Intermetallics最新文献_第10页

Strengthening mechanisms and corrosion resistance of Al15Cr15Fe50Ni20-xBx (x = 2, 4, and 6) low-density high-entropy alloys Al15Cr15Fe50Ni20-xBx （x = 2、4和6）低密度高熵合金的强化机理和耐蚀性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-31 DOI: 10.1016/j.intermet.2025.109051

Bo Li , Yu Yang , Wanqing Chen , Han Yang , Xicong Ye , Dong Fang

Interstitial atom doping has been demonstrated to effectively enhance the mechanical properties of high-entropy alloys (HEAs); however, its influence on corrosion resistance and the associated mechanisms remains insufficiently elucidated. In the present work, a series of B-doped low-density HEAs, Al₁₅Cr₁₅Fe₅₀Ni_20-xB_x (x = 2, 4, and 6), were synthesized via vacuum arc melting. The phase constituents and microstructural features were systematically characterized, and the structure–property relationships related to mechanical strengthening and corrosion behavior were investigated. The alloys comprise FCC, BCC, and boride phases. Specifically, Al₁₅Cr₁₅Fe₅₀Ni₁₈B₂ and Al₁₅Cr₁₅Fe₅₀Ni₁₆B₄ exhibit hypoeutectic microstructures, while Al₁₅Cr₁₅Fe₅₀Ni₁₄B₆ exhibits a hypereutectic structure. With increasing B content, the alloy density decreases from 6.80 g/cm³ to 6.42 g/cm³, classifying these alloys as low-density HEAs (ρ < 7.00 g/cm³). Strengthening analysis suggests that precipitation hardening (563.96 MPa) and grain refinement (372.18 MPa) are the dominant mechanisms, whereas solid solution strengthening (69.87 MPa) provides a supplementary contribution. Corrosion resistance evaluation reveals that the thickness of the surface passive film decreases progressively with B addition, which is closely associated with reduced Cr content in the matrix and increased elemental metal deposition. Localized galvanic coupling accelerates the preferential dissolution of the Ni- and Al-enriched BCC phase. Among the alloys investigated, Al₁₅Cr₁₅Fe₅₀Ni₁₈B₂ demonstrates the most favorable corrosion resistance, exhibiting a corrosion potential (E_corr = −187.86 mV) and corrosion current density (I_corr = 0.0164 μA/cm²), superior to those of 316L stainless steel and most conventional alloys.

研究表明，间隙原子掺杂能有效提高高熵合金的力学性能；然而，其对耐蚀性的影响及其相关机制尚未得到充分阐明。本文采用真空电弧熔炼法制备了一系列掺杂b的低密度HEAs Al15Cr15Fe50Ni20-xBx （x = 2、4和6）。系统表征了相组成和微观组织特征，研究了与力学强化和腐蚀行为相关的组织-性能关系。合金包括FCC相、BCC相和硼化物相。Al15Cr15Fe50Ni18B2和Al15Cr15Fe50Ni16B4表现为亚共晶组织，而Al15Cr15Fe50Ni14B6表现为过共晶组织。随着B含量的增加，合金密度从6.80 g/cm3降至6.42 g/cm3，属于低密度HEAs （ρ < 7.00 g/cm3）。强化分析表明，沉淀硬化（563.96 MPa）和晶粒细化（372.18 MPa）是主要的强化机制，固溶强化（69.87 MPa）起辅助作用。耐蚀性评价表明，随着B的加入，表面钝化膜的厚度逐渐减小，这与基体中Cr含量的降低和金属元素沉积的增加密切相关。局部电偶联加速了富集Ni和al的BCC相的优先溶解。其中，Al15Cr15Fe50Ni18B2的腐蚀电位（Ecorr =−187.86 mV）和腐蚀电流密度（Icorr = 0.0164 μA/cm2）均优于316L不锈钢和大多数常规合金。

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引用次数: 0

Coupling relationship between microstructure and high-temperature oxidation mechanism in alloying element-guided eutectic high-entropy alloys 元素导向共晶高熵合金显微组织与高温氧化机理的耦合关系

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-30 DOI: 10.1016/j.intermet.2025.109055

