Journal of Materials Research and Technology-Jmr&t最新文献_第10页

Microstructure, mechanical and tribological properties of W–AlFeCoCrNi2.1 composites fabricated by laser direct energy deposition 激光直接能量沉积制备w - alfeccrni2.1复合材料的显微组织、力学和摩擦学性能

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-12 DOI: 10.1016/j.jmrt.2025.12.129

Zhaoyang Liu , Tao Zou , Tiannan Mai

Micron W particle reinforced W–AlFeCoCrNi_2.1 composites were additively prepared by laser direct energy deposition (LDED). The effect of W particle content on microstructure, mechanical and tribological properties of the W–AlFeCoCrNi_2.1 composites was studied. The results showed that the W particles partially dissolve in the AlFeCoCrNi_2.1 matrix, not only generating μ nanogranules at the phase interface of the FCC/BCC lamellas but also inducing the formation of the BCC-dominated flower-like structures. The heterogeneous distribution of the remained W particles results in the anisotropy of tensile properties. The tensile properties along the horizontal direction are better than that along the vertical direction. Planes with the densest W particles preferentially act as the easy-path of fracture. Owing to the synergistic effects of the solution strengthening of the matrix, precipitation strengthening of the μ nanogranules and phase strengthening of the BCC phase, along with the load-bearing strength of the W particles, the increasing W particle content improves the microhardness but deteriorates the tensile properties. The wear resistance is significantly improved by the increasing W particle content, attributed to the improvement of the hardness and the restriction of microcracks formation and oxide flakes spalling by the μ nanogranules and adhered W particles. The friction coefficient and wear rate achieve the minimum values of 0.75 and 4.36 × 10⁻⁵ mm³/(N⋅m), respectively.

采用激光直接能量沉积法制备了微米W粒子增强W - alfecocrni2.1复合材料。研究了W颗粒含量对W - alfeccrni2.1复合材料显微组织、力学性能和摩擦学性能的影响。结果表明，W颗粒部分溶解于AlFeCoCrNi2.1基体中，不仅在FCC/BCC薄片的相界面处形成μ纳米颗粒，而且诱导形成以BCC为主的花状结构。残余W颗粒的非均匀分布导致了拉伸性能的各向异性。沿水平方向的拉伸性能优于沿垂直方向的拉伸性能。W颗粒密度最大的面优先表现为易断裂路径。由于基体的固溶强化、μ纳米颗粒的析出强化和BCC相的相强化的协同作用，随着W颗粒承载强度的提高，W颗粒含量的增加提高了显微硬度，但降低了拉伸性能。随着W颗粒含量的增加，合金的耐磨性得到了显著提高，这主要是由于μ纳米颗粒和附着的W颗粒提高了合金的硬度，抑制了微裂纹的形成和氧化片的剥落。摩擦系数和磨损率分别达到最小值0.75和4.36 × 10−5 mm3/（N·m）。

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引用次数: 0

The effect of varying powder feedstock chemistry and printing atmosphere on the microstructure of additively manufactured nickel-based ODS alloys: Role on stabilization of cellular structures vs. oxide dispersion formation 不同的粉末原料化学和印刷气氛对增材制造的镍基ODS合金微观结构的影响：细胞结构稳定与氧化物分散形成的作用

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-12 DOI: 10.1016/j.jmrt.2025.12.050

Matthew deJong , Sourabh Saptarshi , Iver Anderson , Jennifer Forrester , Saul Lapidus , Timothy Horn , Djamel Kaoumi

Nickel-based alloys have a wide variety of structural applications due to their high corrosion resistance and mechanical strength which depend on solid solution strengthening, or the formation of oxides and/or intermetallic precipitation for their properties. In this study, the microstructure of six Ni–Cr–Y–Ti–Al powder batches designed for the production of oxide dispersion strengthened nickel were compared. These batches varied in chemistry and atomization technique used which included Gas Atomization Reactive Synthesis (GARS). The batches of powder were then consolidated via Additive Manufacturing (AM) Powder Bed Fusion using Laser Beam (PBF-LB) and characterized via transmission electron microscopy to elucidate the influence of powder feedstock (i.e. synthesis methodology and chemistry) on the PBF-LB microstructure. The study investigates (i) how the amount of yttrium and titanium additions in the powder feedstock and the addition of oxygen during the processing (through GARS) affect the microstructure of the powder itself and the AM printed microstructure, and (ii) how the control of oxygen addition in the printing atmosphere during the PBF-LB printing process itself is another important parameter for achieving the formation of the wanted oxide dispersion versus the stabilization of the cellular structure (often observed in AM processed alloys). Microstructural characterization of both powder particles and additively manufactured nickel alloys in this study provide important insights into the movement of yttrium within the material upon solidification, particularly along cell boundaries, and how yttrium behaves depending on alloy chemistry. When a threshold of yttrium content is reached within the system, yttrium consistently reacts to form an intermetallic along cell boundaries instead of forming oxide nanoparticles.

