Intermetallics最新文献_第3页

Effect of stacking fault energy on the dynamic deformation behavior of Fex(CoCrNi)100-x high-entropy alloys 层错能对Fex(CoCrNi)100-x高熵合金动态变形行为的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.intermet.2026.109181

Zecheng Wu , Ao Fu , Fusheng Tan , Jian Wang , Yuankui Cao , Zezhou Li , Jia Li , Qihong Fang , Bin Liu , Yong Liu

High-entropy alloys (HEAs) have great potential for applications under extreme loading conditions due to their excellent toughness and impact resistance. The stacking fault energy (SFE) of metallic materials essentially dominates the mechanical behavior of HEAs, but the atomic-scale mechanism of the effect of SFE on the high-speed deformation of the materials remains unclear. In this study, we systematically investigated the deformation mechanism of SFE on dynamic mechanical properties in Fe_x (CoCrNi)_100-x HEAs through a combination of experiments and molecular dynamics simulations. The results show that the intrinsic stacking fault energy (ISFE) decreases as the Fe content increases from 20% to 60%. The system with high SFE (Fe20) induces localized amorphization through the crossover of extrinsic stacking faults (ESFs), enabling it to achieve a high impact strength of 625 MPa while maintaining plasticity. However, due to frequent activation of the plane slip mechanism (including stacking faults (SFs), twinning, and reverse transformation), the impact strength of the system with low SFE is reduced to 468 MPa. The SFE-impact response correlation rule established in this study provides a theoretical basis for the design of HEAs under extreme dynamic loading scenarios.

高熵合金（HEAs）具有优异的韧性和抗冲击性，在极端载荷条件下具有很大的应用潜力。金属材料的层错能（stacking fault energy， SFE）本质上主导着HEAs的力学行为，但SFE对材料高速变形影响的原子尺度机制尚不清楚。在本研究中，我们通过实验和分子动力学模拟相结合的方法系统地研究了SFE对Fex (CoCrNi)100-x HEAs动态力学性能的变形机理。结果表明：当铁含量从20%增加到60%时，本征层错能（ISFE）减小；高SFE （Fe20）体系通过外源层错（ESFs）的交叉诱导局部非晶化，使其在保持塑性的同时获得625 MPa的高冲击强度。然而，由于频繁激活平面滑移机制（包括层错、孪晶和反向转变），低层错体系的冲击强度降低到468 MPa。本研究建立的sfe -冲击响应关联规则为极端动载工况下HEAs的设计提供了理论依据。

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引用次数: 0

High-temperature mechanical properties and wear resistance of nitrided 60NiTi alloy 氮化60NiTi合金的高温力学性能和耐磨性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-11 DOI: 10.1016/j.intermet.2026.109205

Huan Yang , Zheng Guo , Xinjian Cao , Weihong Gao , Xiao Liu , Haizhen Wang , Zhiyong Gao , Xianglong Meng , Xiaoyang Yi

60NiTi alloy has been becoming the most potential bearing and gear material due to its exceptional corrosion resistance, dimensional stability and high strength. However, the poor tribological properties at high-temperatures limit its widespread applications. In the present study, the TiN ceramic layer with a thickness of 1.18 μm was successfully introduced at the surface of 60NiTi alloy. Compared with homogenized 60NiTi alloy, the amount and dimension of Ni₃Ti phase were reduced and refined at the nitride layer. Meanwhile, the nano-scale Ni₄Ti₃ precipitates and long fibrous Ni₃Ti₂ phase can be observed within the matrix in the nitrided 60NiTi alloy. In contrast, the higher temperature compressive properties and superelasticity of nitrided 60NiTi alloy were superior to that of the homogenized 60NiTi alloy. The highest compressive fracture strength of 2471 MPa can be obtained in nitrided 60NiTi alloy at temperature of 50 °C, which was higher by 297 MPa than that of homogenized 60NiTi alloy. In proportion, the nitrided 60NiTi alloy exhibited the superior high-temperature wear resistance, accompanied with the smaller coefficient of friction (COF) and lower wear rate, which was attributed to the comprehensive effect of the higher microhardness of TiN ceramic phase layer, and the existence of residual stress as well as the superior superelasticity. Especially, the nitrided 60NiTi alloy possessed a wear rate of 6.3 × 10⁻³ mm³/N·m at the testing temperature of 300 °C, which was approximately 36% lower than that 9.8 × 10⁻³ mm³/N·m of the homogenized 60NiTi alloy. This breakthrough addressed the traditional limitation of insufficient high-temperature wear resistance in 60NiTi alloy and offered the direct experimental evidence for its application in critical components such as high-temperature bearings.

