Intermetallics最新文献_第8页

Understanding the process-microstructure-property relationships in a L12-strengthened high-entropy alloy fabricated by binder jet 3D printing 粘结剂喷射3D打印制备l12强化高熵合金的工艺-显微组织-性能关系研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-06 DOI: 10.1016/j.intermet.2025.109122

Xiaohui Qin , Liran Huang , Pei Wang , Wentao Yan , Zhiqiang Fu

We report the fabrication of a L1₂-strengthened high-entropy alloy (HEA), Ni_27.7Cr₂₄Co_23.5Fe_15.7Mo_1.6Al₃Ti_4.5 (at. %), using binder jet 3D printing (BJ3DP), consisting of printing and subsequent sintering. The resulting alloy exhibits high strength and corrosion resistance. This study systematically investigates the interdependence among processing parameters, microstructural evolution, and resulting properties. Optimal printing parameters (50 μm layer thickness, 50 % binder saturation, 3 mm/s spreading speed) yielded a green density of ∼58 %. Subsequent sintering at 1280 °C for 4 h achieved the highest relative density of ∼99.2 %. The microstructural evolution during sintering governed L1₂ precipitation and porosity, which in turn dictated the mechanical properties and corrosion resistance. Superior performance was achieved after sintering at 1280 °C. This condition produced enhanced densification and refined L1₂ precipitates, resulting in a yield strength of ∼726 MPa, ultimate tensile strength of ∼1112 MPa, and elongation of ∼16.5 %. Conversely, sintering at 1290 °C caused partial melting and precipitate coarsening, which degraded both strength and corrosion resistance. Electrochemical tests in 3.5 wt% NaCl solution confirmed the optimal corrosion resistance of the 1280 °C sample, which exhibited a pitting potential (∼0.97 V_SCE) significantly higher than that of 316L stainless steel. In contrast, samples sintered below 1280 °C showed excessive porosity, while those above 1290 °C exhibited microstructural instability, both leading to severe pitting and galvanic corrosion. These results establish clear process–microstructure–property relationships for BJ3DP-fabricated HEAs and demonstrate a viable pathway for tailoring multifunctional performance through controlled processing.

本文报道了一种l12强化高熵合金（HEA） Ni27.7Cr24Co23.5Fe15.7Mo1.6Al3Ti4.5 (at。%)，采用粘合剂喷射3D打印（BJ3DP），由打印和随后的烧结组成。所得合金具有高强度和耐腐蚀性。本研究系统地探讨了工艺参数、微观结构演变和最终性能之间的相互依存关系。最佳打印参数（50 μm层厚度，50%粘合剂饱和度，3 mm/s扩散速度）产生的绿密度为~ 58%。随后在1280°C下烧结4小时，获得了最高的相对密度（~ 99.2%）。烧结过程中微观组织的演变控制了L12的析出和孔隙率，进而决定了材料的力学性能和耐蚀性。经1280℃烧结后，获得了优异的性能。该条件增强了致密化，细化了L12析出相，导致屈服强度为~ 726 MPa，极限抗拉强度为~ 1112 MPa，伸长率为~ 16.5%。相反，在1290℃下烧结会导致部分熔化和析出的粗化，从而降低强度和耐腐蚀性。在3.5 wt% NaCl溶液中进行的电化学测试证实，1280°C样品具有最佳的耐蚀性，其点蚀电位（~ 0.97 VSCE）显著高于316L不锈钢。1280℃以下烧结的试样孔隙度过高，1290℃以上烧结的试样微观组织不稳定，均导致严重的点蚀和电蚀。这些结果为bj3d制造的HEAs建立了清晰的工艺-微观结构-性能关系，并展示了通过控制加工定制多功能性能的可行途径。

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引用次数: 0

Achieving strength-ductility synergy in Ta/Ti Co-doped γ′-Ni3Al precipitates: An integrated theoretical and experimental investigation 在Ta/Ti共掺杂γ′-Ni3Al析出物中实现强度-延性协同：理论和实验的综合研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.intermet.2025.109120

Ziyi Ren , Yuchao Lin , Yongle Hu , Yonggang Tong , Pengfei Wu , Xiubing Liang , Jingzhong Fang , Xixi Ji , Kaiming Wang , Mingjun Zhang