镍基合金由于其高耐腐蚀性和机械强度而具有广泛的结构应用，这取决于其性能的固溶体强化或氧化物的形成和/或金属间析出。在本研究中，比较了设计用于生产氧化物分散强化镍的6批Ni-Cr-Y-Ti-Al粉末的显微组织。这些批次在化学和所用的雾化技术上各不相同，其中包括气体雾化反应合成（GARS）。然后，通过激光光束（PBF-LB）的增材制造（AM）粉末床熔合（粉末床熔合）对这些粉末进行固化，并通过透射电子显微镜对其进行表征，以阐明粉末原料（即合成方法和化学）对PBF-LB微观结构的影响。该研究调查了(i)粉末原料中钇和钛的添加量以及加工过程中氧的添加（通过GARS）如何影响粉末本身的微观结构和AM打印的微观结构；以及（ii）在PBF-LB打印过程中，如何控制打印大气中的氧添加量是实现所需氧化物分散形成与细胞结构稳定的另一个重要参数（通常在AM加工合金中观察到）。在本研究中，粉末颗粒和增材制造的镍合金的微观结构表征为材料凝固时钇的运动提供了重要的见解，特别是沿着细胞边界，以及钇的行为如何取决于合金化学。当系统内的钇含量达到阈值时，钇会沿着电池边界持续反应形成金属间化合物，而不是形成氧化物纳米颗粒。

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引用次数: 0

Simulation of temperature on the wettability behavior of diamond/Cu-based filler alloys during brazing process 钎焊过程中温度对金刚石/ cu基填充合金润湿性的影响

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-12 DOI: 10.1016/j.jmrt.2025.12.117

Hu Yang , Guoqin Huang , Yangli Xu , Wenhan Zeng , Xipeng Xu

Ordered arrangement brazed diamond tools offer enhanced machining efficiency by enabling controlled distribution and exposure height of diamond. However, during the brazing process, variations in process parameters can affect the wettability between the brazing alloy and diamond, resulting in different brazing morphologies. In this study, a computational fluid dynamics (CFD)-based brazing simulation model was built to investigate the effects of temperature and heating rate on exposure height of Cu–20Sn–10Ti alloy and displacement of diamond. The simulation and experimental results both demonstrate that with the increase of temperature, the exposure height of diamond decreases gradually, while the change of particle spacing increases due to excessive wetting. With the increase of heating rate, the exposure height increases first and then decreases, while the change of particle spacing is opposite. The brazing alloy undergoes three stages: solid state, solid-liquid coexistence state and complete liquid state. In the complete liquid state stage, the wettability behavior between alloy and diamond significantly impacts capillary force and interfacial bonding force, which ultimately determine the exposure height and displacement of diamond. To ensure a higher diamond exposure height and reduced particle displacement of the diamond conditioner applied in the semiconductor industry, the optimized brazing temperature is 880 °C and the heating rate is 5 °C/min. This study advances the understanding of wetting-driven morphological evolution of the brazing alloy during vacuum brazing, and provides a scientific basis for optimizing temperature and heating rate to manufacture high-performance ordered arrangement diamond tools.