60NiTi合金已成为最有潜力的轴承和齿轮材料，由于其卓越的耐腐蚀性，尺寸稳定性和高强度。然而，其在高温下较差的摩擦学性能限制了其广泛应用。本研究成功地在60NiTi合金表面引入了厚度为1.18 μm的TiN陶瓷层。与均匀化的60NiTi合金相比，Ni3Ti相的数量和尺寸在氮化层得到了减少和细化。同时，在渗氮60NiTi合金的基体中，可以观察到纳米级Ni4Ti3析出相和长纤维状Ni3Ti2相。相比之下，氮化60NiTi合金的高温压缩性能和超弹性优于均匀化60NiTi合金。在温度为50℃时，氮化60NiTi合金的抗压断裂强度最高可达2471 MPa，比均匀化60NiTi合金的抗压断裂强度提高297 MPa。从比例上看，氮化60NiTi合金具有优异的高温耐磨性，摩擦系数（COF）较小，磨损率较低，这是TiN陶瓷相层显微硬度较高、残余应力的存在以及超弹性的综合作用。特别是，在300℃的测试温度下，氮化60NiTi合金的磨损率为6.3 × 10−3 mm3/N·m，比均匀化60NiTi合金的9.8 × 10−3 mm3/N·m降低了约36%。这一突破解决了60NiTi合金高温耐磨性不足的传统局限，为其在高温轴承等关键部件上的应用提供了直接的实验证据。

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引用次数: 0

High-temperature oxidation behavior of as-cast (Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8)100-xCux high-entropy alloys at 800 °C 铸态（Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8）100-xCux高熵合金在800℃的高温氧化行为

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-13 DOI: 10.1016/j.intermet.2026.109201

Zemin Wang , Yuerong Li , Hailong Wang , Wanting Sun , Yuanyuan Xu , Zhanyong Wang

In this study, the as-cast (Al_7.5Co_21.9Cr_10.9Ti_5.0Fe_21.9Ni_32.8)_100-xCu_x (x = 0.5, 2.5, 5.0, denoted as Cu 0.5, Cu 2.5 and Cu 5.0, respectively) high-entropy alloys (HEAs) with FCC and L1₂ dual phases were successfully fabricated, and the high-temperature oxidation behavior was systematically evaluated at 800 °C in air. It can be found that the dendritic structure in as-cast Cu-containing HEAs can provide preferential diffusion pathways for oxygen atoms, resulting in the formation of oxide layer with non-uniform thickness and different morphologies. The initial stage (<10 h) all HEAs exhibits transient linear kinetics due to surface reaction-controlled oxidation. After 10 h, the oxidation kinetics of all HEAs follows parabolic characteristic oxidation behavior, suggesting diffusion-controlled oxidation process at an elevated temperature. With the increase of Cu content, the oxidation resistance initially increases and then decreases. The lowest mass gain of 0.91 mg/cm² and the highest oxidation resistance can be obtained in the Cu 2.5 alloy. Besides, the Cu2.5 non-equiatomic HEA also exhibits superior oxidation resistance at 800 °C with a parabolic rate constant (k_p) of 6.3 × 10⁻⁹ g² cm⁻⁴ h⁻¹, which is significantly lower than those reported for equiatomic AlCoCrFeNi- and CoCrFeMnNi-based HEAs (typically 10⁻⁵-10⁻² g² cm⁻⁴ h⁻¹). This is attributed to the formation of compact and adherent Al₂O₃-Cr₂O₃ interfacial layer to effectively inhibit further oxidation. Notably, the dendritic and interdendritic regions exhibit distinct oxidation characteristics, indicating the microstructural heterogeneity and compositional partitioning can affect the oxidation resistance through hindering the diffusion of solute elements and the formation of protective oxide layer. It is anticipated that this work can provide deep insights into the design of compositionally optimized HEAs with the enhance oxidation resistance for high-temperature application.