γ′-Ni₃Al precipitate dictates elevated-temperature performance of the nickel-based superalloys but exhibit hardness deficiency under extreme thermomechanical loads. We devised a Ta and Ti co-doped strategy to overcome this deficiency, revealing atomic-scale synergistic strengthening mechanisms by experimental and theoretical methods. Optimal 12.5 at. % Ta doping enhances microhardness to 1023.6 Hv through the intensification of Ni-Ta covalent bonding. However, excessive Ta has been induced lattice instability. Ti effectively stabilizes the crystal structure via charge redistribution, with pronounced directional hybridization between Ti-3d and Ni orbitals establishes stable electron cloud configurations. Remarkably, the co-doped Ni₃Al_0.25Ta_0.25Ti_0.5 precipitate achieves exceptional mechanical performance, exhibiting a remarkable 49.4 % enhancement in microhardness to 1112.03 Hv compared to pristine γ′-Ni₃Al (744.33Hv) while maintaining superior plasticity. Furthermore, the γ′-Ni₃(Al, Ta, Ti)-strengthened ATT alloy exhibits a yield strength exceeding 1.2 GPa while retaining 20 % plasticity, achieving an exceptional strength-ductility synergy that is consistent with computational predictions. Critical strengthening is attributed to Ta and Ti elements directional reinforcement of Ni-Al bonds. Ta-5d/Ti-3d orbital hybridization induces an enhanced density of states near the Fermi level. The present work provides a design method for nickel-based superalloys with strength-ductility synergy.

γ′-Ni3Al析出决定了镍基高温合金的高温性能，但在极端热机械载荷下表现出硬度不足。我们设计了一种Ta和Ti共掺杂策略来克服这一缺陷，通过实验和理论方法揭示了原子尺度的协同强化机制。最佳12.5秒。% Ta通过强化Ni-Ta共价键，使合金显微硬度提高到1023.6 Hv。然而，过量的Ta会引起晶格不稳定。Ti通过电荷重分配有效地稳定了晶体结构，Ti-3d和Ni轨道之间明显的定向杂化建立了稳定的电子云构型。值得注意的是，共掺杂Ni3Al0.25Ta0.25Ti0.5析出物具有优异的力学性能，与原始γ′-Ni3Al （744.33Hv）相比，显微硬度提高了49.4%，达到1112.03 Hv，同时保持了优异的塑性。此外，γ′-Ni3（Al, Ta, Ti）强化ATT合金显示出超过1.2 GPa的屈服强度，同时保持20%的塑性，实现了与计算预测一致的卓越的强度-塑性协同作用。临界强化是由于Ta和Ti元素对Ni-Al键的定向强化。Ta-5d/Ti-3d轨道杂化诱导了费米能级附近态密度的增强。本工作为具有强塑性协同作用的镍基高温合金提供了一种设计方法。

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引用次数: 0

Microstructural and tribological characteristics of boroaluminized Monel K-500 superalloy 硼铝化蒙奈尔K-500高温合金的显微组织和摩擦学特性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-19 DOI: 10.1016/j.intermet.2025.109131

İlyas Türkmen

This study investigates the surface enhancement of Monel K-500 alloy through the boroaluminizing process. Boroaluminized layers were produced by sequential powder-pack boriding (850–950 °C, 6 h) followed by aluminizing at 750 °C for 6 h. Optical and scanning electron microscopy examinations demonstrated that the boroaluminized layers were compact, with a thickness of approximately 129–133 μm. Energy-dispersive X-ray spectroscopy (EDX) and X-ray diffraction (XRD) analyses were employed to identify the elemental distribution and phase composition of the layers. The layers formed in the boroaluminized samples consisted of various nickel borides, nickel aluminides, and complex intermetallic phases. The microhardness of the layers was measured to range from 890 HV to 1060 HV. Ball-on-disk wear tests carried out under dry sliding conditions at ambient temperature revealed that the boroaluminized samples exhibited a 3.2–3.6-fold improvement in wear resistance compared to the untreated substrate. Furthermore, the friction coefficient was reduced by approximately 1.8 times. In accordance with the Daimler-Benz Rockwell-C indentation tests, acceptable adhesion strength was confirmed exclusively for the BA90 sample. These results highlight the potential of boroaluminizing as an effective method for significantly enhancing the mechanical and tribological performance of Monel K-500, making it suitable for demanding applications.