Shan Wang , Yan Cui , Yangchuan Cai , Xiaohua Wang , Jinyao Mu , Yan Zhao

This study investigates the high-temperature oxidation behavior of three high-entropy alloys (HEAs) with distinct eutectic microstructures: hypoeutectic FeCoNi_2.0Cr_1.2Mo_0.2Nb_0.5 (Nb_0.5), eutectic FeCoNi_2.0Cr_1.2Mo_0.2Nb_0.63 (Nb_0.63), and hypereutectic FeCoNi_2.0Cr_1.2Mo_0.2Nb_0.9 (Nb_0.9). All three HEAs exhibit a dual-phase microstructure comprising FCC and HCP phases. The oxidation behavior was evaluated after 100 h of isothermal exposure at 600 °C and 800 °C. The results demonstrate that the oxidation kinetics of all alloys follow a parabolic rate law, indicating diffusion-controlled mechanisms. Characterization via XRD, XPS, and SEM revealed that the oxide scale is predominantly Cr₂O₃, which preferentially nucleates at grain boundaries and subsequently covers the entire surface. Among these, the Nb_0.63 EHEA exhibited the highest oxidation resistance, rapidly forming a continuous and dense Cr₂O₃ scale in the initial oxidation stage, which effectively impeded the outward diffusion of metal ions and the inward diffusion of oxygen. During oxidation at 800 °C, acicular Nb-rich precipitates formed within the FCC phase of all three alloys. These precipitates act as more effective barriers against oxygen ion diffusion than the parent phase, further enhancing the oxidation resistance. This work elucidates the synergistic mechanism between the eutectic microstructure and precipitation behavior on the oxidation resistance of HEAs, providing a theoretical and experimental basis for designing novel high-entropy alloys with superior high-temperature oxidation resistance.

本文研究了三种不同共晶组织的高熵合金（HEAs）的高温氧化行为：亚共晶FeCoNi2.0Cr1.2Mo0.2Nb0.5 （Nb0.5）、共晶FeCoNi2.0Cr1.2Mo0.2Nb0.63 （Nb0.63）和过共晶FeCoNi2.0Cr1.2Mo0.2Nb0.9 （Nb0.9）。三种HEAs均表现为FCC相和HCP相的双相结构。在600°C和800°C等温暴露100 h后评估氧化行为。结果表明，所有合金的氧化动力学都遵循抛物线速率规律，表明了扩散控制机制。XRD、XPS和SEM表征表明，氧化垢主要为Cr2O3，在晶界处优先成核，随后覆盖整个表面。其中，Nb0.63 EHEA的抗氧化性最高，在氧化初期迅速形成连续致密的Cr2O3垢，有效地阻碍了金属离子向外扩散和氧向内扩散。在800℃氧化过程中，三种合金的FCC相均形成针状富铌析出物。这些沉淀比母相更有效地阻止氧离子扩散，进一步增强了抗氧化性。本研究阐明了共晶组织和析出行为对HEAs抗氧化性能的协同作用机制，为设计新型高熵高温抗氧化合金提供了理论和实验依据。

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引用次数: 0

Transient liquid phase sintering with nanophase reinforcement enables silver joints with low thermal resistance and high shear strength 纳米相增强的瞬态液相烧结使银接头具有低热阻和高抗剪强度

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-29 DOI: 10.1016/j.intermet.2025.109059

Yiming Xu , Jiaying Zhang , Xuanjue Hu , Yiding Yu , Wenhao Gao , Jinhua Qin , Yunzhu Ma , Wensheng Liu , Siwei Tang , Zhongkun Lin , He Wang

High-power semiconductor devices demand reliable interconnects that can be processed at low temperatures and pressures without sacrificing performance. To address this need, a composite solder paste consisting of InSn alloy and silver powder was used to join copper substrates at 200 °C under 5 MPa. The incorporation of InSn significantly improved sintering densification, reducing porosity to 1.96 % at an optimal content of 20 wt%. At this condition, uniformly dispersed Ag₃(In,Sn) nanoparticles (∼205 nm) within the joint provided dispersion strengthening, while a dense, continuous Cu₆(In,Sn)₅ intermetallic compound (IMC) layer at the interface contributed to strong metallurgical bonding. This dual reinforcement mechanism elevated the joint's shear strength to 25.8 MPa. Although the alloy addition slightly increased the intrinsic thermal resistance, the sharp drop in porosity at 20 wt% led to a low effective thermal resistance of 2.39 mm² K/W. This study presents a viable pathway for engineering high-performance, low-temperature sintering pastes tailored for advanced power electronics packaging.

