International Journal of Refractory Metals & Hard Materials最新文献_第7页

Preparation and mechanical properties of 90 W-Ni-Cu-Sn alloy 90w - ni - cu - sn合金的制备及其力学性能

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-31 DOI: 10.1016/j.ijrmhm.2025.107635

Tianhao Zhao, Mingchuan Yang, Meng Wang, Rongmei Luo

A 90 W-Ni-Cu-Sn alloy system was prepared via liquid-phase sintering, and its dynamic mechanical properties were investigated. By adjusting the Ni/Cu/Sn ratio and sintering temperature, the regulatory mechanism of tin element on alloy microstructure evolution and dynamic mechanical performance was revealed. Samples were fabricated using cold isostatic pressing (CIP) and hydrogen atmosphere sintering at temperatures ranging from 1150 °C to 1350 °C. The resulting materials were characterized through SEM, EDS, XRD, and mechanical testing—including quasi-static and dynamic compression as well as Vickers hardness measurements—to analyze density, grain size, and failure mechanisms. Results demonstrate that Sn addition significantly reduces liquid-phase sintering temperature, achieving 99.1 %–99.4 % relative density while reducing average grain size by 30 % compared to conventional alloys. Tin incorporation elevates quasi-static yield strength to 858 MPa; under dynamic compression, yield strength reaches 1700 MPa with thermal softening dominating plastic deformation, promoting adiabatic shear band (ASB) propagation along W-matrix interfaces.Microstructural analysis indicates that the synergistic effect of fine grain size and lower sintering temperatures may promote localized dynamic recrystallization processes, thereby facilitating the formation of ASBs. This work elucidates the optimization mechanism of Sn on tungsten alloy's dynamic mechanical properties, providing theoretical foundations for developing high-performance armor-piercing penetrator materials.

采用液相烧结法制备了90w - ni - cu - sn合金体系，并对其动态力学性能进行了研究。通过调节Ni/Cu/Sn比和烧结温度，揭示了锡元素对合金组织演变和动态力学性能的调控机理。样品的制备采用冷等静压（CIP）和氢气气氛烧结，温度范围为1150℃至1350℃。通过SEM， EDS， XRD和力学测试（包括准静态和动态压缩以及维氏硬度测量）对所得材料进行了表征，分析了密度，晶粒尺寸和破坏机制。结果表明，添加锡显著降低了液相烧结温度，相对密度达到99.1% ~ 99.4%，平均晶粒尺寸比常规合金减小30%。锡的掺入使准静态屈服强度提高到858 MPa；在动压缩下，屈服强度达到1700 MPa，热软化主导塑性变形，促进绝热剪切带（ASB）沿w -基体界面扩展。显微组织分析表明，细晶粒尺寸和较低烧结温度的协同作用可以促进局部动态再结晶过程，从而促进asb的形成。阐明了锡对钨合金动态力学性能的优化机理，为研制高性能穿甲弹材料提供了理论基础。

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引用次数: 0

Influence of W content on the room and elevated-temperature properties of Cu-W composites fabricated by hot isostatic pressing W含量对热等静压Cu-W复合材料室温和高温性能的影响

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-29 DOI: 10.1016/j.ijrmhm.2025.107645

Bingbing Shang , Ke Jing , Meng Zhou , Yi Zhang , Baohong Tian , Chunhe Chu , Huiwen Guo , Jin Zou

This study highlights the pivotal role of hot isostatic pressing (HIP) as a near-net-shape manufacturing method for fabricating Cu-W composites. The effect of W content on microstructure and properties was systematically evaluated. HIP-processed samples were characterized by SEM, TEM, and EBSD, while tensile properties, high-temperature hardness, and overall high-temperature stability were evaluated to elucidate the intrinsic relationships among processing, structure, and performance. The results demonstrate that under the combined densification effect of high temperature and pressure, increasing W content effectively refines the grain size, with the most significant effect observed at 20 wt% W, where the average grain size remains at 0.7 μm. TEM observations indicate that HIP promotes a uniform multiscale dispersion of nano-sized W particles and achieves grain refinement through grain boundary pinning. In the composite containing 20 wt% W, an optimal W phase distribution is achieved: grain boundary pinning significantly enhances strength, while intragranular dispersion maintains continuous electrical pathways. This refined microstructure enables a balanced improvement in both electrical conductivity and strength, resulting in a final product with 79.6 % IACS electrical conductivity, 309 W/(m·K) thermal conductivity, and 347 MPa tensile strength. This work systematically highlights the role of the HIP near-net-shape process in controlling the microstructure and overall properties of Cu-W composites, providing a theoretical basis and practical guidance for the efficient preparation of high-performance Cu-W composites.