研究了蒙乃尔K-500合金经硼渗铝处理后的表面强化效果。采用粉末包渗（850-950°C, 6 h）和750°C渗铝（6 h）法制备了硼铝层。光学和扫描电镜检查表明，硼铝层致密，厚度约为129-133 μm。利用能量色散x射线能谱（EDX）和x射线衍射（XRD）分析确定了各层的元素分布和相组成。在硼铝化样品中形成的层由各种镍硼化物、镍铝化物和复杂的金属间相组成。测得各层显微硬度在890hv ~ 1060hv之间。在干滑动条件下进行的球盘磨损试验表明，与未处理的衬底相比，硼铝化样品的耐磨性提高了3.2 - 3.6倍。摩擦系数降低了约1.8倍。根据戴姆勒-奔驰罗克韦尔- c压痕试验，仅为BA90样品确认了可接受的粘附强度。这些结果突出了硼铝化作为一种有效方法的潜力，可以显着提高蒙奈尔K-500的机械和摩擦学性能，使其适合苛刻的应用。

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引用次数: 0

Microstructure and properties of NiTi/NiTiNb ultrafine eutectic composite welded joints with superelasticity 超弹性NiTi/NiTiNb超细共晶复合焊接接头的组织与性能

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-15 DOI: 10.1016/j.intermet.2025.109133

Bo Feng , Ke Yang , Hui Shen , Zhixin Su , Jianhua Zhao , Yifan Wu , Shijie Hao

NiTi shape memory alloys (SMAs), as typical advanced functional intermetallics, have extensive applications. While their complex-structured components have been restricted by poor weldability. In this study, eutectic-composition NiTiNb wires were used as the interlayer to fabricate NiTi welded joints via laser welding, aiming to address the issues of porosity, brittle precipitations, and properties’ degradation in conventional NiTi welds. The results demonstrate that the welded joint exhibits a refined eutectic microcomposite. The high fluidity of the NiTiNb eutectic suppress the formation of porosity and brittle phases in the weld zone. Meanwhile, the NiTi constituent in the eutectic endows a continuous interface transition between the weld joint and the NiTi based sheets. The soft β-Nb phase in the eutectic mitigates the joint hardness and brittleness. In addition, this NiTi/NiTiNb welded composite achieves a tensile strain exceeding 10 % and a superelastic strain of over 5 %, both far outperforming the directly welded NiTi joint. This work provides a novel strategy for improving the weldability of NiTi SMAs, holding great potential for applications in functional devices.

NiTi形状记忆合金作为典型的高级功能金属间化合物，具有广泛的应用前景。而其结构复杂的部件由于焊接性差而受到限制。本研究采用共晶成分的NiTiNb丝作为中间层，通过激光焊接制备NiTi焊接接头，旨在解决传统NiTi焊缝存在的气孔、脆性析出和性能下降等问题。结果表明，焊接接头呈现出一种细化的共晶微观复合材料。NiTiNb共晶的高流动性抑制了焊缝区孔隙和脆性相的形成。同时，共晶中的NiTi成分使焊缝与NiTi基板之间的界面发生连续转变。共晶中较软的β-Nb相降低了接头的硬度和脆性。此外，这种NiTi/NiTiNb焊接复合材料的拉伸应变超过10%，超弹性应变超过5%，两者都远远优于直接焊接的NiTi接头。这项工作为提高NiTi sma的可焊性提供了一种新的策略，在功能器件中具有很大的应用潜力。

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引用次数: 0

Tuning magnetic frustration via composition: Spin-glass dynamics and phase diagrams of sigma-phase Fe–Cr–Ni alloys 通过成分调整磁挫折：sigma相Fe-Cr-Ni合金的自旋玻璃动力学和相图

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-11-28 DOI: 10.1016/j.intermet.2025.109109