本文成功制备了铸态（Al7.5Co21.9Cr10.9Ti5.0Fe21.9Ni32.8）100-xCux (x = 0.5, 2.5, 5.0，分别记为Cu 0.5, Cu 2.5和Cu 5.0) FCC和L12双相高熵合金（HEAs），并对其在800℃空气中的高温氧化行为进行了系统评价。结果表明，铸态含cu HEAs中的枝晶结构可以为氧原子提供优先的扩散路径，从而形成厚度不均匀、形貌各异的氧化层。初始阶段（10 h）由于表面反应控制氧化，所有HEAs都表现出瞬态线性动力学。10 h后，所有HEAs的氧化动力学都遵循抛物线特征氧化行为，表明在高温下存在扩散控制氧化过程。随着Cu含量的增加，其抗氧化性能先升高后降低。Cu 2.5合金的质量增益最低，为0.91 mg/cm2，抗氧化性最高。此外，Cu2.5非等原子HEA在800°C时也表现出优异的抗氧化性能，其抛物线速率常数（kp）为6.3 × 10−9 g2 cm−4 h−1，显著低于等原子AlCoCrFeNi-和cocrfemnni - HEAs（通常为10−10 ~ 10−2 g2 cm−4 h−1）。这是由于Al2O3-Cr2O3界面层形成致密和粘附，有效地抑制了进一步氧化。值得注意的是，枝晶和枝晶间区域表现出明显的氧化特征，表明微观组织的非均质性和成分分配可以通过阻碍溶质元素的扩散和氧化保护层的形成来影响抗氧化性。期望这项工作能够为设计具有增强高温应用抗氧化性的组合优化HEAs提供深入的见解。

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引用次数: 0

Compositional control of chemical short-range order and yield strength in NiCoCr medium-entropy alloys NiCoCr中熵合金化学短程序和屈服强度的成分控制

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-31 DOI: 10.1016/j.intermet.2026.109191

Lushan Li , Le Chang , Yuan Gu , Jianping Zhao , Jinling Zhao , Tao Dai

This study employs a hybrid Monte Carlo/Molecular Dynamics (MC/MD) method to systematically investigate the effects of varying atomic ratios (Ni/Co/Cr contents ranging from 20 to 60 at.%) on the formation of Short-Range Order (SRO) and the mechanical properties of the NiCoCr ternary system. The degree of SRO was quantified by calculating Warren-Cowley parameters, and the deformation behaviors of structures with SRO were compared against Random Solid Solution models under uniaxial tension. The results indicate that SRO structures significantly enhance the alloy's unstable stacking fault energy and yield strength. Microstructural analysis reveals that Ni-Ni clusters play a dual role in SRO structures: dislocations preferentially nucleate along the edges of Ni-Ni clusters, while these clusters simultaneously exert a pinning effect, hindering dislocation slip and propagation. Furthermore, the investigation into atomic ratio variations reveals that as Ni content increases, the system tends to form a continuous network of Ni-Ni clusters. Based on the simulation results, this study establishes a theoretical prediction model incorporating lattice friction, elastic misfit strengthening, and chemical bond-breaking strengthening. This model successfully captures the variation laws of yield strength with respect to atomic ratio and SRO degree. This work not only reveals the physical origins of SRO strengthening but also provides a theoretical basis for the compositional design of high-performance medium-entropy alloys.

