Intermetallics最新文献_第5页

Effect of Cr on nano-indentation Young's modulus and hardness of the β-Ti phase in equilibrium with α2-Ti3Al and γ-TiAl phases in Ti-Al-Cr alloys 铬对 Ti-Al-Cr 合金中与α2-Ti3Al 和 γ-TiAl 相平衡的 β-Ti 相的纳米压痕杨氏模量和硬度的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-21 DOI: 10.1016/j.intermet.2024.108543

Yotaro Okada, Sota Taniguchi , Ryosuke Yamagata , Hirotoyo Nakashima , Satoru Kobayashi, Masao Takeyama

Young's modulus and hardness of the constituent phases of β-Ti (bcc or B2), in equilibrium with α₂-Ti₃Al (D0₁₉) and γ-TiAl (L1₀) phases in Ti-Al-Cr ternary alloys were quantitatively evaluated in terms of the chemical composition analysis and nano-indentation method, in order to identify the Cr concentration dependence on the mechanical properties of the β phase. An alloy with a nominal composition of Ti-43Al-3Cr (at.%) decomposes into the three phases of β, α₂, and γ by equilibrium heat treatment at 1373 K, with chemical composition of Ti-37.2Al-5.2Cr, Ti-38.9Al-2.2Cr, and Ti-47.4Al-1.4Cr, respectively. The β phase shows a Young's modulus of 141 ± 5 GPa, smaller and less orientation dependent than the other two phases of α₂ (174 ± 9 GPa) and γ phases (164 ± 15 GPa). In contrast, the β phase has a hardness of 5.9 ± 0.3 GPa, slightly softer than the α₂ phase (6.4 ± 0.8 GPa) but much harder than the γ phase (3.7 ± 0.6 GPa). The alloys Ti-44Al-4Cr and Ti-45Al-6Cr consist of two phases of β and γ phases, and the chemical composition of the β phase in these two alloys is Ti-36.5 Al-8.5 Cr and Ti-36.3 Al-13.9 Cr, respectively, with nearly the same Al concentration. The Young's modulus and hardness of the β phase with the latter composition become 158 GPa and 6.7 GPa, respectively, with increasing Cr content. These results found that the effect of solid solution Cr on the Young's modulus for β phase is relatively weak, and that on the hardness is strong, in comparison with that for the other two phases.

通过化学成分分析和纳米压痕法，定量评估了 Ti-Al-Cr 三元合金中与α2-Ti3Al（D019）和γ-TiAl（L10）相平衡的β-Ti（bcc 或 B2）组成相的杨氏模量和硬度，以确定铬浓度对β相机械性能的依赖性。一种标称成分为 Ti-43Al-3Cr (at.%) 的合金在 1373 K 下通过平衡热处理分解为 β、α2 和 γ 三相，其化学成分分别为 Ti-37.2Al-5.2Cr、Ti-38.9Al-2.2Cr 和 Ti-47.4Al-1.4Cr。β 相的杨氏模量为 141 ± 5 GPa，与其他两相 α2 相（174 ± 9 GPa）和 γ 相（164 ± 15 GPa）相比，杨氏模量更小，取向依赖性更低。相比之下，β 相的硬度为 5.9 ± 0.3 GPa，比 α2 相（6.4 ± 0.8 GPa）稍软，但比γ 相（3.7 ± 0.6 GPa）硬得多。合金 Ti-44Al-4Cr 和 Ti-45Al-6Cr 由 β 和 γ 两相组成，这两种合金中 β 相的化学成分分别为 Ti-36.5 Al-8.5 Cr 和 Ti-36.3 Al-13.9 Cr，铝的浓度几乎相同。随着铬含量的增加，后一种成分的 β 相的杨氏模量和硬度分别变为 158 GPa 和 6.7 GPa。这些结果表明，与其他两种相相比，固溶铬对β相杨氏模量的影响相对较弱，而对硬度的影响较强。

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引用次数: 0

Improving strength-ductility balance of a brittle Al-doped FeCrNi multi-principal element alloy by introducing a heterostructure with hard phase enveloping soft phase 通过引入硬相包软相的异质结构改善脆性铝掺杂铁铬镍多主元合金的强度-电导率平衡

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-21 DOI: 10.1016/j.intermet.2024.108542

Yating Lin , Jinrong Wang , Lihao Hu , Lu Zhang , Rui Zhang , Jianxin Yu , Baolin Wu

In the present work, a heterostructure was created in a brittle Al-doped FeCrNi multi-principal element alloy via thermomechanical treatment. This heterostructure consists of a hard phase surrounding a soft phase, with the soft defect-free face-centered cubic (FCC) phase formed through phase transformation evenly distributed within the hard body-centered cubic (BCC) matrix. This unique heterostructure promotes more uniform deformation, thereby enhancing the deformability of the original hard BCC matrix. As a result, the elongation was increased from 2.4 % to 17 %, while the ultimate tensile strength was just decreased from 1076 MPa to 1021 MPa. The maintenance of strength is primarily attributed to the hetero-deformation-induced (HDI) strengthening effect provided by this distinctive heterostructure. Overall, this special heterostructure formed through phase transformation opens up new possibilities for developing alloys with both high strength and ductility.