有序排列的钎焊金刚石工具通过控制金刚石的分布和暴露高度，提高了加工效率。然而，在钎焊过程中，工艺参数的变化会影响钎焊合金与金刚石之间的润湿性，从而产生不同的钎焊形貌。本研究建立了基于计算流体力学（CFD）的钎焊仿真模型，研究了温度和升温速率对Cu-20Sn-10Ti合金暴露高度和金刚石位移的影响。模拟和实验结果均表明，随着温度的升高，金刚石的暴露高度逐渐降低，而由于过度润湿，颗粒间距的变化增大。随着升温速率的增加，暴露高度先增大后减小，而颗粒间距的变化则相反。钎焊合金经历了固态、固液共存状态和完全液态三个阶段。在完全液态阶段，合金与金刚石的润湿性行为显著影响毛细力和界面结合力，最终决定金刚石的暴露高度和位移。为了保证半导体行业应用的金刚石调理剂具有更高的金刚石暴露高度和减少颗粒位移，优化的钎焊温度为880℃，加热速率为5℃/min。本研究促进了对真空钎焊过程中钎焊合金润湿驱动的形态演变的认识，为优化温度和加热速率制造高性能有序排列金刚石工具提供了科学依据。

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引用次数: 0

Textural characterization of Northern Brazilian bauxites for geometallurgical modeling 巴西北部铝土矿的结构特征，用于地质冶金建模

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-12 DOI: 10.1016/j.jmrt.2025.12.012

Felipe Antonialli , Rafael dos Santos Macedo , Mauricio Guimarães Bergerman , Carina Ulsen

The texture of the bauxite from Porto Trombetas (Pará, Brazil) can be represented as halo (H), porcelanatic (P), grainy (G), and box-work (B) types. The influence of each texture on processing performance remains poorly understood. This work aims to evaluate whether the physicochemical properties and metallurgical behavior of bauxite are affected by bauxite texture type. Physical properties (density, porosity, moisture content, and grindability) were analyzed for 133 samples from two mines, representing the four textures. Chemical analysis was simultaneously conducted on 78 samples, to determine the major components, reactive silica, and available alumina. The samples were sub-grouped by porosity and texture. Phase-association, mineralogy and mechanical tests were examined through elemental mapping (μXRF and SEM-EDS), Rietveld refinements on X-ray diffractometry and Bond Index, respectively. The results demonstrated that porosity effectively indicates grindability and differentiates textures; whereas, drying rates are primarily controlled by reactive silica content. Deleterious minerals (mainly kaolinite) were not systematically enriched in the finer fraction (<0.037 mm). Elemental mapping provided insights into kaolinite-gibbsite interaction: in some textures, they are almost indistinguishable due to silica occlusion; whilst, in others, reactive silica is of limited significance. Texture B combines highly available alumina with low reactive silica textures. P and H exhibit pronounced weathering zones and intrinsic microporosity. G shows aluminum dilution due to the high quartz content. Microstructural analyses revealed distinct kaolinite-gibbsite associations and silica occlusion patterns. Integrating quantitative textural classification with metallurgical metrics can be a good way to perform a predictive and operationally relevant framework for optimizing beneficiation and enhancing resource utilization in tropical gibbsitic bauxites.

来自波尔图特朗贝塔斯（par，巴西）的铝土矿的纹理可以表示为晕状(H)，瓷状(P)，粒状(G)和盒状(B)类型。每种纹理对加工性能的影响仍然知之甚少。本工作旨在评价铝土矿的物理化学性质和冶金行为是否受到铝土矿结构类型的影响。分析了来自两个矿山的133个样品的物理性质（密度、孔隙率、含水率和可磨性），代表了四种纹理。同时对78个样品进行了化学分析，以确定主要成分，活性二氧化硅和有效氧化铝。根据孔隙度和质地对样品进行分组。通过元素映射（μXRF和SEM-EDS）、Rietveld细化（x射线衍射）和键合指数（Bond Index）分别进行了相关联、矿物学和力学测试。结果表明，孔隙度可以有效地指示可磨性并区分纹理；然而，干燥速率主要由活性二氧化硅含量控制。有害矿物（主要是高岭石）在较细粒（<0.037 mm）中没有系统富集。元素映射提供了高岭石-三沸石相互作用的见解：在一些纹理中，由于二氧化硅遮挡，它们几乎无法区分；然而，在其他情况下，活性二氧化硅的意义有限。质地B结合了高可用性氧化铝和低活性二氧化硅质地。P和H具有明显的风化带和固有的微孔隙。G表示铝因石英含量高而稀释。显微结构分析显示明显的高岭石-三水铝石组合和二氧化硅闭塞模式。将定量结构分类与冶金指标相结合，可为优化热带铝土矿选矿和提高资源利用率提供预测和操作相关的框架。