本研究采用混合蒙特卡罗/分子动力学（MC/MD）方法系统地研究了不同原子比（Ni/Co/Cr含量在20 ~ 60 at之间）的影响。%)对NiCoCr三元体系的SRO形成及力学性能的影响。通过计算Warren-Cowley参数来量化SRO程度，并将SRO结构与随机固溶体模型在单轴拉伸下的变形行为进行比较。结果表明，SRO结构显著提高了合金的不稳定层错能和屈服强度。微观结构分析表明，Ni-Ni团簇在SRO结构中具有双重作用：位错优先沿Ni-Ni团簇边缘成核，而这些团簇同时发挥钉住作用，阻碍位错滑移和扩展。此外，对原子比变化的研究表明，随着Ni含量的增加，体系倾向于形成连续的Ni-Ni簇网络。基于仿真结果，建立了结合晶格摩擦、弹性失配强化和化学断键强化的理论预测模型。该模型成功地捕获了屈服强度随原子比和SRO度的变化规律。这项工作不仅揭示了SRO强化的物理根源，而且为高性能中熵合金的成分设计提供了理论依据。

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引用次数: 0

CALPHAD-guided design of corrosion-resistant cobalt-based high-entropy alloys with strength-ductility synergy achieved through V, Nb, and Ta alloying 基于calphad的抗腐蚀钴基高熵合金设计，通过V、Nb和Ta合金实现强度-延性协同

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-24 DOI: 10.1016/j.intermet.2026.109158

Wei Wang , Zhou Li , Mingzhen Han , Yi Zhang , Wangzhong Mu , Nan Wang , Wenda Zhang , Zhankun Weng

This study investigates the effects of vanadium (V), niobium (Nb), and tantalum (Ta) doping on the microstructure, electrochemical corrosion behavior, and mechanical properties of cobalt-based high-entropy alloys (HEAs). Guided by CALPHAD (CALculation of PHAse Diagrams) thermodynamic calculations, a series of alloys were designed and synthesized via vacuum induction melting, followed by homogenization and cryogenic treatments. Microstructural analyses revealed that V promotes the formation of σ phase, while Nb and Ta facilitate the precipitation of Laves phases within the face-centered cubic (fcc) matrix. Cryogenic treatment further refined the microstructure and promoted the formation of a hexagonal close-packed (hcp) martensite phase. Electrochemical tests in 3.5 wt% NaCl solution demonstrated that all doped alloys exhibit excellent passivation behavior, with the Nb-doped variant showing the highest corrosion resistance due to its enhanced charge transfer resistance and more stable passive film enriched with Cr₂O₃, CoCr₂O₄, CoFe₂O₄, and V/Nb/Ta oxides. Electrochemical corrosion tests and Pourbaix diagram analysis clarified the alloys' resistance to localized corrosion. Mechanical characterization indicated that precipitation hardening and deformation-induced martensitic transformation (TRIP effect) contribute to an outstanding strength-ductility balance. These results highlight the potential of V-, Nb-, and Ta-doped cobalt-based HEAs as advanced metallic materials for demanding applications in extreme environments.

研究了钒(V)、铌（Nb）和钽（Ta）掺杂对钴基高熵合金（HEAs）显微组织、电化学腐蚀行为和力学性能的影响。在CALPHAD（计算相图）热力学计算的指导下，通过真空感应熔炼、均匀化和低温处理，设计并合成了一系列合金。显微组织分析表明，V促进了σ相的形成，而Nb和Ta促进了面心立方（fcc）基体内Laves相的析出。低温处理进一步细化了显微组织，促进了六方密排马氏体相的形成。在3.5 wt% NaCl溶液中的电化学测试表明，所有掺杂合金都表现出优异的钝化行为，其中Nb掺杂合金由于其增强的电荷转移电阻和更稳定的钝化膜，富含Cr2O3， CoCr2O4， CoFe2O4和V/Nb/Ta氧化物，表现出最高的耐腐蚀性。电化学腐蚀试验和Pourbaix图分析表明合金具有抗局部腐蚀的能力。力学表征表明，沉淀硬化和变形诱发马氏体相变（TRIP效应）导致了优异的强度-塑性平衡。这些结果突出了V， Nb和ta掺杂钴基HEAs作为极端环境中苛刻应用的先进金属材料的潜力。