高功率半导体设备需要可靠的互连，可以在低温和低压下处理，而不会牺牲性能。为了满足这一需求，使用由InSn合金和银粉组成的复合锡膏在200°C和5 MPa下连接铜衬底。InSn的掺入显著改善了烧结致密性，在最佳含量为20% wt%时，孔隙率降至1.96%。在此条件下，界面内均匀分散的Ag3（In,Sn）纳米颗粒（~ 205 nm）提供了弥散强化，而界面处致密连续的Cu6(In,Sn)5金属间化合物（IMC）层有助于增强冶金结合。双配筋机制使节理抗剪强度达到25.8 MPa。虽然合金的加入略微增加了固有热阻，但孔隙率在20 wt%时急剧下降导致有效热阻较低，为2.39 mm2 K/W。这项研究为高性能低温烧结浆料的工程设计提供了一条可行的途径，该浆料可用于先进的电力电子封装。

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引用次数: 0

L12 nano-precipitates-driven microstructural design for enhanced oxidation resistance of CoCrNi-based medium-entropy alloys 增强cocrni基中熵合金抗氧化性能的L12纳米析出物驱动显微组织设计

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-27 DOI: 10.1016/j.intermet.2025.109049

Zhiyi Ding , Junjie Liu , Xiaohong Chen , Aiying Chen , Tong Wang , Bin Gan , Jinchao Song

Driven by advancements in aerospace and gas turbine technologies, CoCrNi-based medium-entropy alloys (MEAs) have emerged as promising high-temperature structural materials due to their exceptional thermomechanical properties. Although the incorporation of γ′-forming elements (Al, Ti) enhances strength via nanoscale precipitate strengthening, it often compromises the alloy's inherent oxidation resistance. To resolve this, the present study systematically optimized the base-element composition of a Co-Cr-Ni-based MEA, with isothermal oxidation behavior investigated at 800 °C for 600 h in air. The results demonstrate that a Ni-rich composition exhibits superior oxidation resistance and structural stability, attributed to its high-density γ/γ′ dual-phase structure which promotes the formation of a stable protective scale mainly composed of Al₂O₃ and Cr₂O₃, minimizes internal oxidation, and effectively suppresses spallation. In contrast, CoCrNi-based and Co-rich alloy suffer from severe spallation due to grain boundary widening. This work establishes a foundational strategy for enhancing the environmental durability and mechanical performance of CoCrNi-based MEAs, facilitating their application in next-generation high-temperature systems.

在航空航天和燃气轮机技术进步的推动下，cocrni基中熵合金（MEAs）因其优异的热机械性能而成为有前途的高温结构材料。虽然γ′形成元素（Al, Ti）的加入通过纳米级析出强化提高了强度，但它往往会损害合金固有的抗氧化性。为了解决这个问题，本研究系统地优化了co - cr - ni基MEA的基本元素组成，并在空气中800°C、600 h的等温氧化行为进行了研究。结果表明，富ni成分具有较高的抗氧化性和结构稳定性，其高密度的γ/γ′双相结构促进了主要由Al2O3和Cr2O3组成的稳定保护层的形成，减少了内部氧化，有效地抑制了剥落。而cocrni基和富co合金由于晶界变宽而出现严重的剥落。这项工作为提高基于cocrni的mea的环境耐久性和机械性能建立了基础策略，促进了它们在下一代高温系统中的应用。

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引用次数: 0

Revealing the role of low-temperature delayed sintering technique in double-layer grain-boundary diffusion sintered Nd-Ce-Fe-B magnets 揭示低温延迟烧结技术在双层晶界扩散烧结Nd-Ce-Fe-B磁体中的作用

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-27 DOI: 10.1016/j.intermet.2025.109050

Chen Jiang , Jiajie Li , Zhixi Deng , Yue Huang , Qianjun Weng , Bowen Yang , Zheng Xiao , Munan Yang

