Journal of Materials Research and Technology-Jmr&t最新文献

英文中文

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01

引用次数: 0

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01

引用次数: 0

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01

引用次数: 0

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01

引用次数: 0

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01

引用次数: 0

Morphology, mechanical properties, and environmental impact of long glass fiber-reinforced polypropylene foams 长玻璃纤维增强聚丙烯泡沫的形态、机械性能和环境影响

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.175

Javier Gómez-Monterde , Jörg Hain , Miguel Sánchez-Soto , Maria Lluisa Maspoch

This work evaluates the morphology, mechanical performance, and environmental impact of polypropylene composites reinforced with long glass fibers and processed via conventional injection molding, MuCell and Ku-Fizz foaming technologies, combined with the Core Back cavity expansion technique. SEM and micro-CT analyses reveal the characteristic skin-core cellular structures, with fine and uniformly distributed cells ranging from 5 to 250 μm in size and an enhanced cell density with mold expansion on the order of 10⁶ cells·cm⁻³.

Due to the reduction in the load-bearing area, tensile, flexural, and impact properties decrease with the density, mitigated by substantial reinforcement from long fibers. Specific properties maintain comparable to solid materials in the direction of preferential fiber alignment. The combined effect of mold expansion and fiber reinforcement in the foamed materials results in flexural stiffness up to 50 % higher than that of the solid counterparts. Complementary life cycle assessment reveals significant environmental benefits of both foaming technologies over conventional injection molding due to material savings and energy efficiency gains, with a reduction in environmental impact around 17 %. The study highlights the industrial applicability of these composite foams manufactured by advanced microcellular injection molding as promising candidates for lightweight, high-performance, and environmentally responsible industrial applications.

本研究评估了用长玻璃纤维增强的聚丙烯复合材料的形态、机械性能和环境影响，并通过传统的注射成型、MuCell和Ku-Fizz发泡技术，结合芯后腔膨胀技术进行加工。SEM和micro-CT分析显示了典型的皮核细胞结构，细胞尺寸为5 ~ 250 μm，分布均匀，细胞密度随霉菌膨胀而增加，约为106个细胞·cm−3。由于承载面积的减少，拉伸、弯曲和冲击性能随着密度的增加而降低，通过长纤维的大量增强来缓解。在优先的纤维排列方向上，特定的性能保持与固体材料相当。泡沫材料中的模具膨胀和纤维增强的共同作用使其抗弯刚度比固体材料高出50%。互补的生命周期评估显示，由于节省材料和提高能源效率，这两种发泡技术都比传统注塑成型具有显著的环境效益，对环境的影响减少了17%左右。该研究强调了这些由先进微孔注塑成型制造的复合泡沫的工业适用性，作为轻质、高性能和环保工业应用的有前途的候选者。

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引用次数: 0

Research on the mechanisms for enhancing strength and toughness in 1000 MPa hydroelectric steel influenced by V elements V元素对1000mpa水电钢增强强度和韧性的影响机理研究

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.234

Yue Liu , Wujie Yang , Peng Zhang , Xiaoshu Wang , Zhinan Yang , Fucheng Zhang

This research aims to enhance the characteristics of hydroelectric steel with a grade of 1000 MPa by examining how varying vanadium (V) levels (0, 0.05 %, 0.09 %) influence its microstructure and mechanical attributes. Through the implementation of specific rolling techniques and heat treatment processes, microstructural analysis was conducted using optical and scanning electron microscopy, while mechanical performance was assessed via tensile and impact testing. Findings reveal that both tensile and yield strengths show a marked increase with higher V concentrations, although elongation initially declines before rising again. The enhancement in yield strength is mainly attributed to the strengthening of grain boundaries and precipitation effects. At lower temperatures, the impact energy first rises and then falls as V content increases. Steel with 0.05 % V demonstrated the best low-temperature toughness, recording impact energies of 201 J at −40 °C and 186 J at −60 °C. On a microstructural scale, vanadium and carbon combine to create fine VC carbides that restrict martensite development, refine grain structures, and enhance the density of dislocations. The primary precipitation phase identified is the ternary (Nb, V, Ti)C, with the strengthening mechanism transitioning from being dominated by Nb pinning to V dispersion strengthening, resulting in effective precipitation hardening. Additionally, raising the V content to 0.05 % leads to significant changes in the Compact Precipitate (CP) group, increasing the amount of bainite present. The differing frequencies of bainite in these groups can be interpreted as high-angle grain boundary dislocations (HAGBs), which improve crack resistance and overall toughness.