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引用次数: 0

High-throughput nanoindentation study on annealing-induced microstructural evolution and local creep behavior of NiAlCrFeMo high-entropy alloy NiAlCrFeMo高熵合金退火组织演变及局部蠕变行为的高通量纳米压痕研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-05 DOI: 10.1016/j.intermet.2026.109196

Yue Sun , Yuanming Huo , Zhijun Wang , Zhiwei Li , Zhaozhao Wang , Xiaoguang Yue , Seyed Reza Elmi Hosseini , Anqi Jiang , Xinyu Wang

High-entropy alloys (HEAs) exhibit excellent mechanical properties at room temperature, yet their microscale creep behavior and the associated thermo-mechanical stability mechanisms remain insufficiently understood. This study employs high-throughput nanoindentation to systematically investigate the influence of high-temperature annealing on the microstructural evolution and localized creep behavior of a NiAlCrFeMo HEA. After annealing at 700 °C, the precipitation of a cross-lamellar L1₂’ phase and α-Cr particles within the interdendritic B2 phase, coupled with the contraction of the L1₂-envelope, collectively enhances hardness and creep resistance in this region. At higher annealing temperatures of 1000 °C and 1200 °C, coarsening of the L1₂ phase and dissolution of precipitates within the B2 phase occur, which markedly weaken the pinning effect on dislocations and consequently reduce the creep resistance. Nanoindentation creep tests reveal that both phases and phase boundaries undergo predominantly transient and steady-state creep stages. Kinetic analysis based on stress exponents and activation volumes indicates that the creep mechanism is primarily governed by dislocation motion. This study reveals the micromechanism by which annealing-induced precipitation phase evolution modulates dislocation activity to influence the local creep behavior of multi-phase HEAs. This research provides a theoretical basis and process guidance for designing high-performance creep-resistant HEAs.

高熵合金（HEAs）在室温下表现出优异的力学性能，但其微尺度蠕变行为及其相关的热-机械稳定性机制尚不清楚。本研究采用高通量纳米压痕技术系统地研究了高温退火对NiAlCrFeMo HEA微观组织演变和局部蠕变行为的影响。700℃退火后，枝晶间B2相中析出了跨层L12′相和α-Cr颗粒，加上L12包层的收缩，共同提高了该区域的硬度和抗蠕变性能。在1000℃和1200℃的较高退火温度下，L12相发生粗化，B2相内析出相发生溶解，这明显减弱了位错的钉住作用，从而降低了抗蠕变性能。纳米压痕蠕变试验表明，相和相边界主要经历瞬态和稳态蠕变阶段。基于应力指数和激活体积的动力学分析表明，蠕变机制主要受位错运动控制。本研究揭示了退火诱导析出相演化调节位错活动影响多相HEAs局部蠕变行为的微观机制。该研究为高性能抗蠕变HEAs的设计提供了理论依据和工艺指导。

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引用次数: 0

Development of a high-entropy alloy with both high corrosion resistance and hardness by data-driven intelligent design methods 采用数据驱动的智能设计方法研制高耐蚀、高硬度的高熵合金

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-01-28 DOI: 10.1016/j.intermet.2026.109176

Qinying Wang , Yiping Wu , Yuhui Song , Daichen Li , Yuchen Xi , Yangfei Zhang , Shulin Bai