本研究强调了热等静压（HIP）作为制造Cu-W复合材料的近净形状制造方法的关键作用。系统评价了W含量对合金组织和性能的影响。通过SEM、TEM和EBSD对热处理后的样品进行了表征，并对拉伸性能、高温硬度和整体高温稳定性进行了评估，以阐明工艺、结构和性能之间的内在关系。结果表明：在高温高压复合致密化作用下，增加W含量可以有效细化晶粒尺寸，当W含量为20 wt%时效果最显著，平均晶粒尺寸保持在0.7 μm；TEM观察表明，HIP促进了纳米W颗粒的均匀多尺度分散，并通过晶界钉住实现了晶粒细化。在含有20 wt% W的复合材料中，实现了最佳W相分布：晶界钉住显著提高了强度，而晶内弥散保持了连续的电通路。这种精致的微观结构使得导电率和强度得到了平衡的提高，最终产品的导电率为79.6%，导热系数为309 W/(m·K)，抗拉强度为347 MPa。本工作系统地突出了HIP近净成形工艺在控制Cu-W复合材料微观结构和整体性能中的作用，为高效制备高性能Cu-W复合材料提供了理论依据和实践指导。

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引用次数: 0

Influences of Co content and sintering temperature on microstructure and mechanical properties of WC–Co cemented carbides fabricated via the W–WC–C–Co route Co含量和烧结温度对W-WC-C-Co工艺制备的WC-Co硬质合金组织和力学性能的影响

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-26 DOI: 10.1016/j.ijrmhm.2025.107639

Xuewei Zhu , Hengyang Sun , Shuo Wang , Xiaofeng Wei , Wei Su

Employing the W–WC–C–Co route, WC–Co cemented carbides with dual-scale and platelet-like structures were prepared by low-pressure sintering. The effects of Co content (6, 9, 12, 15 wt%) and sintering temperature (ranging from 1400 °C to 1475 °C) on the microstructure, density, and mechanical properties were systematically investigated. The results indicate that the increased Co content and/or sintering temperature facilitate the growth of WC grains, accompanied with the enhancement of the density and the platelet-like degree of WC grains. In addition, the increased platelet-like degree of WC grains can, to a certain extent, compensate for the reduction in hardness and transverse rupture strength triggered by the coarsening of WC grains. Therefore, the optimal sintering temperature is determined to be 1425 °C for WC–Co cemented carbides with Co content ≥9 wt%, whereas it is 1450 °C for WC–6Co cemented carbide. Profiting from the dual-scale and platelet-like structures, WC–Co cemented carbides exhibit excellent mechanical properties. Specifically, WC–9Co cemented carbide sintered at 1425 °C showcases a hardness of 1543 HV₃₀, a transverse rupture strength of 3831 MPa, and a fracture toughness of 17.7 MPa·m^1/2.

采用W-WC-C-Co路线，采用低压烧结法制备了具有双鳞片状结构的WC-Co硬质合金。系统研究了Co含量（6、9、12、15 wt%）和烧结温度（1400 ~ 1475℃）对合金显微组织、密度和力学性能的影响。结果表明，Co含量的增加和烧结温度的升高有利于WC晶粒的生长，同时WC晶粒的密度和片状程度也有所提高。此外，WC晶粒血小板样程度的提高可以在一定程度上弥补WC晶粒粗化所导致的硬度和横向断裂强度的降低。因此，Co含量≥9wt %的WC-Co硬质合金的最佳烧结温度为1425℃，WC-6Co硬质合金的最佳烧结温度为1450℃。WC-Co硬质合金具有双尺度和片状结构，具有优异的力学性能。其中，1425℃烧结WC-9Co硬质合金硬度为1543 HV30，横向断裂强度为3831 MPa，断裂韧性为17.7 MPa·m1/2。

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引用次数: 0

In-situ TiN formation and microstructural evolution in WC–Co–Ti composites via gas-phase nitridation and spark plasma sintering 气相氮化和放电等离子烧结WC-Co-Ti复合材料TiN的原位生成和显微组织演化