本研究旨在通过研究不同钒(V)含量（0、0.05%、0.09%）对其显微组织和力学属性的影响，提高1000 MPa等级水电钢的性能。通过实施特定的轧制技术和热处理工艺，使用光学和扫描电子显微镜进行微观组织分析，同时通过拉伸和冲击测试评估机械性能。结果表明，随着V浓度的升高，拉伸强度和屈服强度均显著增加，但伸长率先下降后上升。屈服强度的提高主要是由于晶界的强化和沉淀效应。在较低温度下，随着V含量的增加，冲击能量先上升后下降。添加0.05% V的钢表现出最好的低温韧性，在- 40°C和- 60°C时的冲击能分别为201 J和186 J。在微观结构尺度上，钒和碳结合形成了精细的VC碳化物，限制了马氏体的发展，细化了晶粒结构，提高了位错密度。初生析出相为三元（Nb， V, Ti）C，强化机制由Nb钉钉为主转变为V弥散强化，形成有效的析出硬化。另外，当V含量提高到0.05%时，致密相（CP）组发生了显著变化，贝氏体的数量增加。这些组中贝氏体的不同频率可以解释为高角度晶界位错（HAGBs），从而提高了抗裂性和整体韧性。

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引用次数: 0

Multiscale crystal structure dependence of quasi-static and low-velocity impact resistance of glass fiber reinforced polypropylene composites 玻璃纤维增强聚丙烯复合材料准静态和低速抗冲击性能的多尺度晶体结构依赖性

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.169

Wenjun Fang , Zijie Chen , Jia Chen , Jingxian Wu , Shuhan Di , Jinhua Wu , Long Liu , Jian Liu , Weiwei Li , Nengru Tao , Qing Li

Thermoplastic continuous glass fiber reinforced polypropylene (CGF/PP_m) composites are promising next-generation structural materials, prized for their lightweight nature and recyclability. Critically, the mechanical properties of these composites can be substantially enhanced by tailoring the crystallization behavior of the polypropylene matrix. However, the stress transmission mechanism mediated by the multi-scale crystalline architecture (e.g., spherulites, lamellae) under quasi-static and low-velocity impact conditions remains insufficiently elucidated. Thus, this paper parses the crystallization kinetics and micron/nano-scale structural parameters to establish a coupling relationship between the cooling process, the resultant crystal structure, and the macroscopic mechanical properties. Then, the underlying regulatory mechanism through which a specific microcrystalline structure dominates stress transfer and energy dissipation is revealed. Results show under a high-energy impact of 75 J, the impact resistance of CGF/PP_m prepared at low supercooling was improved by 45.1 % compared with that prepared at high supercooling, and no perforation damage occurred. Large spherulite size with reduced deformation deflection, thick lamellae and low size distribution of crystallites, and spherulite boundary effects that induce lateral propagation of normal impact force are found to be the main elements that dominate the mechanical properties at low cooling rate. This work may pave the way for improving mechanical properties of thermoplastic composites via generating specific crystalline structures.

热塑性连续玻璃纤维增强聚丙烯（CGF/PPm）复合材料是有前途的下一代结构材料，其轻量化和可回收性备受推崇。关键的是，这些复合材料的机械性能可以通过调整聚丙烯基体的结晶行为而大大提高。然而，在准静态和低速冲击条件下，多尺度晶体结构（如球晶、片层）介导的应力传递机制尚未得到充分阐明。因此，本文分析了结晶动力学和微米/纳米尺度的结构参数，建立了冷却过程、所得晶体结构和宏观力学性能之间的耦合关系。然后，揭示了特定微晶结构主导应力传递和能量耗散的潜在调控机制。结果表明：在75 J的高能冲击下，低过冷条件下制备的CGF/PPm的抗冲击性能比高过冷条件下制备的CGF/PPm提高了45.1%，且未发生穿孔损伤；大的球晶尺寸和小的变形挠度，厚的片层和小的晶粒分布，以及诱导法向冲击力横向传播的球晶边界效应是在低冷却速率下决定力学性能的主要因素。这项工作可能为通过产生特定的晶体结构来改善热塑性复合材料的机械性能铺平道路。

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引用次数: 0

Micromechanical properties and deformation damage behaviors of SiCp/Al composites using cryogenic indentation technique 低温压痕技术制备SiCp/Al复合材料的微观力学性能及变形损伤行为

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.190

Zhaoxin Wang , Maoning Zhang , Ming Li , Xing Li , Lijia Li , Hongwei Zhao

SiC particles-reinforced aluminum matrix (SiCp/Al) composites have been widely used in aerospace science and engineering fields. Nevertheless, the evolution of mechanical properties and deformation behaviors at cryogenic temperatures remains unclear, which still limits their manufacturing process and applications. In this paper, indentation responses of SiCp/Al composites were systematically investigated using instrumented grid indentation at room and cryogenic temperatures. According to the image processing technology of microstructure and statistical analysis of multi-modal Gaussian distribution functions, a novel method is developed that accounts for both particle properties and grid indentation spacing. Additionally, this work reveals a remarkable effect of the cryogenic environment on micromechanical properties and deformation behaviors during indentation. The results indicate that the elastic moduli increase by 12.67 % for SiC particles and 55.22 % for the 6092 aluminum matrix with the temperature decreasing from room temperature to −150 °C. The composites exhibit remarkable weakness in wear resistance below −100 °C, which is mainly attributed to the coupling effect of thermal contraction mismatch (∼0.00245) and indentation-induced reaction stress for SiCp/Al composites. This work may provide more in-depth thoughts on the evolution of micromechanical properties at cryogenic temperatures.