Harsh tribocorrosion conditions require enhanced corrosion resistance and hardness of metallic components. Data-driven approaches and the vast compositional space of high-entropy alloys (HEAs) offer the potential to efficiently discover novel HEAs combining high corrosion resistance, high hardness, and economic viability. This study developed multiple machine learning (ML) models to predict the corrosion resistance (pitting potential, E_p) of HEAs, among which the XGBoost model demonstrated optimal performance (R² = 0.86). Interpretation techniques including SHapley Additive exPlanation (SHAP), Individual Conditional Expectation (ICE), Accumulated Local Effect (ALE), and Partial Dependence Plots (PDP) elucidated the effects of compositional features on E_p and guided the selection of corrosion-resistant elements. Guided by hardness-oriented large lattice distortion and economic feasibility, the principal elements were identified for the target HEA. Inverse design via a genetic algorithm yielded the target composition of Fe_19.5Ni_20.5Cr_31.5Mn_7.5Ti₂₁ (wt.%), with experimental verification confirming excellent corrosion resistance and high hardness, achieving E_p = 0.872 V_SCE in a 3.5 wt% NaCl solution and a hardness of 815.9 HV. The alloy exhibits HCP and BCC phases. The corrosion resistance is attributed to the passivation effect of Cr, while the high hardness results from the significant lattice distortion induced by Ti addition.

苛刻的摩擦腐蚀条件要求提高金属部件的耐腐蚀性和硬度。数据驱动的方法和高熵合金（HEAs）的巨大成分空间为有效发现具有高耐腐蚀性、高硬度和经济可行性的新型HEAs提供了潜力。本研究建立了多个机器学习（ML）模型来预测HEAs的耐蚀性（点蚀电位，Ep），其中XGBoost模型表现最佳（R2 = 0.86）。包括SHapley加性解释（SHAP）、个体条件期望（ICE）、累积局部效应（ALE）和部分依赖图（PDP）在内的解释技术阐明了成分特征对Ep的影响，并指导了耐腐蚀元素的选择。以硬度取向的大晶格畸变和经济可行性为指导，确定了目标HEA的主要元素。通过遗传算法反设计得到的目标成分为Fe19.5Ni20.5Cr31.5Mn7.5Ti21 (wt.%)，经实验验证具有优异的耐蚀性和高硬度，在3.5 wt% NaCl溶液中Ep = 0.872 VSCE，硬度为815.9 HV。合金表现为HCP相和BCC相。由于Cr的钝化作用，合金具有良好的耐腐蚀性能；而由于Ti的加入，合金具有明显的晶格畸变，从而具有较高的硬度。

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引用次数: 0

First-principles and experimental investigations on intermetallic compounds in resistance element welded aluminum/steel joints 电阻元件焊接铝/钢接头金属间化合物的第一性原理及实验研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-03 DOI: 10.1016/j.intermet.2026.109189

Yue Yang , Zhen Luo , Lixing Zheng , Xiaojun Xue , Hailiang Liu , Hanwen Zhang

To examine the stability, mechanical properties, and electronic structures of intermetallic compounds (IMCs) in steel-aluminum resistance element welding (REW) joints, a study was conducted using first-principles calculations. The findings from these calculations revealed that the mechanical stability of steel-aluminum IMCs met the criteria based on their associated elastic constants. Although Fe₃Al and FeAl₂ exhibited ductile behavior, FeAl, Fe₂Al₅, and Fe₄Al₁₃ were found to possess brittle characteristics. Furthermore, the Fe-rich phases were discovered to have a more beneficial impact on the mechanical attributes of the joints than the Al-rich phases. The morphology, microstructure, composition, fracture morphology, and mechanical properties of the REWed joints were examined using various scientific techniques, including optical microscopy, scanning electron microscopy (SEM), electron backscatter diffraction (EBSD), energy-dispersive spectroscopy (EDS), and nanoindentation. Fe₂Al₅ and Fe₄Al₁₃ were formed at the welding interface, indicating that the experimental observations aligned well with the theoretical predictions. Using nanoindentation, the hardness of Fe₂Al₅ and Fe₄Al₁₃ were measured to be 13.65 and 12.65 GPa, respectively. By combining experimental methods and first-principles calculations, it was demonstrated that the mechanical properties of Fe₂Al₅ were superior to those of Fe₄Al₁₃.