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-25 DOI: 10.1016/j.ijrmhm.2025.107638

Ammad Ali , Kee-Ryung Park , Yoseb Song , Da-Woon Jeong , Muhammad Aneeq Haq , Bum Sung Kim

This study investigates in-situ TiN formation in WC–Co–Ti composites processed by high-energy ball milling, gas-phase nitridation, and spark plasma sintering (SPS). The optimized composite was consolidated by SPS at a peak temperature of 1250 °C, a holding time of 10 min, and an applied pressure of 50 MPa. Based on XRD phase evolution in nitrided powders and SEM/EDS observations of the consolidated microstructure, a diffusion-assisted formation pathway is proposed, in which nitrogen transport through the binder/interface region promotes TiN formation near Ti-containing domains and WC–binder interfaces. The resulting Ti–N-enriched interfacial regions contribute to localized WC grain-growth suppression and influence fracture behavior through crack deflection at heterogeneous interfaces. The optimized composite achieved a Vickers hardness of ∼1870 HV and a fracture toughness of 6.8 MPa·m¹ᐟ². These results establish gas-phase nitridation combined with SPS as an effective route to introduce Ti–N-enriched interfacial regions and tailor the phase/microstructure of WC–Co-based cemented carbides, leading to an improved hardness–toughness balance.

本研究研究了高能球磨、气相氮化和放电等离子烧结（SPS）处理WC-Co-Ti复合材料中TiN的原位形成。优化后的复合材料在峰值温度为1250℃，保温时间为10 min，施加压力为50 MPa的条件下进行SPS固结。基于氮化粉末的XRD相演化和SEM/EDS对固结微观结构的观察，提出了一种扩散辅助形成途径，其中氮通过粘结剂/界面区域的输运促进了TiN在含ti畴和wc -粘结剂界面附近的形成。由此产生的富ti - n界面区有助于局部抑制WC晶粒生长，并通过非均质界面处的裂纹挠曲影响断裂行为。优化后的复合材料的维氏硬度为~ 1870 HV，断裂韧性为6.8 MPa·m1 2。这些结果表明，气相氮化结合SPS是引入富ti - n界面区域的有效途径，可以调整wc - co基硬质合金的相/微观结构，从而改善硬度和韧性平衡。

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引用次数: 0

High-temperature oxidation behavior of Ti(C,N)-Mo2C-Ni cermets in air Ti(C，N)-Mo2C-Ni陶瓷在空气中的高温氧化行为

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-24 DOI: 10.1016/j.ijrmhm.2025.107643

Shengyun Xiao , Weicai Wan , Mengxia Liang , Yanli Chen , Zongyuan Wang , Jiupeng Song , Kunyang Fan

The oxidation behavior of Ti(C,N)-Mo₂C-Ni cermets prepared by powder metallurgy was systematically investigated under a wide temperature range of 300 °C – 900 °C with a dwell time of 2 h at each temperature. Results demonstrated that the elevated temperature converted the TiO₂ on the oxidized surface of the cermets from planar to massive (rutile). Simultaneously, the outward diffusion of substrate cations (Ti⁴⁺ and Ni²⁺) was accelerated, leading to intensified oxidation of the cermets. At 900 °C, NiO + TiO₂ composite precipitated on the surface of the TiO₂ layer, transforming the original single layer oxide film into a bilayer structure. At 700 °C, it was found that thickening rate of the surface oxide film gradually decreased after a short period of increasing. This benefits from the formation of a denser and interlocked layer composed of NiO and TiO₂.

系统地研究了粉末冶金法制备Ti(C，N)- mo2c - ni陶瓷在300 ~ 900℃宽温度范围内的氧化行为，每个温度停留时间为2h。结果表明，温度升高使金属陶瓷氧化表面的TiO2由平面型转变为块状（金红石型）。同时，基体阳离子（Ti4+和Ni2+）向外扩散加速，导致金属陶瓷的氧化加剧。在900℃时，NiO + TiO2复合材料在TiO2层表面析出，将原有的单层氧化膜转变为双层结构。在700℃时，发现表面氧化膜的增厚速率在短时间内增加后逐渐降低。这得益于由NiO和TiO2组成的致密互锁层的形成。

引用次数: 0

Corrigendum to Novel WC-based cemented carbides with Fe-Cr-V binders with improved fracture toughness for neutron shielding applications [Volume 136, April 2026, 107583] 新型含Fe-Cr-V粘结剂的wc基硬质合金的勘误表，用于中子屏蔽应用，提高断裂韧性[vol . 136, April 2026, 107583]

