Journal of Materials Research and Technology-Jmr&t最新文献_第3页

Evaluation of corrosion resistance of steel alloys in ternary molten salt: implications for TES and industrial heat applications 评价钢合金在三元熔盐中的耐腐蚀性：对TES和工业热应用的影响

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-01-01 DOI: 10.1016/j.jmrt.2025.12.222

M. Carmen Pavón-Moreno , Antonio Lopez-Paneque , Antonio Paul , Jose María Gallardo , Cristina Prieto

Several steel alloys were evaluated for their corrosion resistance in ternary molten salt (NaNO₃–KNO₃–NaNO₂, 53-40-7 wt%) at 400 °C under an air atmosphere, with a focus on thermal energy storage (TES) and industrial heat applications. Alloys A335-P11, SS321, A213-T11, A516-Gr70, and A387-Gr11 were tested using static immersion in accordance with ASTM G31 over exposure periods of 1000, 2000, and 4000 h. Corrosion rates derived from mass loss measurements revealed significant differences among the alloys. SS321 demonstrated the best resistance, with stable chromium-rich oxide scales and rates consistently below 4 μm/year. In contrast, A335-P11 exhibited the highest corrosion rate, with an initial rate of 65 μm/year that decreased to 18 μm/year over time, associated with thick, cracked oxide scales and localized internal attack. The remaining alloys showed intermediate corrosion behavior. SEM/EDS analyses confirmed the critical role of chromium enrichment in improving corrosion resistance. In parallel, mechanical integrity assessments showed no evidence of stress corrosion cracking or severe crevice corrosion, underscoring the predominance of generalized oxidation as the governing degradation mode. These results provide critical insights for predictive corrosion modeling and support the selection of durable materials for reliable, long-term operation in molten salt-based industrial thermal systems, thereby contributing to the transition toward more sustainable high-temperature heat applications.

在400°C的空气环境下，对几种钢合金在三元熔盐（NaNO3-KNO3-NaNO2, 53-40-7 wt%）中的耐腐蚀性进行了评估，重点是热能储存（TES）和工业热应用。合金A335-P11， SS321, A213-T11， A516-Gr70和A387-Gr11按照ASTM G31在1000,2000和4000小时的暴露时间下进行静态浸泡测试。由质量损失测量得出的腐蚀速率显示了合金之间的显着差异。SS321表现出最好的耐蚀性，具有稳定的富铬氧化层，速率始终低于4 μm/年。A335-P11的腐蚀速率最高，初始腐蚀速率为65 μm/年，随着时间的推移，腐蚀速率降至18 μm/年，腐蚀速率与氧化膜厚、开裂和局部内腐蚀有关。其余合金表现为中等腐蚀行为。SEM/EDS分析证实了富铬对提高耐蚀性的关键作用。同时，机械完整性评估显示没有应力腐蚀开裂或严重缝隙腐蚀的证据，强调了普遍氧化作为主导降解模式的优势。这些结果为预测腐蚀建模提供了重要见解，并为熔盐基工业热系统中可靠、长期运行的耐用材料的选择提供了支持，从而有助于向更可持续的高温热应用过渡。

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引用次数: 0

CALPHAD-based alloy design and strength prediction of high-performance steels under QLT processing 基于calphad的高性能钢QLT加工合金设计与强度预测

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.2025.12.193

Wenhao Zhou , Xinyu Zhang , Ming Fan , Zhongwen Wu , Qing Peng , Haitao Zhao , Junheng Gao , Honghui Wu , Chaolei Zhang , Shuize Wang

A predictive alloy design strategy integrating CALPHAD-based thermodynamics and hardness modeling was developed to design high-performance steels processed via quenching–lamellarization–tempering (QLT). Traditional empirical optimization of QLT steels requires extremely precise temperature control, which limits industrial scalability. In this study, a quantitative composition–strength prediction model was established by combining thermodynamic calculations with a dual-phase hardness model incorporating tempered martensite and intercritical ferrite. The model successfully predicts tensile strength with an error below 10 %, identifying carbon, silicon, and manganese as key strengthening elements, while silicon uniquely broadens the intercritical annealing temperature window. Guided by this model, an optimized steel composition was designed and experimentally validated, achieving yield strength above 820 MPa, tensile strength above 1000 MPa, and Charpy impact energy exceeding 120 J at −40 °C. The results confirm the capability of the model to ensure robust mechanical performance under realistic process variations, enabling reliable industrial application of QLT processing. This integrated computational–experimental framework provides a practical and efficient pathway for composition optimization of high-performance steels, promoting the transition of alloy design from empirical trial-and-error toward predictive, data-driven methodology.