为了研究钢-铝电阻元件焊接（REW）接头中金属间化合物（IMCs）的稳定性、力学性能和电子结构，采用第一性原理计算方法进行了研究。计算结果表明，基于相关弹性常数，钢-铝复合材料的力学稳定性符合标准。Fe3Al和FeAl2具有延展性，而FeAl、Fe2Al5和Fe4Al13具有脆性。此外，富铁相比富铝相对接头的力学属性有更有利的影响。采用各种科学技术，包括光学显微镜、扫描电镜（SEM）、电子背散射衍射（EBSD）、能量色散光谱（EDS）和纳米压痕，对REWed接头的形貌、微观结构、成分、断裂形貌和力学性能进行了检测。在焊接界面处形成Fe2Al5和Fe4Al13，表明实验结果与理论预测吻合较好。采用纳米压痕法测定了Fe2Al5和Fe4Al13的硬度分别为13.65和12.65 GPa。结合实验方法和第一性原理计算，证明了Fe2Al5的力学性能优于Fe4Al13。

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引用次数: 0

Heat treatment-induced microstructure regulation of Fe-Si-B amorphous alloys: Enhanced electrocatalytic degradation of methylene blue and its mechanism Fe-Si-B非晶合金热处理诱导的微观结构调控：增强亚甲基蓝电催化降解及其机理

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-02 DOI: 10.1016/j.intermet.2026.109190

Long-peng Yang , Chun-yan Li , Hai-qun Wang , Xuan-le Zhi , Xin-hua Wang , Zheng Wang , Kai-xiong Gao , Xiao-cheng Li , Sheng-zhong Kou

To develop high-efficiency catalysts for dye-containing wastewater treatment, this study systematically investigated the effect of heat treatment on the electrocatalytic degradation performance of high-activity Fe-Si-B amorphous alloy ribbons with large specific surface area for methylene blue (MB) and its underlying mechanism. The study focused on exploring the regulatory laws of heat treatment temperature and holding time on the material structure, surface morphology, and degradation performance. Results show that heat treatment temperature and time exert significant regulatory effects on degradation performance: the performance at 898 K is 18.13 % higher than that of the untreated sample, and extending the holding time can improve the performance by up to 51.81 %. After heat treatment, the electrode energy consumption and loss are reduced by 27.35 % and 17.42 %, respectively, and the material exhibits excellent electrochemical stability. The performance enhancement is attributed to the heat treatment-induced precipitation of α-Fe, Fe₃Si, and Fe₂B crystalline phases, which form a galvanic cell effect with the original amorphous matrix, reduce the electron work function, and promote electron transfer. Meanwhile, the surface morphology evolves from corrosion pits to three-dimensional (3D) nano-spike and porous structures, increasing the number of active sites. Under the synergistic effect of an applied electric field, the reaction kinetics are significantly enhanced, enabling efficient degradation of MB. This study provides a theoretical basis for the design of high-activity amorphous alloy catalysts.

为了开发高效的含染料废水处理催化剂，本研究系统地研究了热处理对高活性大比表面积Fe-Si-B非晶合金带对亚甲基蓝（MB）电催化降解性能的影响及其机理。重点探讨热处理温度和保温时间对材料结构、表面形貌和降解性能的调节规律。结果表明，热处理温度和时间对降解性能有显著的调节作用，898 K时的降解性能比未处理样品提高18.13%，延长保温时间可使降解性能提高51.81%。经热处理后，电极能耗和损耗分别降低27.35%和17.42%，材料表现出优异的电化学稳定性。性能增强的原因是热处理诱导α-Fe、Fe3Si和Fe2B晶相析出，与原始非晶基体形成原电池效应，降低了电子功函数，促进了电子转移。同时，表面形貌由腐蚀坑演变为三维纳米尖刺和多孔结构，活性位点数量增加。在外加电场的协同作用下，反应动力学显著增强，实现了对MB的高效降解。本研究为设计高活性非晶合金催化剂提供了理论依据。