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-24 DOI: 10.1016/j.ijrmhm.2025.107634

D. Müller , I. Konyashin , B. Ries , J. Pötschke , A. Michaelis

引用次数: 0

Effects of nanoprecipitations on microstructure evolution, mechanical properties, corrosion and wear resistances of TiC/Inconel 625 metal matrix composites manufactured by laser direct energy deposition 纳米沉淀对激光直接能量沉积TiC/Inconel 625金属基复合材料显微组织演变、力学性能和耐蚀磨损性能的影响

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-23 DOI: 10.1016/j.ijrmhm.2025.107641

Zhaoyang Liu , Qingqun Liu

Submicron TiC particles reinforced Inconel 625 (TiC/IN625) metal matrix composites were additively fabricated by laser direct energy deposition. The effect of nanoprecipitations on microstructure evolution, mechanical properties and corrosion resistance of the TiC/IN625 composites were studied. The results showed that the TiC particles completely decomposed into Ti and C atoms, and reprecipitated in the form of MC (M = Ti, Mo, Nb) carbides and Al₂O₃-MC core-shell nanogranules, contributing to the grain refinement and dramatic dislocation multiplication and pile-up. Due to the synergistic strengthening effect of nanoprecipitations including Al₂O₃ oxides, MC carbides, Al₂O₃-MC core-shell nanogranules and Laves phase, along with the solution strengthening effect of the Ti atoms in IN625 matrix and grain refinement, the microhardness was significantly improved from 267 HV to 331 HV with the increasing TiC content from 0.0 to 3.5 wt%, and the ultimate tensile strength increased from 829.1 MPa to 1020.9 MPa with a synchronous deterioration of elongation from 53.6 % to 19.3 %. The corrosion resistance was deteriorated by aggravated pit corrosions around these increased MC carbides and Al₂O₃-MC core-shell nanogranules in comparison to pure IN625 alloy. The wear resistance was significantly improved by the increasing TiC content. The friction coefficient and wear rate achieved the minimum values of 0.59 and 4.23 × 10⁻⁵ mm/(N⋅m), respectively.

采用激光直接能量沉积法制备了亚微米TiC颗粒增强Inconel 625 （TiC/IN625）金属基复合材料。研究了纳米沉淀对TiC/IN625复合材料显微组织演变、力学性能和耐蚀性能的影响。结果表明：TiC颗粒完全分解为Ti和C原子，并以MC （M = Ti, Mo, Nb）碳化物和Al2O3-MC核壳纳米颗粒的形式析出，导致晶粒细化，位错增殖和堆积明显；由于Al2O3氧化物、MC碳化物、Al2O3-MC核壳纳米颗粒和Laves相等纳米沉淀的协同强化作用，以及IN625基体中Ti原子的固溶强化作用和晶粒细化作用，随着TiC含量从0.0 wt%增加到3.5 wt%，显微硬度从267 HV显著提高到331 HV。拉伸强度由829.1 MPa提高到1020.9 MPa，延伸率由53.6%下降到19.3%。与纯IN625合金相比，增加的MC碳化物和Al2O3-MC核壳纳米颗粒周围的凹坑腐蚀加剧，腐蚀性能下降。随着TiC含量的增加，其耐磨性显著提高。摩擦系数和磨损率分别达到最小值0.59和4.23 × 10−5 mm/（N·m）。

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引用次数: 0

Lightweight diamond/WC–Co composites achieve synergistic hardness-toughness enhancement via high-pressure sintering 轻质金刚石/ WC-Co复合材料通过高压烧结实现了硬度和韧性的协同增强

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-23 DOI: 10.1016/j.ijrmhm.2025.107637

Yinxing Su , Qian Li , Duanwei He , Jiawei Zhang

The widely recognized inverse correlation between hardness and toughness presents a major obstacle to achieving both properties simultaneously, particularly in cemented carbides. Diamond has been regarded as an ideal reinforcing phase for WC-Co composites due to its ultra-high hardness (which enhances overall composite hardness), high bulk modulus (which promotes crack deflection, blunting, and bifurcation thereby improving toughness), and low density (which enables lightweighting). However, under conventional sintering conditions, diamond undergoes severe graphitization, causing its strengthening effect to fail and leading to significant performance loss. In contrast, high-pressure high-temperature (HPHT) sintering fundamentally overcomes this issue: the applied high pressure stabilizes the diamond phase by elevating its graphitization temperature, while simultaneously enhancing interfacial bonding with the WC-Co matrix. By optimizing composition and sintering parameters, a WC-10 vol% Co-50 vol% diamond composite achieved near-full densification (99.02 % relative density), exhibiting high hardness (28.16 GPa), enhanced fracture toughness (14.68