To further improve the diffusion efficiency and reduce the cost of preparing high-performance Nd-Fe-B magnets, grain boundary diffusion of double-layer coated Nd-Ce-Fe-B sintered magnets was carried out by low temperature delayed (LTD) sintering. The results demonstrate that LTD-diffused magnets maintain a coercivity of 10 kOe at 150 °C, while achieving a remarkable coercivity increment of 12.97 kOe at room temperature. Microstructural analysis reveals that conventional diffusion converts triple junction phases into hexagonal Nd₂O₃, degrading coercivity by facilitating reversed domain nucleation, whereas LTD-diffusion maintains the original cubic Nd₂O₃ structure, thereby enhancing coercivity. The LTD sintering promotes the enrichment of Pr and Al elements at the grain boundaries, improving intergranular fluidity and thus creating favorable channels for the subsequent Tb diffusion. This not only increases the diffusion depth of Tb, but also improves the Tb concentration gradient and effectively improves the utilization efficiency of heavy rare earth. LTD technique offers a novel approach for fabricating high-performance Nd-Ce-Fe-B permanent magnets.

为了进一步提高扩散效率，降低制备高性能Nd-Fe-B磁体的成本，采用低温延迟烧结的方法对双层涂层Nd-Ce-Fe-B烧结磁体进行了晶界扩散。结果表明，在150°C时，ltd扩散磁体的矫顽力保持在10 kOe，而在室温下，矫顽力增加了12.97 kOe。显微组织分析表明，常规扩散将三结相转变为六边形Nd2O3，通过促进反畴成核而降低矫顽力，而有限扩散保持了Nd2O3的原始立方结构，从而提高了矫顽力。LTD烧结促进了Pr和Al元素在晶界的富集，提高了晶间流动性，从而为后续的Tb扩散创造了有利的通道。这不仅增加了Tb的扩散深度，而且提高了Tb浓度梯度，有效提高了重稀土的利用效率。该技术为制备高性能Nd-Ce-Fe-B永磁体提供了一种新的方法。

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引用次数: 0

Strengthening of nano-Y2O3 dispersed Al10Co25Cr8Fe15Ni36Ti6 based ODS-high entropy alloys for high temperature applications 纳米y2o3分散Al10Co25Cr8Fe15Ni36Ti6基ods -高熵合金高温强化研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-27 DOI: 10.1016/j.intermet.2025.109046

Tukesh Ram Sahu, Subhas Ganguly, Sudip K. Sinha

In this study, Y₂O₃-reinforced Al₁₀Co₂₅Cr₈Fe₁₅Ni₃₆Ti₆ high entropy alloys (HEAs) were fabricated using mechanical alloying (MA) followed by spark plasma sintering (SPS). Following 30 h of milling, the phase composition of all four alloys results in the formation of a face-centered cubic (FCC) structure in addition to a body-centered cubic (BCC) solid solution structure. After consolidation via SPS at 900 °C, the presence of the FCC and Ni-Ti phases was detected in all alloys. Additionally, a minor garnet phase (Cr₂Fe₁₅Y₂) was identified in the alloys incorporating yttria (1, 2, 3 wt%). Analysis using X-ray diffraction (XRD) and High-Resolution Transmission Electron Microscopy (HR-TEM) indicates that the addition of Yttria nanoparticles restricts the grain growth of matrix alloys during SPS. The average grain size for alloys with 0 and 3 wt% Y₂O₃ was 280 nm–112 nm, respectively. The Y₂O₃-dispersed alloys demonstrated enhanced hardness and yield strength, recorded at 750 ± 7 H V and 1045 ± 13 MPa, respectively, for the 3 wt% Y₂O₃ dispersed alloy system. Notably, the novelty of these alloys lies in their microstructure, featuring a uniform distribution of Cr₂Fe₁₅Y₂ particles. The specific heat capacity of the composite increased with higher Y₂O₃ content. Thermal conductivity and diffusivity decreased with increasing Y₂O₃ content up to 2 wt%, but both properties exhibited a significant increase at 3 wt%, surpassing those at 1 and 2 wt%. This enhancement at 3 wt% Y₂O₃ suggests improved thermal transport properties, making this composition promising for high-temperature applications.