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引用次数: 0

Effect of silicon content and intermetallics on the microstructure, wear, and corrosion resistance of nonequimolar Ti2ZrHf0.5VNb0.5Six high-entropy alloys 硅含量和金属间化合物对非等摩尔ti2zrhf0.5 vnb0.56高熵合金组织、磨损和耐蚀性的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-04-01 Epub Date: 2026-02-14 DOI: 10.1016/j.intermet.2026.109211

Ruisong Gao , Xinmei Li , Peihao Zhang

This study examines lightweight refractory high-entropy alloys (LRHEAs) made from arc-melted Ti₂ZrHf_0.5VNb_0.5Si_x (x = 0, 0.1, 0.3, 0.5, and 0.7), focusing on how the Si content affects the microstructure, corrosion resistance, and wear resistance of the alloy. With increasing Si content, the alloy transforms from a single-phase body-centered cubic (BCC) structure to BCC + M₃Si_2, and then to BCC + M₃Si₂ + M₅Si₃. Significant grain refinement occurs, with the grain size decreasing from 572.2 μm for Si₀ to 100.8 μm for Si_0.5. Furthermore, the wear resistance is significantly enhanced, with Si_0.5 exhibiting the lowest wear rate of just 5.50 × 10⁻⁵ mm³/Nm. This improvement is mainly attributed to solid-solution strengthening, grain-boundary strengthening, and intermetallic precipitation strengthening. The friction coefficient also increases with increasing Si content, which is closely related to the formation of new silicide phases. Electrochemical tests reveal that the corrosion resistance first improves and then worsens as the Si content increases, with Si_0.5 offering the best overall performance. Thus, this study introduces a novel nonequimolar LRHEA, extending alloy design beyond equimolar compositions and overcoming the limitations of traditional high-entropy alloys. The additional design space conferred by nonequimolar LRHEAs provides new opportunities for the development and optimization of advanced materials. This study also offers effective guidance for adding Si to nonequimolar LRHEAs. The Ti₂ZrHf_0.5VNb_0.5Si_0.5 alloy has excellent wear and corrosion resistance, which are key properties for LRHEAs. Furthermore, its low density and excellent performance demonstrate its potential for use in the aerospace industry.

本研究考察了由弧焊Ti2ZrHf0.5VNb0.5Six （x = 0、0.1、0.3、0.5和0.7）制成的轻质耐火高熵合金（LRHEAs），重点研究了Si含量对合金的显微组织、耐腐蚀性和耐磨性的影响。随着Si含量的增加，合金由单相体心立方（BCC）组织转变为BCC + M3Si2，再转变为BCC + M3Si2 + M5Si3。晶粒细化明显，晶粒尺寸从Si0的572.2 μm减小到Si0.5的100.8 μm。此外，Si0.5的耐磨性显著增强，磨损率最低，仅为5.50 × 10−5 mm3/Nm。这种改善主要归功于固溶强化、晶界强化和金属间析出强化。摩擦系数随硅含量的增加而增大，这与新硅化物相的形成密切相关。电化学测试结果表明，随着Si含量的增加，材料的耐蚀性能先提高后降低，其中Si0.5的整体性能最好。因此，本研究引入了一种新的非等摩尔LRHEA，将合金设计扩展到等摩尔成分之外，并克服了传统高熵合金的局限性。非等摩尔LRHEAs所带来的额外设计空间为先进材料的开发和优化提供了新的机会。该研究也为非等摩尔LRHEAs中添加Si提供了有效的指导。Ti2ZrHf0.5VNb0.5Si0.5合金具有优异的耐磨损和耐腐蚀性能，这是LRHEAs的关键性能。此外，它的低密度和优异的性能表明了它在航空航天工业中的应用潜力。

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