提出了一种基于calphad热力学和硬度建模相结合的预测合金设计策略，用于设计淬火-层化-回火（QLT）工艺的高性能钢。传统的QLT钢的经验优化需要极其精确的温度控制，这限制了工业的可扩展性。在本研究中，将热力学计算与含回火马氏体和临界间铁素体的双相硬度模型相结合，建立了定量的成分强度预测模型。该模型成功地预测了抗拉强度，误差低于10%，确定了碳、硅和锰是关键的强化元素，而硅独特地拓宽了临界退火温度窗口。在此模型的指导下，设计并实验验证了优化后的钢成分，在- 40°C条件下，屈服强度大于820 MPa，抗拉强度大于1000 MPa， Charpy冲击能大于120 J。结果证实了该模型在实际工艺变化下确保稳健机械性能的能力，从而实现了QLT加工的可靠工业应用。这种集成的计算-实验框架为高性能钢的成分优化提供了实用而有效的途径，促进了合金设计从经验试错向预测、数据驱动方法的转变。

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引用次数: 0

BN interface in SiC/SiC composites: A review on structural characteristics, service failure mechanisms, and optimization strategies SiC/SiC复合材料中BN界面：结构特征、使用失效机制及优化策略综述

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.2025.11.196

Rui Lv , Zhuolin Li , Yucong Wei , Fang Ye , Chuchu Guo , Laifei Cheng , Tao Ding

In silicon carbide fiber-reinforced silicon carbide (SiC/SiC) composites, the boron nitride (BN) interface is critical for load transfer and toughening, yet its performance is governed by the interplay between microstructure and service environment. This review systematically examines the structural characteristics and failure mechanisms of the BN interface across a wide temperature range. Key optimization strategies are thoroughly discussed, focusing on interface engineering, matrix modification, and system-level integration with environmental barrier coatings (EBCs) for enhanced protection. Finally, promising research directions are outlined to guide future developments toward durable and reliable SiC/SiC composites under extreme conditions.

在碳化硅纤维增强碳化硅（SiC/SiC）复合材料中，氮化硼（BN）界面是载荷传递和增韧的关键，但其性能受微观结构和使用环境的相互作用决定。本文系统地研究了宽温度范围内氮化硼界面的结构特征和失效机制。深入讨论了关键的优化策略，重点是界面工程、基体改性和与环境屏障涂层（EBCs）的系统级集成，以增强保护。最后，展望了未来SiC/SiC复合材料在极端条件下耐用、可靠的研究方向。

引用次数: 0

Powder-bed Fusion additive manufacturing of 316L stainless steel using short-wavelength diode point melting 采用短波长二极管点熔的316L不锈钢粉末床熔合增材制造

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.2025.12.214

S. Can Erman , Alkim Aydin , Kamran Mumtaz

Diode Point Melting (DPM) is an alternative additive manufacturing powder-bed melting approach that combines multiple low-power, short-wavelength lasers into a single spot that is raster-scanned by an XY gantry to selectively melt deposited powder. In this study, the DPM laser head is composed of eight 450 nm diodes (∼35 W total) focused to ∼100 × 150 μm and is used to fabricate 316L stainless steel. Parts achieve >98 % relative density while operating at slower scan speeds and estimated lower cooling rates than Laser Powder Bed Fusion (LPBF) (≈6.66 × 10⁴ K s⁻¹ vs ∼10⁷ K s⁻¹). The DPM microstructure is distinguished by larger grains (∼18 μm) and larger cellular sub-grains (∼2 μm) relative to the typical LPBF of 316L. It was demonstrated that cellular size decreases with increasing scan speed, evidencing cooling-rate control of the sub-grain structure. Mechanical characterisation shows a modest reduction in elastic modulus and Vickers hardness compared with LPBF-processed 316L, attributed to grain coarsening and slightly higher porosity, while values remain above those of conventionally manufactured 316L. These findings demonstrate potential for DPM to be a low-cost and accessible alternative to LPBF with unique microstructural characteristics.