Piotr Konieczny , Dominik Czernia , Stanisław M. Dubiel

A series of three sigma-phase Fe-Cr-Ni intermetallic compounds — Fe_45.8Cr₄₉Ni_5.2, Fe_50.7Cr_46.7Ni_2.6, and Fe_52.5Cr_45.55Ni_1.95 — were systematically studied using ac and dc magnetic susceptibility measurements to construct their respective magnetic phase diagrams in the temperature-field (H-T) space. These compounds, characterized by increasing Fe content and decreasing Cr and Ni content, all exhibit ferrimagnetic ordering below their critical temperatures (T_c), accompanied by significantly negative Curie-Weiss temperatures (θ = −461(22) K, −155(6) K, and −134(11) K, respectively), indicating strong antiferromagnetic interactions. A re-entrant magnetic behavior was observed in all samples, transitioning into a spin-glass state at lower temperatures. The degree of magnetic frustration, quantified by the degree of frustration (DOF), was found to increase with Cr and Ni content, peaking at DOF = 34 for Fe_45.8Cr₄₉Ni_5.2. The spin-glass state exhibits heterogeneity, comprising two substates with weak and strong irreversibility. The share of the spin-glass phase in the magnetic phase diagram diminishes as the Cr and Ni content increases. Analysis of the relative shift of the spin freezing temperature per decade of frequency, confirms that all compounds exhibit cluster spin-glass behavior.

采用交流和直流磁化率测量方法，系统研究了Fe-Cr-Ni金属间化合物Fe45.8Cr49Ni5.2、Fe50.7Cr46.7Ni2.6和Fe52.5Cr45.55Ni1.95在温度场（H-T）空间的磁相图。这些化合物的特征是Fe含量增加，Cr和Ni含量减少，在其临界温度（Tc）以下均表现出铁磁有序，并伴有显著的负居里-魏斯温度(θ分别= - 461(22)K, - 155(6) K和- 134(11)K)，表明具有强的反铁磁相互作用。在所有样品中都观察到可重入磁性行为，在较低温度下转变为自旋玻璃态。磁阻度（DOF）随Cr和Ni含量的增加而增加，Fe45.8Cr49Ni5.2在DOF = 34处达到峰值。自旋玻璃态表现出非均质性，包括弱不可逆性和强不可逆性两个基态。随着Cr和Ni含量的增加，自旋玻璃相在磁相图中的份额减小。分析了自旋冻结温度每十年频率的相对位移，证实了所有化合物都表现出团簇自旋玻璃行为。

{"title":"Tuning magnetic frustration via composition: Spin-glass dynamics and phase diagrams of sigma-phase Fe–Cr–Ni alloys","authors":"Piotr Konieczny , Dominik Czernia , Stanisław M. Dubiel","doi":"10.1016/j.intermet.2025.109109","DOIUrl":"10.1016/j.intermet.2025.109109","url":null,"abstract":"<div><div>A series of three sigma-phase Fe-Cr-Ni intermetallic compounds — Fe<sub>45.8</sub>Cr<sub>49</sub>Ni<sub>5.2</sub>, Fe<sub>50.7</sub>Cr<sub>46.7</sub>Ni<sub>2.6</sub>, and Fe<sub>52.5</sub>Cr<sub>45.55</sub>Ni<sub>1.95</sub> — were systematically studied using ac and dc magnetic susceptibility measurements to construct their respective magnetic phase diagrams in the temperature-field (<em>H</em>-<em>T</em>) space. These compounds, characterized by increasing Fe content and decreasing Cr and Ni content, all exhibit ferrimagnetic ordering below their critical temperatures (<em>T</em><sub>c</sub>), accompanied by significantly negative Curie-Weiss temperatures (<em>θ</em> = −461(22) K, −155(6) K, and −134(11) K, respectively), indicating strong antiferromagnetic interactions. A re-entrant magnetic behavior was observed in all samples, transitioning into a spin-glass state at lower temperatures. The degree of magnetic frustration, quantified by the degree of frustration (DOF), was found to increase with Cr and Ni content, peaking at DOF = 34 for Fe<sub>45.8</sub>Cr<sub>49</sub>Ni<sub>5.2</sub>. The spin-glass state exhibits heterogeneity, comprising two substates with weak and strong irreversibility. The share of the spin-glass phase in the magnetic phase diagram diminishes as the Cr and Ni content increases. Analysis of the relative shift of the spin freezing temperature per decade of frequency, confirms that all compounds exhibit cluster spin-glass behavior.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"189 ","pages":"Article 109109"},"PeriodicalIF":4.8,"publicationDate":"2026-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145617259","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Phase stability in a SiC/Mo5SiB2 (T2) diffusion couple at 1700 °C SiC/Mo5SiB2 （T2）扩散偶联1700℃时的相稳定性

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-11-27 DOI: 10.1016/j.intermet.2025.109100