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引用次数: 0

Biodegradable Mg–Zn–Mn alloys for orbital bone fixation: Balancing corrosion resistance and mechanical integrity 用于眼眶骨固定的可生物降解Mg-Zn-Mn合金：平衡耐腐蚀性和机械完整性

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-12 DOI: 10.1016/j.jmrt.2025.12.039

Xiong Wu , Li Zhu , Xuerui Jing , Ziad Alzubair Osman Sirag , Eenci Niu , Hongfeng Yuan , Jia She

The clinical application of biodegradable magnesium alloys in orthopedic implants requires a balance between mechanical strength, corrosion resistance, and biocompatibility. This work investigates the effects of Mn addition (0, 0.5, and 1 wt%) on the microstructure, strength, degradation behavior, and biocompatibility of Mg–1Zn alloy for its possible application in orbital bone fixation. Mn addition resulted in significant grain refinement, linked to nucleation induced by coarse second phases and suppression of grain boundary migration by fine precipitates. This grain refinement contributed to a considerable increase in yield strength, from 146 MPa to 225 MPa, with increasing Mn content. Among the tested alloys, 0.5 wt% Mn showed the lowest corrosion rate (0.27 mm/y in vitro). All the tested alloys showed excellent cytocompatibility in vitro. Furthermore, in vivo implantation into rabbit zygomatic bones confirmed that Mg–1Zn-0.5Mn improved effective tissue integration and controlled degradation behavior. This alloy achieved a favorable balance between mechanical performance and biodegradability, with a stable in vivo corrosion rate of 0.34 mm/y during the three-month implantation period. These findings suggest that Mg–1Zn-0.5Mn is a promising material for orbital bone fixation.

生物可降解镁合金在骨科植入物中的临床应用需要在机械强度、耐腐蚀性和生物相容性之间取得平衡。本研究研究了Mn添加量（0、0.5和1wt %）对Mg-1Zn合金的微观结构、强度、降解行为和生物相容性的影响，以期其在眶骨固定中的应用。Mn的加入导致晶粒细化，这与粗第二相诱导成核和细相抑制晶界迁移有关。随着Mn含量的增加，晶粒细化使屈服强度从146 MPa提高到225 MPa。在测试合金中，0.5 wt% Mn的腐蚀速率最低（0.27 mm/y）。所有合金均表现出良好的体外细胞相容性。此外，在兔颧骨体内植入证实Mg-1Zn-0.5Mn改善了有效的组织整合并控制了降解行为。该合金在力学性能和生物降解性之间取得了良好的平衡，在3个月的植入期间，其体内腐蚀速率稳定在0.34 mm/y。这些发现表明Mg-1Zn-0.5Mn是一种很有前途的眶骨固定材料。

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引用次数: 0

Multiscale defect engineering for synergistic strength, electrical and thermal conductivity in aluminum alloys: A review 铝合金协同强度、导电性和导热性的多尺度缺陷工程研究进展

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.113

Wenjing Liu , Yuandong Li , Jin Qiu , Xiaomei Luo , Hongwei Zhou , Guangli Bi , Tijun Chen

Advanced aluminum alloys face an inherent trade-off between strength and electrical/thermal conductivities, creating a challenge for next-generation applications in electric vehicles (EVs) and aerospace. Moving beyond the traditional paradigm of defect elimination, this review presents a visionary roadmap for multiscale defect architectural design. This review synthesizes key strategies from the perspective of defect engineering, elucidating how zero-to three-dimensional defects fundamentally govern the competition between mechanical response and charge/heat transport. Crucially, this review establishes a framework for transitioning from passive defect control to active synergistic design, emphasizing strategies such as precipitate pinning, interface engineering, and gradient structures that strengthen the alloy while minimizing electron scattering. Finally, the review outlines a future trajectory driven by the convergence of multi-scale physics modeling, in-situ characterization, and machine learning. The objective is to establish a predictive capability that links atomic-scale defect configurations to macroscopic performance, providing a practicable pathway for determining the upper limits of synergistic strength-conductivity optimization.