采用机械合金化（MA）和放电等离子烧结（SPS）制备了y2o3增强Al10Co25Cr8Fe15Ni36Ti6高熵合金（HEAs）。铣削30小时后，四种合金的相组成除形成体心立方（BCC）固溶结构外，还形成面心立方（FCC）结构。在900°C的SPS固结后，所有合金中都检测到FCC和Ni-Ti相的存在。此外，在含钇（1,2,3 wt%）的合金中发现了少量石榴石相（Cr2Fe15Y2）。x射线衍射（XRD）和高分辨率透射电镜（HR-TEM）分析表明，纳米钇的加入限制了SPS过程中基体合金的晶粒生长。Y2O3含量为0 wt%和3 wt%的合金的平均晶粒尺寸分别为280 nm ~ 112 nm。Y2O3分散合金的硬度和屈服强度分别为750±7 H V和1045±13 MPa。值得注意的是，这些合金的新颖之处在于它们的微观结构，具有均匀分布的Cr2Fe15Y2颗粒。随着Y2O3含量的增加，复合材料的比热容增大。当Y2O3含量增加到2 wt%时，导热系数和扩散系数下降，但当Y2O3含量增加到3 wt%时，导热系数和扩散系数显著增加，超过了1 wt%和2 wt%时的导热系数和扩散系数。在3 wt%的Y2O3下，这种增强表明热传递性能得到改善，使这种组合物在高温应用中有前景。

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引用次数: 0

Effect of microstructure defects on the impact resistance behavior of detonation-sprayed Fe-based amorphous coatings 微结构缺陷对爆轰喷涂铁基非晶涂层抗冲击性能的影响

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-24 DOI: 10.1016/j.intermet.2025.109045

Xu Ma , Haimin Zhai , Wensheng Li , Uladzimir Seniuts

In this study, a series of Fe-based amorphous coatings (AMCs) with different microstructures were prepared by controlling specific detonation spraying parameters. Impact tests were conducted under varying impact forces to elucidate the influence of microstructural features on the impact properties of Fe-based AMCs. The results demonstrate that the hardness of all coatings exceeds that of the 316L stainless steel (SS) substrate. During impact, no significant spalling was observed in any coating, indicating good coordinated deformation capability with the substrate. The primary impact damage mode was cohesive failure. The critical impact failure energy range for the AMCs was determined to be between 20.48 J and 24.50 J. Notably, the crystallinity, the number of unfused powder particles, and the porosity of the AMC were found to be positively correlated with its impact resistance. This enhancement is attributed to the fact that pores within the coating can absorb a portion of the impact energy and impede crack propagation, while interfaces around unmelted particles provide paths for micro-cracking that dissipate energy.

本研究通过控制特定爆轰喷涂参数，制备了一系列具有不同微观结构的铁基非晶涂层（AMCs）。通过不同冲击力下的冲击试验，研究了微观结构特征对铁基碳纤维冲击性能的影响。结果表明，各涂层的硬度均超过316L不锈钢基体。在冲击过程中，任何涂层均未观察到明显的剥落，表明与基体具有良好的协调变形能力。主要冲击破坏模式为内聚破坏。确定了AMC的临界冲击破坏能范围在20.48 ~ 24.50 J之间。值得注意的是，AMC的结晶度、未熔粉颗粒数和孔隙率与其抗冲击性呈正相关。这种增强归因于涂层内的孔隙可以吸收部分冲击能量并阻碍裂纹扩展，而未熔化颗粒周围的界面为微裂纹提供了消散能量的路径。

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引用次数: 0

Enhanced strength-ductility synergy in cold-sprayed CoCrFeNi-Ti high-entropy alloys via integrated post-processing strategy 综合后处理策略增强冷喷涂CoCrFeNi-Ti高熵合金的强度-塑性协同效应

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-24 DOI: 10.1016/j.intermet.2025.109047

Xiaping Fan , Qingxu Tian , Xin Chu , Xiao Zhou , Peter K. Liaw , Yang Tong , Shuying Chen , Fanchao Meng

