与合理动态再结晶理论相结合来解释其形成。导出的RDR动力学方程表明，动态再结晶所需的时间小于dASB起始压缩过程测量的20 μs，证实了在实验时间框架内形成纳米颗粒的热力学可行性。

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引用次数: 0

Tribological properties of woven carbon fiber/PEEK composites from ambient to 200 °C: Ultra-low wear and performance evolution 织物碳纤维/PEEK复合材料在室温至200°C下的摩擦学性能：超低磨损和性能演变

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-15 DOI: 10.1016/j.jmrt.2025.12.141

Zheng-Bo Xu , Shu-Qing Kou , Feng Qiu , Liang-Yu Chen , Hong-Yu Yang , Jun-Nan Dai , Shi-Li Shu , Ruifen Guo , Qi-Chuan Jiang , Lai-Chang Zhang

The limited mechanical and tribological stability of carbon fiber reinforced PEEK matrix composites at elevated temperatures remains a major obstacle to their widespread application in extreme service environments. In this work, stain-woven carbon fiber (60 wt%) reinforced PEEK composite (CP60) was fabricated via compression molding, and its temperature-dependent mechanical and wear performance was systematically evaluated. Friction and wear behavior were systematically investigated using pin-on-disc tests under dry sliding conditions. Experiments were conducted at two distinct temperatures (room temperature (RT) and 200 °C) with diverse loads (200–400 N) and sliding velocities (0.47 and 0.94 m/s). The composite exhibited lower average friction coefficients (0.16–0.41) and moderate wear resistance property ((4.23–6.72) × 10⁻⁷ mm³/Nm) at RT. At 200 °C, CP60 demonstrated increased average friction coefficients (0.18–0.56) and wear rate ((5.72–10.8) × 10⁻⁷ mm³/Nm), respectively. At RT, the wear mechanism was primarily abrasive, where debris shed from the surface interacted with the contact surface, gradually forming a friction transfer film. However, at 200 °C, the wear mechanism transitioned to adhesive wear, as the PEEK matrix softened and adhered to the counterface, destabilizing the transfer film and intensifying wear. Compared to other polymer-based materials and lightweight alloys such as Mg or Al, CP60 exhibits a relatively lower specific wear rate (wear rate-to-density ratio), highlighting its unique advantage in lightweight systems that require a balance of tribo-mechanical performance. This study achieves a trade-off between high fiber loading and brittleness. It provides valuable insights into the development and use of polymer composites in tribological systems exposed to elevated temperatures.

碳纤维增强PEEK基复合材料在高温下有限的机械和摩擦学稳定性仍然是其在极端服务环境中广泛应用的主要障碍。在这项工作中，通过压缩成型制备了染色编织碳纤维（60% wt%）增强PEEK复合材料（CP60），并系统地评估了其温度相关的机械和磨损性能。在干滑动条件下，使用销盘试验系统地研究了摩擦和磨损行为。实验在两种不同温度（室温和200℃）、不同载荷（200 - 400 N）和不同滑动速度（0.47和0.94 m/s）下进行。复合材料在室温下具有较低的平均摩擦系数（0.16-0.41）和中等的耐磨性（（4.23-6.72）× 10−7 mm3/Nm）。在200°C时，CP60的平均摩擦系数（0.18-0.56）和磨损率（（5.72-10.8）× 10−7 mm3/Nm）分别增加。在RT下，磨损机制主要是磨料磨损，从表面脱落的碎屑与接触面相互作用，逐渐形成摩擦转移膜。然而，在200℃时，磨损机制转变为粘合磨损，因为PEEK基体软化并粘附在表面上，破坏了转移膜的稳定并加剧了磨损。与其他聚合物基材料和轻量化合金（如Mg或Al）相比，CP60具有相对较低的比磨损率（磨损率与密度比），突出了其在需要平衡摩擦机械性能的轻量化系统中的独特优势。这项研究实现了高纤维负荷和脆性之间的权衡。它为高温摩擦系统中聚合物复合材料的开发和使用提供了有价值的见解。

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