MPa ∙ m^{1 / 2}

), good electrical conductivity (

8.36 \times 10^{- 5} Ω ∙ m

), for electrical discharge machining (EDM) capability, and a significantly reduced density of 8.81 g/cm³ (approximately 40 % lighter than conventional WC-Co). This unique composite provides an outstanding balance of performance and lightweight characteristics for advanced applications requiring high strength, toughness, and reduced weight.

人们普遍认为硬度和韧性之间的负相关关系是同时实现这两种性能的主要障碍，特别是在硬质合金中。金刚石被认为是WC-Co复合材料的理想增强相，因为它具有超高硬度（提高复合材料的整体硬度）、高体积模量（促进裂纹偏转、钝化和分叉，从而提高韧性）和低密度（实现轻量化）。然而，在常规烧结条件下，金刚石会发生严重的石墨化，导致其强化效果失效，性能损失显著。相比之下，高压高温烧结（HPHT）从根本上克服了这一问题：施加的高压通过提高石墨化温度来稳定金刚石相，同时增强了与WC-Co基体的界面结合。通过优化成分和烧结参数，WC-10 vol% Co-50 vol%金刚石复合材料实现了接近完全致密化（相对密度99.02%），具有高硬度（28.16 GPa），增强断裂韧性（14.68 MPa∙m1/2），良好的电导率（8.36×10−5Ω∙m），具有电火花加工（EDM）能力，并且密度显著降低至8.81 g/cm3（比常规WC-Co轻约40%）。这种独特的复合材料为需要高强度、高韧性和轻量化的先进应用提供了出色的性能和轻量化平衡。

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引用次数: 0

Investigating into the mechanisms of high temperature strength of refractory high-entropy alloys 耐火高熵合金高温强度的机理研究

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-23 DOI: 10.1016/j.ijrmhm.2025.107640

Sai Anandhi Seetharaman, Soumyadipta Maiti, Ambesh Gupta, Beena Rai

The yield strength plateau of two BCC refractory high entropy alloys (RHEAs) – MoNbTaVW and MoNbTaW was examined through hybrid Monte Carlo and molecular dynamics (MC/MD) simulations. By analyzing atomic diffusivities derived from vacancy formation and migration energies around the edge dislocation cores, the number of critical atomic swaps were calculated at different temperatures. Using hybrid MC/MD simulations of these critical swaps, we demonstrate that above 1400 K, the stress required to move the dislocations gets saturated, indicating the effect of Dynamic Strain Ageing (DSA) via “cross core motion”. Further simulations on random solid solutions (0 MC swaps) revealed a similar plateau effect at the intermediate temperatures. This was attributed to the additional athermal stress arising from lattice distortions due to solid solution strengthening. Our findings suggest that the yield strength plateau results from an interplay between the DSA-driven diffusion process and athermal stress. Specifically, the plateau emerges from DSA mechanisms in the presence of atomic diffusion, whereas in the absence of diffusion, it is governed by athermal statistical lattice distortions. This dual mechanism framework provides a comprehensive explanation for the experimentally observed Yield strength behavior in RHEAs at intermediate temperatures.

采用蒙特卡罗和分子动力学（MC/MD）模拟研究了两种BCC难熔高熵合金（MoNbTaVW和MoNbTaW）的屈服强度平台。通过分析由空位形成引起的原子扩散系数和边缘位错核心周围的迁移能，计算了不同温度下的临界原子交换次数。通过混合MC/MD模拟这些临界交换，我们证明在1400 K以上，移动位错所需的应力达到饱和，表明动态应变老化（DSA）通过“交叉核运动”的影响。对随机固溶体（0 MC交换）的进一步模拟表明，在中等温度下也存在类似的平台效应。这是由于固溶体强化引起的晶格畸变引起的额外非热应力。我们的研究结果表明，屈服强度平台是dsa驱动的扩散过程和非热应力相互作用的结果。具体来说，在原子扩散存在的情况下，平台从DSA机制中出现，而在没有扩散的情况下，它由非热统计晶格畸变控制。这种双重机制框架为实验观察到的中间温度下RHEAs的屈服强度行为提供了全面的解释。