Cold spray technology faces challenges in achieving optimal mechanical properties due to weak interparticle bonding. This study addresses these limitations through post-processing of cold-sprayed CoCrFeNi-based high-entropy alloys, investigating the effects of heat treatment (HT) and combined heat treatment with hot rolling (HT + HR) on CoCrFeNi and CoCrFeNi+4 at% Ti bulk materials. The HT + HR process can notably help improve mechanical properties, with CoCrFeNi and CoCrFeNi+4 at% Ti achieving average ultimate tensile strength of 719.37 MPa and 825.12 MPa, and average fracture elongation of 44.18 % and 37.92 %, respectively. This good strength-ductility combination resulted from enhanced atomic diffusion during heat treatment, complete metallurgical bonding through hot rolling, and optimized Ti-induced strengthening. Microstructural analysis revealed a transition from brittle to ductile fracture behavior with reduced porosity and elemental segregation. TEM analysis showed complex phase evolution (Ni₃Ti, Ti₂Ni, and pure Ti regions) formed through Ti diffusion during thermal processing. Post-tensile TEM observations revealed multiple deformation mechanisms, (slip bands, dislocation accumulation around Ti particles, and deformation twins) contributing to excellent strength-ductility balance. Quantitative analysis demonstrated that while dislocation strengthening dominates in heat-treated samples, precipitation strengthening becomes primary after hot rolling. The 4 at% Ti addition optimizes properties through both solid solution and precipitation strengthening. This work demonstrates an effective strategy for fabricating high-performance HEA components via cold spray technology.

由于颗粒间结合较弱，冷喷涂技术在实现最佳力学性能方面面临挑战。本研究通过对冷喷涂CoCrFeNi基高熵合金的后处理来解决这些局限性，研究热处理（HT）和热轧结合热处理（HT + HR）对CoCrFeNi和CoCrFeNi+4 at% Ti块体材料的影响。高温+高温处理能显著提高合金的力学性能，在% Ti条件下，CoCrFeNi和CoCrFeNi+4合金的平均极限抗拉强度分别为719.37 MPa和825.12 MPa，平均断裂伸长率分别为44.18%和37.92%。这种良好的强度-塑性组合是由于热处理过程中原子扩散增强、热轧过程中完全的冶金结合以及优化的ti诱导强化。显微组织分析表明，随着孔隙度和元素偏析的降低，断裂行为从脆性向韧性转变。TEM分析表明，热处理过程中Ti扩散形成复杂的相演化（Ni3Ti、Ti2Ni和纯Ti区）。拉伸后的TEM观察揭示了多种变形机制（滑移带、Ti颗粒周围的位错积累和变形孪晶），有助于实现良好的强度-塑性平衡。定量分析表明，热处理试样中位错强化为主，热轧后析出强化为主。添加4 at% Ti通过固溶和沉淀强化优化了性能。本研究展示了一种利用冷喷涂技术制造高性能HEA部件的有效策略。

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引用次数: 0

Tribological and tribo-corrosion properties of Al-Cr-V-Ni eutectic high-entropy alloys in dry and artificial seawater Al-Cr-V-Ni共晶高熵合金在干海水和人工海水中的摩擦学和摩擦腐蚀性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-23 DOI: 10.1016/j.intermet.2025.109044

Caiying Chen , Li Jiang , Xin Liu , Hui Li , Hui Liang , Wei Qi , Zhiqiang Cao , Tongmin Wang

Eutectic high-entropy alloys (EHEAs) have emerged as promising structural materials for aerospace and marine applications due to their exceptional combination of mechanical properties, thermal stability, corrosion resistance, and wear resistance derived from their unique microstructural features and compositional complexity. This work proposes the lightweight EHEAs of Al_1.37CrVNi_1.5 and AlCrVNi_1.7 featuring BCC/B2 and BCC/L2₁ structures, respectively, with remarkably low densities of 5.72 and 6.22 g/cm³. Both alloys exhibit good wear resistance under dry sliding conditions, demonstrating friction coefficients of 0.51 and 0.49, respectively. The wear rates are determined to be on the order of 10⁻⁵ mm³/(N·m) for both materials. Al_1.37CrVNi_1.5 EHEA shows exceptional performance in seawater, achieving a low friction coefficient of 0.25 and low wear rate of 1.63 × 10⁻⁶ mm³/(N·m). Meanwhile, it exhibits excellent corrosion resistance in seawater, with a low corrosion current of 6.41 × 10⁻⁷ A/cm². The passivation capability of the alloy is significantly improved compared with that of the conventional Ti-6Al-4V alloy. Consequently, these EHEAs exhibit significant potential for aviation and marine applications, where superior wear-corrosion resistance is essential.