先进铝合金面临着强度和导电性之间的内在权衡，这给下一代电动汽车和航空航天领域的应用带来了挑战。超越了传统的缺陷消除范例，这篇综述为多尺度缺陷架构设计提出了一个有远见的路线图。本文从缺陷工程的角度综合了关键策略，阐明了零到三维缺陷如何从根本上控制机械响应和电荷/热输运之间的竞争。重要的是，本文建立了一个从被动缺陷控制到主动协同设计的过渡框架，强调了诸如沉淀钉住、界面工程和梯度结构等策略，这些策略可以增强合金，同时最大限度地减少电子散射。最后，综述概述了由多尺度物理建模、原位表征和机器学习的融合驱动的未来轨迹。目标是建立一种将原子尺度缺陷构型与宏观性能联系起来的预测能力，为确定协同强度-电导率优化的上限提供切实可行的途径。

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引用次数: 0

Mechanical and tribological properties of a refractory high entropy HfMoNbTaTiVWZr thin film metallic glass implanted with nitrogen ions 氮离子注入难熔高熵HfMoNbTaTiVWZr薄膜金属玻璃的力学和摩擦学性能

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.114

Karolina Stępniak , Farid Akhtar , Kinga Jasiewicz , Neonila Levintant-Zayonts , Aleksandra Królicka , Dariusz M. Jarząbek

This study examines nitrogen ion implantation's effects on the microstructure, mechanical behavior, and tribological performance of an octonary high-entropy thin film metallic glass HfMoNbTaTiVWZr. Ion implantation led to binary nitride formation, elemental redistribution, and surface modifications while maintaining significant degree of amorphization, what indicates local atomic rearrangement rather than crystallization. Structural and chemical analyses using TEM, XRD, and EDS mapping revealed phase stability changes and preferential segregation of heavy elements like hafnium and tantalum at high doses. Hardness enhancement was attributed to solid solution strengthening, fine nitride formation, increased lattice distortion, residual stress, and densification. At an optimal implantation dose (1e17 ions/cm²), hardness increased to 20 GPa, reducing the coefficient of friction and improving wear resistance. A comparison with a magnetron-sputtered (HfMoNbTaTiVWZr)N thin film showed distinct hardness-depth profiles, confirming localized strengthening effects. These findings highlight nitrogen implantation as an effective surface engineering technique for optimizing material performance in demanding applications.

本文研究了氮离子注入对八元高熵薄膜金属玻璃HfMoNbTaTiVWZr的微观结构、力学行为和摩擦学性能的影响。离子注入导致二元氮化物形成、元素重分布和表面修饰，同时保持显著程度的非晶化，这表明局部原子重排而不是结晶。利用TEM、XRD和EDS图谱进行的结构和化学分析揭示了在高剂量下，铪和钽等重元素的相稳定性变化和优先偏析。硬度的提高是由于固溶体强化、细氮化物的形成、晶格畸变、残余应力和致密化的增加。在最佳注入剂量（1e17离子/cm2）下，硬度提高到20 GPa，降低了摩擦系数，提高了耐磨性。与磁控溅射（HfMoNbTaTiVWZr）N薄膜相比，显示出不同的硬度深度分布，证实了局部强化效果。这些发现突出了氮注入作为在苛刻应用中优化材料性能的有效表面工程技术。

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引用次数: 0

Characterization of residual stress in a SiC drilling hole using ns pulse laser machining by Raman spectroscopy 纳米脉冲激光加工SiC钻孔残余应力的拉曼光谱表征

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.098

Po-I Chen , Yu-Lung Lo , Jia-Yan Yang

This study integrates Raman spectroscopy and COMSOL simulations to investigate residual stress induced by nanosecond pulsed laser drilling in 4H-SiC wafers. The Heat Transfer in Solids module with an axis-symmetrical model was employed in the FEM analysis, combined with the formed geometry. Experimentally, a 1064 nm ytterbium fiber laser was used to drill through-holes with 50 pulses, achieving a depth of 350