J.R. Becker , L. Liu , C. Zhang , M. Niezgoda , J.H. Perepezko

To evaluate the phase stability, a diffusion couple experiment of Mo₅SiB₂ (T₂) and SiC in contact was conducted at 1700 °C for 150 h. The post-anneal bonded interface was examined by high-resolution scanning transmission electron microscopy (STEM). The results show no formation of other compounds and minimal interdiffusion between the two phases, indicating that T₂ and SiC are in thermodynamic equilibrium. A CALPHAD model phase diagram of T₂ in contact with SiC shows the predicted formation of MoB, Mo₂BC, and Mo₅Si₃C phases that were not seen. The discrepancy between the model prediction and the observed equilibria was due to the T₂ phase being treated as a line compound, when it really contains a homogeneity range. When accounting for the T₂ compositional variance, the model matched the experimental results. This was further confirmed by annealing a Mo-Si-B-C alloy at 1700 °C for 150 h, which showed a microstructure of T₂, SiC, Mo₅Si₃C, and MoB phases that matched the predicted phase equilibria in the improved thermodynamic model.

为了评价Mo5SiB2 （T2）与SiC在1700℃下接触150 h的扩散偶实验，通过高分辨率扫描透射电子显微镜（STEM）观察了退火后的键合界面。结果表明，T2和SiC处于热力学平衡状态，没有形成其他化合物，两相之间的相互扩散极小。T2与SiC接触时的CALPHAD模型相图显示了未见的MoB、Mo2BC和Mo5Si3C相的预测形成。模型预测与观测平衡之间的差异是由于T2相被视为线状化合物，而实际上它包含一个均匀性范围。考虑T2成分方差后，模型与实验结果吻合。在1700℃下退火150 h， Mo-Si-B-C合金的T2、SiC、Mo5Si3C和MoB相的微观结构与改进的热力学模型中预测的相平衡相匹配。

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引用次数: 0

Synthesis of CuTi intermetallic compound by mechanical alloying route 机械合金化法合成CuTi金属间化合物

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-05 DOI: 10.1016/j.intermet.2025.109117

Edara Abhay Choudhury , Nityananda Sahoo , Arka Ghosh , Parth Patel , Pankaj Shivastava , Syed Nasimul Alam , Rajan Kumar , Debasish Sahu , Nikhil Bogoju , Abhishek Kumar , Velaphi Msomi , Deepankar Panda

A solid phase consisting of two or more metallic or semimetallic elements with well-defined stoichiometry and an ordered structure is called an intermetallic compound (IMC). IMCs are a diverse resource to understand the relationships between atomic structure, physical characteristics, and chemical composition. In this work, elemental powders of Cu and Ti in an equiatomic ratio were mechanically alloyed (MA) to develop the CuTi IMC. After 30 h of milling, the powder was annealed for 2 h at 1000^oC in an Ar atmosphere. In this novel method, Cu and Ti powders are milled in a 1:1 atomic ratio (Cu - 42.96 wt% Ti) for 30 h. The milled powder was then heated to 1000 °C for 2 h in an Ar atmosphere. Analytical methods such as high-resolution transmission electron microscopy (HRTEM), x-ray diffraction (XRD), electron dispersion x-ray spectroscopy (EDXS), scanning electron microscopy (SEM), differential scanning calorimetry, and thermogravimetric analysis (DSC/TGA) were used to verify the synthesis of CuTi. This method effectively produced nanocrystalline CuTi. This study shows that the CuTi IMC may be synthesized from the binary Cu₅₀Ti₅₀ by MA.

由两种或两种以上金属或半金属元素组成的具有明确的化学计量和有序结构的固相称为金属间化合物（IMC）。IMCs是了解原子结构、物理特性和化学组成之间关系的多种资源。本文采用等原子比的Cu和Ti元素粉末进行机械合金化（MA）制备CuTi IMC。研磨30 h后，粉末在1000℃氩气中退火2 h。在这种新方法中，Cu和Ti粉末以1:1的原子比（Cu - 42.96 wt% Ti）研磨30小时。然后将研磨后的粉末在Ar气氛中加热到1000°C 2小时。采用高分辨率透射电镜（HRTEM）、x射线衍射（XRD）、电子色散x射线能谱（EDXS）、扫描电镜（SEM）、差示扫描量热法、热重分析（DSC/TGA）等分析方法验证了CuTi的合成。该方法有效地制备了纳米晶CuTi。研究表明，二元Cu50Ti50可以用MA法合成CuTi IMC。