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引用次数: 0

A novel strategy of high-entropy nitride coating for cemented carbide cutting tool: Preparation, microstructure, mechanical and wear properties 硬质合金刀具高熵氮化涂层的制备、显微组织、力学性能和磨损性能

IF 4.6 2区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

International Journal of Refractory Metals & Hard Materials

Pub Date : 2025-12-22 DOI: 10.1016/j.ijrmhm.2025.107644

Keke Li, Wenting Shao, Ruilong Wen, Wei Yang, Shangkun Wu, Jian Chen

High-entropy nitrides (HENs) are emerging as next-generation protective coatings that offer superior performance over conventional nitrides on cutting tools. This study explores a new class of HEN coatings with the composition (AlTi_xNbCrZr)N (x = 0, 0.5, 1), alongside a conventional TiAlN coating, both deposited on cemented carbide substrates via magnetron sputtering. Comprehensive analyses were carried out to evaluate their microstructural characteristics, mechanical and wear properties. The results indicate that both TiAlN and (AlTi_xNbCrZr)N coatings exhibit a single-phase face-centered cubic (FCC) solid solution. Compared with the conventional TiAlN coating, HEN coatings exhibit significantly enhanced mechanical properties due to intensified Me-N covalent bonding and lattice distortion-induced energy barriers that impede dislocation motion and slip. As the Ti content increased, the (AlTi_xNbCrZr)N coatings displayed progressive improvements in mechanical performance, reaching a peak hardness of 46.06 GPa. This enhancement is consistent with the inverse Hall-Petch regime for sub-10 nm grain sizes, where grain coarsening enhances hardness by suppressing grain boundary sliding as the dominant deformation mechanism. In terms of wear resistance, the HEN coatings outperformed TiAlN, benefiting from solid solution strengthening driven by high entropy. Among (AlTi_xNbCrZr)N coatings, (AlTi_0.5NbCrZr)N demonstrates optimal wear resistance (wear rate: 4.18 × 10⁻⁸ mm³/N·m), attributed to balanced suppression of two failure pathways: (i) excessive abrasive particle formation from low-hardness coatings, and (ii) adhesive wear promoted by elevated Ti content through enhanced material adhesion at the ball-coating interface, leading to accelerated coating tearing failure. The dominant wear mechanisms were identified as adhesive wear and oxidative wear, with slight abrasive wear. These findings offer valuable insights and foundational data for advancing Ti alloy machining technologies.

高熵氮化物（HENs）正在成为新一代切削工具防护涂层，其性能优于传统氮化物。本研究探索了一类新的HEN涂层，其成分为（AlTixNbCrZr）N (x = 0,0.5, 1)，与传统的TiAlN涂层一起，通过磁控溅射沉积在硬质合金基体上。对其显微组织特征、力学性能和磨损性能进行了综合分析。结果表明：TiAlN和（AlTixNbCrZr）N涂层均表现为单相面心立方（FCC）固溶体；与传统的TiAlN涂层相比，HEN涂层的力学性能显著提高，这是由于Me-N共价键的增强和晶格畸变引起的能垒阻碍了位错运动和滑移。随着Ti含量的增加，（AlTixNbCrZr）N涂层的力学性能逐渐提高，硬度峰值达到46.06 GPa。这种增强与10 nm以下晶粒尺寸的逆Hall-Petch机制一致，晶粒粗化通过抑制晶界滑动作为主要变形机制来提高硬度。在耐磨性方面，HEN涂层优于TiAlN，受益于高熵驱动的固溶体强化。在（AlTixNbCrZr）N涂层中，（AlTi0.5NbCrZr）N涂层表现出最佳的耐磨性（磨损率为4.18 × 10−8 mm3/N·m），这是由于平衡抑制了两种失效途径：(1)低硬度涂层形成过多的磨粒；(2)升高的Ti含量通过增强材料在球-涂层界面的附着力而促进黏着磨损，从而加速涂层撕裂失效。主要的磨损机制是粘着磨损和氧化磨损，轻微的磨粒磨损。这些发现为推进钛合金加工技术提供了有价值的见解和基础数据。

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引用次数: 0