μ m

. Raman mapping near the hole edge revealed a nearly symmetric stress distribution, with peak values of 30–45 MPa on either side. The simulation, conducted with 45 pulses, predicted a hole depth of 345 μm with a 1.43 % error and a maximum stress of 33 MPa, based on the biaxial stress model, showing good agreement with the experimental data. Despite discrepancies in peak stress magnitudes, the overall spatial trends were consistent. In addition, based on a six-stress field extracted from simulation, the predicted Raman shift is approximately −0.14 cm⁻¹, which is compared to the experimental data of −0.16 cm⁻¹, resulting in a relative error of 12.5 %. Additionally, experimental measurements showed that the heat-affected zone (HAZ) extended to approximately 600 μm when a 60 μm-diameter hole was drilled using a focused spot diameter of approximately 15 μm. The simulation results also predicted an HAZ width of roughly 600 μm, showing excellent agreement with the experimental observations. It is concluded that a simple heat-conduction model using an axisymmetric domain accurately predicts the residual stress and the HAZ around the hole, both of which match the experimental results. This agreement is further strengthened by validation using Raman-shift projections from the full stress field, which provides a direct and internally consistent basis for comparison.

本研究结合拉曼光谱和COMSOL模拟来研究纳秒脉冲激光在4H-SiC晶圆上打孔引起的残余应力。有限元分析采用轴对称模型的固体传热模块，并结合成形的几何形状。实验中，利用1064 nm的镱光纤激光器，以50个脉冲穿孔，穿孔深度达到350 μm。孔边拉曼图显示应力分布近似对称，两侧峰值均在30 ~ 45 MPa之间。基于双轴应力模型，利用45个脉冲进行模拟，预测出的孔深为345 μm，最大应力为33 MPa，误差为1.43%，与实验数据吻合较好。尽管峰值应力大小存在差异，但总体空间趋势是一致的。此外，基于模拟提取的六应力场，预测的拉曼位移约为- 0.14 cm−1，与实验数据的- 0.16 cm−1相比，相对误差为12.5%。实验结果表明，当聚焦光斑直径约为15 μm，孔径为60 μm时，热影响区（HAZ）扩大到约600 μm。模拟结果预测HAZ宽度约为600 μm，与实验结果吻合良好。结果表明，采用轴对称域的简单热传导模型准确地预测了孔周围的残余应力和热影响区，与实验结果吻合。通过使用全应力场的拉曼位移预测进行验证，进一步加强了这种一致性，这为比较提供了直接和内部一致的基础。

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引用次数: 0

Role of nickel in tensile response and fracture of as-cast Al–5Cu-1.2Fe alloys: Intermetallic evolution analyzed by X-ray computed microtomography 镍在铸态Al-5Cu-1.2Fe合金拉伸响应和断裂中的作用：用x射线计算机显微断层扫描分析金属间演变

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.110

Felipe Escher Saldanha , Jaderson Rodrigo da Silva Leal , Guilherme Lisboa de Gouveia , José Eduardo Spinelli

The presence of Fe-rich intermetallic compounds (IMCs) in recycled Al alloys often leads to coarse, brittle morphologies that degrade mechanical performance. Ni additions have been proposed to alter the formation and morphology of these phases, but their effects on tensile behavior and fracture mechanisms in Al–Cu–Fe alloys remain unclear, while three-dimensional (3D) characterization of IMCs is limited. This work investigates the influence of 1 wt% Ni on the solidification, microstructure, tensile properties, and fracture behavior of directionally solidified Al–5Cu–1.2Fe alloys. Al₁₃Fe₄ phase was identified in the ternary alloy, whereas Al₉FeNi formed in the Ni-containing alloy. At high cooling rates (∼13.0 ^oC/s), the ternary alloy exhibited higher tensile strength (>265 MPa) and elongation (>15 %) than the quaternary alloy (∼230 MPa, ∼9 %). Although Ni addition reduced the room-temperature properties compared with the ternary alloy, they remain high relative to conventional as-cast commercial Al–Cu based alloys, with the Al₉FeNi phase expected to provide benefits for thermal stability. Micro-CT revealed bulky, branched 3D Al₁₃Fe₄ networks in the ternary alloy, whereas Al₉FeNi particles in the quaternary alloy were partially refined but retained branched morphologies aligned with the solidification direction. Particle size distributions confirmed larger IMCs in the ternary alloy and more refined particles in the Ni-containing alloy at higher cooling rates, although coarse particles persisted at lower rates. Surface area-to-volume ratios were consistently higher in the ternary alloy, indicating more efficient stress transfer during loading compared to the quaternary alloy.