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引用次数: 0

Embrittlement after high-temperature exposure to air of a near-γ TiAl alloy 近γ TiAl合金高温暴露于空气后的脆化

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-11 DOI: 10.1016/j.intermet.2025.109108

Frederic Habiyaremye , Camille Thenot , Pierre Sallot , Daniel Monceau , Jean-Philippe Monchoux

The loss of ductility of a Ti–48Al–2Cr–2Nb (at%) near-γ alloy after exposure to 80 % Ar–20 % O₂ at 700 °C for 1 h and 100 h has been investigated. In addition to marked decreases in ductility classically reported, increases in yield stress reaching +25 % have been observed. SIMS depth profiles enabled the determination of the ¹⁸O isotope penetration depth via volume diffusion, which reached about 10 μm after 100 h of exposure. Site-specific lift–out by FIB, along with EBSD and TEM characterizations, were employed to examine the local transformations occurring in the diffusion zone and within the volume of exposed tensile specimens. In-situ TEM straining experiments were carried out on exposed and un-exposed specimens to study the influence of exposure on the microscopic mechanisms occurring in the bulk material. Results revealed the formation of chromium-rich precipitates and a recrystallized zone extending up to a depth of 15 μm from the surface after exposure. The dislocations in the subsurface layer were non-linear, likely due interactions between dislocation lines and oxygen solutes from the exposure atmosphere which potentially contribute to strengthening of the subsurface layer and ultimately to premature failure in this region. The elevated scattering in the in-situ TEM data did not allow to correlate the dislocation jump distances to the increase in yield stress.

研究了Ti-48Al-2Cr-2Nb （at%）近γ合金在700℃下暴露于80% ar- 20% O2中1 h和100 h后的塑性损失。除了经典报道的延性显著下降外，还观察到屈服应力增加了25%。SIMS深度剖面可以通过体积扩散测定18O同位素的穿透深度，暴露100 h后达到10 μm左右。通过FIB， EBSD和TEM表征，研究了扩散区和暴露拉伸试样体积内发生的局部转变。对暴露和未暴露试样进行原位TEM应变试验，研究暴露对块状材料微观机制的影响。结果表明，暴露后形成了富铬析出物和从表面延伸至15 μm深度的再结晶区。次表层的位错是非线性的，可能是由于位错线与暴露大气中的氧溶质之间的相互作用，这可能有助于次表层的强化，并最终导致该区域的过早破坏。原位TEM数据中的高散射不能将位错跳跃距离与屈服应力的增加联系起来。

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引用次数: 0

Investigation of friction and wear performance of laser additively manufactured AlCrFeNiMo high entropy alloy coating at temperatures from RT to 900 °C 激光增材制备AlCrFeNiMo高熵合金涂层在室温~ 900℃的摩擦磨损性能研究

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-12-26 DOI: 10.1016/j.intermet.2025.109136

Cuong Nguyen , Yingang Liu , Anh Kiet Tieu , Haiwei Chang , Xuan Thang Nguyen , Guanyu Deng , Mingxing Zhang , Huijun Li , Lihong Su

In this study, AlCrFeNiMo high-entropy alloy (HEA) coatings have been successfully fabricated by laser cladding method using the mixed elemental powders as the raw material. Two different laser powers (200 W for HEA1 and 350 W for HEA2) were used, aiming to investigate the influence of processing parameters on the phase constitution, microstructure and properties of as-cladded HEA coatings. It has been found that both AlCrFeNiMo HEA coating is consisted of BCC1, BCC2 and Mo-rich phases. HEA2 exhibited finer microstructure, reduced elemental segregation, and slightly higher hardness (833.3 HV) compared to HEA1 (808.6 HV). Tribological testing from room temperature to 900 °C showed that HEA2 consistently achieved lower friction coefficients and wear rates with lowest values of 0.29 and 0.68 × 10⁻⁵ mm³/Nm at 900 °C, respectively. Cross-sectional and surface analyses revealed a transition from abrasive wear at room temperature to oxidative wear at 900 °C, with HEA2 forming a denser, stable tribo-oxide layer enriched in Al and Cr. These results highlight that optimizing laser processing enhances the microstructural integrity and high-temperature wear resistance of AlCrFeNiMo HEA coatings, making them promising for extreme service conditions.