二极管点熔化（DPM）是一种替代的增材制造粉末床熔化方法，它将多个低功率、短波长的激光器组合到一个点上，由XY龙门光栅扫描，以选择性地熔化沉积的粉末。在这项研究中，DPM激光头由8个450 nm二极管（总计约35 W）组成，聚焦到约100 × 150 μm，用于制造316L不锈钢。零件在较慢的扫描速度下实现98%的相对密度，并且估计冷却速率低于激光粉末床熔化（LPBF）（≈6.66 × 104 K s−1 vs ~ 107 K s−1）。与典型的316L LPBF相比，DPM的微观结构具有较大的晶粒（~ 18 μm）和较大的细胞亚晶粒（~ 2 μm）。结果表明，随着扫描速度的增加，晶胞尺寸减小，表明冷却速度对亚晶结构有控制作用。力学特性表明，与lpbf加工的316L相比，弹性模量和维氏硬度略有降低，这是由于晶粒变粗和孔隙率略高，而这些数值仍然高于传统制造的316L。这些发现表明，DPM具有独特的微观结构特征，是LPBF的低成本和可获得的替代品。

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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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引用次数: 0

Hard-phase intensification by SiO2 nanoparticles for dislocation-mediated Mg supersaturation and tunable corrosion in Fe–Mg alloys 二氧化硅纳米颗粒强化位错介导的Mg过饱和和Fe-Mg合金的可调腐蚀

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.2025.12.170

Chongxian He , Guochao Wu , Wenjing Yang , Youwen Yang , Xiong Shuai , Cijun Shuai

The development of Fe-based biodegradable implants is constrained by the inherently slow degradation rate. One promising approach to accelerate degradation is alloying with Mg to enhanced corrosion susceptibility via forming Mg-containing solid solutions, but the inherent immiscibility between Fe and Mg limit achievable supersaturation. In this work, SiO₂ nanoparticles were introduced into Fe–Mg composite powders during mechanical alloying (MA), followed by laser powder bed fusion fabrication of implants. Results indicate that SiO₂ acts as a hard-phase intensifier to enhance alloying efficacy through intensified energy transmission and dissipation. This process induces severe plastic deformation, promoting dislocation-mediated lattice distortion within the Fe matrix and thereby extending metastable Mg supersaturation beyond conventional MA limitations. The resultant supersaturated solid solution induces a cathodic shift in the electrode potential, increasing the electrochemical driving force for corrosion. Furthermore, SiO₂ nanoparticles exhibit hydroxyl-competitive adsorption at the metal-electrolyte interface, disrupting passivation by forming structurally defective Fe(OH)₃/SiO₂ hybrid composites. This surface reconstruction mechanism reduces the protective capacity of the corrosion products, and enables sustained degradation kinetics with the corrosion rate maintained at 0.25 mm/year over 28 days.

铁基生物可降解植入物的发展受到其固有的缓慢降解速率的限制。加速降解的一种有希望的方法是通过形成含Mg固溶体来与Mg合金化以增强腐蚀敏感性，但铁和Mg之间固有的不混溶限制了可实现的过饱和。在机械合金化（MA）过程中，将SiO2纳米颗粒引入到Fe-Mg复合粉末中，然后采用激光粉末床熔合法制备植入物。结果表明，SiO2作为硬相增强剂，通过强化能量的传递和耗散，提高合金的合金化效率。这一过程引起了严重的塑性变形，促进了铁基体中位错介导的晶格畸变，从而扩展了亚稳Mg过饱和，超出了传统MA的限制。由此产生的过饱和固溶体引起电极电位的阴极位移，增加了腐蚀的电化学驱动力。此外，SiO2纳米颗粒在金属-电解质界面表现出羟基竞争性吸附，通过形成结构缺陷的Fe(OH)3/SiO2杂化复合材料破坏钝化。这种表面重建机制降低了腐蚀产物的保护能力，并实现了持续的降解动力学，腐蚀速率在28天内保持在0.25 mm/年。

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引用次数: 0