SiC颗粒增强铝基（SiCp/Al）复合材料在航空航天科学与工程领域有着广泛的应用。然而，低温下的力学性能和变形行为的演变尚不清楚，这仍然限制了它们的制造工艺和应用。本文系统地研究了SiCp/Al复合材料在室温和低温下的压痕响应。根据微结构图像处理技术和多模态高斯分布函数的统计分析，提出了一种同时考虑粒子特性和网格压痕间距的新方法。此外，本研究还揭示了低温环境对压痕过程中微观力学性能和变形行为的显著影响。结果表明：从室温到- 150℃，随着温度的降低，SiC颗粒的弹性模量增加了12.67%，6092铝基体的弹性模量增加了55.22%；在- 100℃以下，SiCp/Al复合材料表现出明显的耐磨性弱，这主要是由于SiCp/Al复合材料的热收缩失配（~ 0.00245）和压痕引起的反应应力的耦合效应。这项工作可能为低温下微力学性能的演变提供更深入的思考。

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引用次数: 0

Oxidation behavior of Al2O3-dispersion-strengthened MCrAlY bond coat at 1100 °C al2o3 -弥散强化MCrAlY粘结层在1100℃下的氧化行为

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.180

Yilong Sun , Yuwei Liang , Chen Hua , Zijie Yang , liang Xu , Chenghui Su , Ziyi Zhou , Xiping Xiong , Mingzhang Li , Yijin Xiong , Taihong Huang , Peng Song

To achieve a lower oxidation rate and a longer service life, we fabricated an oxide-dispersion-strengthened MCrAlY(M = Co and/or Ni)bond coat with alumina as the dispersion phase. The oxidation behavior of free-standing CoNiCrAlY bond coats prepared by high-velocity oxygen-fuel (HVOF) spraying were studied, using alumina-dispersion-strengthened (ADS) powder and conventional powder (Non-ADS). The microstructure and composition of the materials were analyzed by SEM, TEM, FIB, XRD, EDS, etc. Thermogravimetric experiments indicated that a lower oxidation rate for the ADS bond coat compared to the conventional one that conducted in air at 1100 °C. Microscopic analysis shows that the alumina scale formed on the surface of the ADS bond coat is uniform, and there is no large obvious segregation phase formed in the alumina scale. Alumina scale is composed of equiaxed crystals on the outside and columnar crystals on the inside. For the non-ADS bond coat, the alumina scale presents a typical internally grown columnar crystal structure, but large segregation phases enriched with reactive elements in the alumina scale. The result analysis shows that the ADS bond coat with 2 wt % alumina has the lowest oxidation rate, which is 30 % lower than that of non-ADS. Due to the presence of the dispersed phases, the rapid diffusion of the reactive element Y is inhibited. This work discusses the influence of different contents of dispersed phases on the oxidation resistance of bond coat, and obtaining an outstanding service life.

为了获得较低的氧化速率和较长的使用寿命，我们制备了一种以氧化铝为分散相的氧化分散强化MCrAlY（M = Co和/或Ni）结合层。采用氧化铝分散增强（ADS）粉末和常规粉末（Non-ADS），研究了高速氧燃料（HVOF）喷涂制备的独立式CoNiCrAlY粘结层的氧化行为。采用SEM、TEM、FIB、XRD、EDS等分析了材料的微观结构和组成。热重实验表明，与传统的在1100℃空气中进行的涂层相比，ADS涂层的氧化速率更低。显微分析表明，ADS结合层表面形成的氧化铝垢是均匀的，氧化铝垢中没有形成明显的大偏析相。氧化铝鳞片由外部等轴晶和内部柱状晶组成。对于非ads结合层，氧化铝垢呈现典型的内生长柱状晶体结构，但在氧化铝垢中存在大量富集活性元素的偏析相。结果分析表明，含2 wt %氧化铝的ADS结合层氧化率最低，比不含ADS结合层氧化率低30%。由于分散相的存在，抑制了活性元素Y的快速扩散。本文讨论了不同分散相含量对粘结层抗氧化性能的影响，从而获得优异的使用寿命。

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