本研究以混合元素粉末为原料，采用激光熔覆法制备了AlCrFeNiMo高熵合金（HEA）涂层。采用两种不同的激光功率（HEA1为200 W， HEA2为350 W），研究了工艺参数对包覆HEA涂层的相组成、显微组织和性能的影响。结果表明，AlCrFeNiMo HEA涂层均由BCC1、BCC2和富mo相组成。与HEA1 （808.6 HV）相比，HEA2的显微组织更细，元素偏析减少，硬度（833.3 HV）略高。从室温到900°C的摩擦学测试表明，HEA2在900°C时始终保持较低的摩擦系数和磨损率，最低值分别为0.29和0.68 × 10−5 mm3/Nm。截面和表面分析显示，HEA涂层从室温下的磨粒磨损转变为900℃下的氧化磨损，HEA2形成了更致密、更稳定的富含Al和Cr的摩擦氧化层。这些结果表明，优化激光加工可以提高AlCrFeNiMo HEA涂层的显微组织完整性和高温耐磨性，使其在极端使用条件下具有前景。

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引用次数: 0

Unraveling the mechanism underlying hydrogen storage improvement in TiZrNbCrFe high-entropy alloy via (Ti,Nb)/(Cr,Fe) stoichiometric ratio control 通过控制(Ti,Nb)/(Cr,Fe)化学计量比揭示TiZrNbCrFe高熵合金储氢性能改善机理

IF 4.8 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2026-02-01 Epub Date: 2025-11-26 DOI: 10.1016/j.intermet.2025.109053

Sibo Wang , Hongkui Zhang , Zhen Wen , Yue Li , Tong Zhang , Yingdong Qu , Guanglong Li

TiZrNbCrFe is mainly composed of C14 Laves phase and has good kinetic performance. However, due to the low content of BCC phase, the maximum hydrogen storage capacity of this alloy is relatively low. To address the issue of low maximum hydrogen storage capacity of alloys, in this paper, high-entropy alloys (TiNb)_20+xZr₂₀(FeCr)_20-x (x = 0,5,10,15) were prepared by adjusting the ratio of type a elements (Ti, Nb) to type b elements (Cr, Fe). The results show that the proportion of BCC phase increases from 21.34 % to 92.52 % by adding Ti and Nb elements. The active hydrogen absorption and peak hydrogen storage capacity of the alloy are the best when the proportion of BCC phase is 86.92 %, that is, Ti₃₀Nb₃₀Zr₂₀Fe₁₀Cr₁₀ alloy. The first activation hydrogen absorption capacity of this alloy is as high as 1.88 wt %, which is 1.29 wt % higher than that of TiZrNbCrFe alloy. When the hydrogen pressure is 3 MPa and the temperature is 100 °C, the saturated hydrogen absorption is 2.04 wt %, which is 0.9 wt % higher than that of TiZrNbCrFe alloy. With the increase of Ti and Nb content, the dehydrogenation temperature increases from 218 °C to 419 °C, the stability of the hydride increases, and the difficulty of dehydrogenation increases. This paper provides a design idea for the composition control of high-entropy hydrogen storage materials.

TiZrNbCrFe主要由C14 Laves相组成，具有良好的动力学性能。然而，由于BCC相含量低，该合金的最大储氢容量相对较低。为解决合金最大储氢容量低的问题，本文通过调整a型元素（Ti, Nb）与b型元素（Cr, Fe）的比例，制备了高熵合金（TiNb）20+xZr20(FeCr)20-x （x = 0,5,10,15）。结果表明：加入Ti和Nb元素后，BCC相的比例由21.34%提高到92.52%；当BCC相含量为86.92%时，合金的活性吸氢量和峰值储氢容量最佳，即Ti30Nb30Zr20Fe10Cr10合金。该合金的第一次活化吸氢量高达1.88 wt %，比TiZrNbCrFe合金高1.29 wt %。当氢压力为3 MPa，温度为100℃时，饱和氢吸收率为2.04 wt %，比TiZrNbCrFe合金高0.9 wt %。随着Ti和Nb含量的增加，脱氢温度从218℃升高到419℃，氢化物的稳定性提高，脱氢难度增大。本文为高熵储氢材料的成分控制提供了一种设计思路。

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