共晶高熵合金（EHEAs）由于其独特的微观结构特征和成分复杂性，具有优异的机械性能、热稳定性、耐腐蚀性和耐磨性，已成为航空航天和船舶应用的有前途的结构材料。本文提出了Al1.37CrVNi1.5和AlCrVNi1.7的轻量化EHEAs，分别具有BCC/B2和BCC/L21结构，密度非常低，分别为5.72和6.22 g/cm3。两种合金在干滑动条件下均表现出良好的耐磨性，摩擦系数分别为0.51和0.49。两种材料的磨损率均为10−5 mm3/（N·m）。Al1.37CrVNi1.5 EHEA在海水中表现出优异的性能，摩擦系数为0.25，磨损率为1.63 × 10−6 mm3/（N·m）。同时，在海水中表现出优异的耐腐蚀性，腐蚀电流低，为6.41 × 10−7 a /cm2。与传统的Ti-6Al-4V合金相比，该合金的钝化能力得到了显著提高。因此，这些EHEAs在航空和船舶应用中显示出巨大的潜力，在这些应用中，卓越的耐磨损性是必不可少的。

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引用次数: 0

Improved hydrogen storage capacity of Ti37V40Mn23 + 10 wt% ZrxNiy alloys by heat treatment 热处理提高了Ti37V40Mn23 + 10wt % ZrxNiy合金的储氢能力

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2025-10-22 DOI: 10.1016/j.intermet.2025.109043

Qihao Xiang , Xiaoyu Chen , Kaixiang Wang , Qiang Tao , Ruirun Chen

This study proposes a breakthrough strategy synergistically coupling Zr-Ni alloying with heat treatment to overcome the intrinsic kinetics-capacity trade-off in vanadium-based solid-solution hydrogen storage alloys. Atomically optimized Zr_xNi_y (x:y = 1:1, 9:11, 7:10, 8:21) additives were introduced into Ti₃₇V₄₀Mn₂₃, fabricating Ti₃₇V₄₀Mn₂₃ + 10 wt% Zr_xNi_y alloys via vacuum non-consumable electrode arc melting, followed by 1173 K/2 h heat treatment and water quenching. Analysis using XRD and SEM reveals that Zr_xNi_y addition significantly increases the accumulation of the C14 Laves phase. Hydrogen absorption kinetics for all alloys followed a geometric contraction model (R² > 0.997), governed by nucleation-growth kinetics. Specifically, The Ti₃₇V₄₀Mn₂₃ + 10 wt% Zr₈Ni₂₁ alloy achieved a hydrogen uptake capacity of 2.88 wt% at 303 K, exhibiting the fastest absorption kinetics with 92.0 % of its maximum capacity attained within the initial minute. This superior performance is attributed to variations in specific surface area induced by phase composition. Furthermore, Zr₈Ni₂₁ exhibited a hydrogen desorption capacity of 1.42 wt%, compared to only 0.82 wt% for ZrNi. The main reasons are that the appropriate amount of C14 phase provides effective channels for hydrogen diffusion during desorption, as well as the formation of predominantly readily decomposable VH₂ in the hydride.

本研究提出了一种将Zr-Ni合金与热处理协同耦合的突破性策略，以克服钒基固溶储氢合金固有的动力学-容量权衡。将原子优化的ZrxNiy （x:y = 1:1, 9:11, 7:10, 8:21）添加剂添加到Ti37V40Mn23中，通过真空非耗材电极电弧熔炼制备Ti37V40Mn23 + 10 wt% ZrxNiy合金，然后进行1173 K/2 h热处理和水淬。XRD和SEM分析表明，ZrxNiy的加入显著增加了C14 Laves相的富集。所有合金的吸氢动力学均服从几何收缩模型（R2 > 0.997），受成核生长动力学支配。具体而言，Ti37V40Mn23 + 10 wt% Zr8Ni21合金在303 K时的吸氢量为2.88 wt%，表现出最快的吸氢动力学，在初始分钟内达到最大容量的92.0%。这种优越的性能归因于相组成引起的比表面积的变化。此外，Zr8Ni21的氢解吸能力为1.42 wt%，而ZrNi的氢解吸能力仅为0.82 wt%。其主要原因是，在解吸过程中，适量的C14相为氢的扩散提供了有效的通道，并在氢化物中形成了以易分解为主的VH2。

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引用次数: 0