再生铝合金中富铁金属间化合物（IMCs）的存在通常会导致粗糙、脆性的形貌，从而降低机械性能。人们提出添加Ni可以改变这些相的形成和形态，但它们对Al-Cu-Fe合金的拉伸行为和断裂机制的影响尚不清楚，而IMCs的三维表征也很有限。本文研究了1wt % Ni对定向凝固Al-5Cu-1.2Fe合金凝固、显微组织、拉伸性能和断裂行为的影响。三元合金中存在Al13Fe4相，而含镍合金中存在Al9FeNi相。在高冷却速率（~ 13.0 oC/s）下，三元合金的抗拉强度（>265 MPa）和伸长率（> 15%）高于季系合金（~ 230 MPa, ~ 9%）。尽管与三元合金相比，Ni的加入降低了室温性能，但与传统铸态商用Al-Cu基合金相比，它们仍然很高，而Al9FeNi相有望提供热稳定性。显微ct显示，三元合金中Al13Fe4颗粒呈粗大的分支状三维网络，而第四系合金中的Al9FeNi颗粒部分细化，但仍保留了与凝固方向一致的分支状形貌。颗粒尺寸分布证实，在较高的冷却速率下，三元合金的imc较大，含镍合金的imc较细，尽管粗颗粒在较低的冷却速率下持续存在。三元合金的表面积体积比始终较高，这表明在加载过程中，与四元合金相比，应力传递更有效。

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引用次数: 0

Partitioning of Zn and its effect on the corrosion of Mg–9Li–1Zn alloy Zn的分配及其对Mg-9Li-1Zn合金腐蚀的影响

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

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.072

Yi-Ting Hsu, Yu-Ping Su, Ting-Hsuan Hsiao, Siao-Ying Chen, Te-Cheng Su, Chao-Sung Lin

Galvanic coupling between α-Mg and β-Li accelerates corrosion of dual-phase Mg–Li alloys, and the formation of Li carbonate has been reported to reduce corrosion. However, the influence of minor alloying elements, such as Zn and Al, on corrosion in dual-phase Mg–Li alloys is less well understood. The microstructure and corrosion behavior of commercial cold-rolled Mg–9Li–1Zn (LZ91) sheets were studied. The effect of Zn on corrosion was elucidated for the first time. The LZ91 sheet had a rolling texture composed of elongated, continuous β-Li and dispersed α-Mg phases, with Zn partitioned mainly in β-Li. Submicron MgLi₂Zn second phase resided at β-Li grain boundaries and β-Li/α-Mg interfaces, and fewer inside β-Li grains. During immersion in 0.05 M NaCl, corrosion prevailed in β-Li and was negligible in α-Mg. The MgLi₂Zn and β-Li micro-galvanic coupling resulted in the breakdown of the protective corrosion products. This study reveals, for the first time, how the presence of Zn in Mg–Li dual-phase alloys affects corrosion, highlighting that alloying elements and second phases are crucial to the corrosion susceptibility of dual-phase Mg–Li alloys.

α-Mg和β-Li之间的电偶联加速了双相Mg-Li合金的腐蚀，并且有报道称碳酸锂的形成减少了腐蚀。然而，少量合金元素，如Zn和Al，对双相Mg-Li合金腐蚀的影响尚不清楚。研究了商用冷轧Mg-9Li-1Zn （LZ91）薄板的显微组织和腐蚀行为。首次阐明了锌对腐蚀的影响。LZ91薄板具有由细长连续的β-Li相和分散的α-Mg相组成的滚动织构，其中Zn主要在β-Li相中分配。亚微米MgLi2Zn第二相主要分布在β-Li晶界和β-Li/α-Mg界面，较少分布在β-Li晶内。在0.05 M NaCl中浸泡时，β-Li腐蚀主要，α-Mg腐蚀可以忽略不计。MgLi2Zn与β-Li微电偶联导致防护腐蚀产物击穿。本研究首次揭示了锌在Mg-Li双相合金中的存在是如何影响腐蚀的，强调合金元素和第二相对Mg-Li双相合金的腐蚀敏感性至关重要。

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