在本研究中，通过热机械处理在脆性铝掺杂铁铬镍多主元素合金中创建了一种异质结构。这种异质结构由硬相包围软相组成，通过相变形成的无缺陷面心立方（FCC）软相均匀分布在硬质体心立方（BCC）基体中。这种独特的异质结构可促进更均匀的变形，从而增强原始硬质 BCC 基体的可变形性。因此，伸长率从 2.4% 提高到 17%，而极限拉伸强度仅从 1076 兆帕降低到 1021 兆帕。强度的保持主要归功于这种独特的异质结构所提供的异质变形诱导（HDI）强化效应。总之，这种通过相变形成的特殊异质结构为开发具有高强度和延展性的合金提供了新的可能性。

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引用次数: 0

Laser welding of dissimilar TiAl/Ti6-Al-4V materials: Effects of rapid in-situ laser pre-heating on microstructure and mechanical properties of the welding joint 异种 TiAl/Ti6-Al-4V 材料的激光焊接：快速原位激光预热对焊点微观结构和机械性能的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108514

Qiyuan Yu , Yu Zhang , Ziyuan Jia , Lujun Huang , Lin Geng , Liqun Li

TiAl alloy has broad application prospects in the aerospace field. In practical working environments, connecting with other materials is considered an important means of fully utilizing their excellent properties. This study employed a laser in-situ pre-scanning method to preheat the weld seam, achieving the connection between TiAl alloy and Ti-6Al-4V. On this basis, the microstructural evolution of the fusion zone (FZ), fusion line (FL), and heat-affected zone (HAZ) of the welded joint was analyzed in detail. By comparing with traditional welding processes, the effects of laser in-situ preheating on the microstructure and properties of the welded joints were studied. The results showed that the FZ area consists of α₂ and martensitic α-Ti, while the FL on the TiAl side features a transition layer of β/B2 phases, providing plasticity and toughness to the welded joint. The in-situ scanning method reduced the cracks generated during welding, resulting in a more uniform distribution of the transition layer. The obtained FZ exhibited higher microhardness. The room temperature tensile strength of the welded joint reached 650 MPa. As the temperature increased, at 400 °C, the tensile strength and elongation reached 571 MPa and 3 %, respectively, significantly higher than the 450 MPa and 1.5 % achieved by conventional welding at the same temperature. When the temperature further increased to 500 °C and 600 °C, Ti-6Al-4V experienced significant softening, becoming the weak point of the welded joint.

TiAl 合金在航空航天领域有着广阔的应用前景。在实际工作环境中，与其他材料连接被认为是充分发挥其优异性能的重要手段。本研究采用激光原位预扫描方法预热焊缝，实现了 TiAl 合金与 Ti-6Al-4V 的连接。在此基础上，详细分析了焊点熔合区（FZ）、熔合线（FL）和热影响区（HAZ）的微观结构演变。通过与传统焊接工艺的比较，研究了激光原位预热对焊接接头微观结构和性能的影响。结果表明，FZ 区域由 α2 和马氏体 α-Ti 组成，而 TiAl 侧的 FL 则具有 β/B2 相过渡层，为焊接接头提供了塑性和韧性。原位扫描方法减少了焊接过程中产生的裂纹，使过渡层的分布更加均匀。获得的 FZ 具有更高的显微硬度。焊接接头的室温抗拉强度达到 650 兆帕。随着温度的升高，在 400 °C 时，抗拉强度和伸长率分别达到 571 兆帕和 3%，明显高于传统焊接在相同温度下达到的 450 兆帕和 1.5%。当温度进一步升高到 500 ℃ 和 600 ℃ 时，Ti-6Al-4V 出现明显软化，成为焊接接头的薄弱点。

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引用次数: 0

Quaternary low melting point Sn-Bi-in-xGa solder with improved mechanical performance for advanced electronic packaging 用于先进电子封装的具有更佳机械性能的四元低熔点锡-铋-钆焊料

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108534

Jingyu Qiao , Xingchao Mao , Lulin Xie , Shichen Xie , King-Ning Tu , Yingxia Liu

Managing thermal stress is important for ensuring the yield of chip integration and packaging. The development of appropriate low melting point solders has become the key to mitigating thermal stress during the assembling, which aligns well with the demands of next-generation interconnection technologies. In this study, we developed a quaternary low melting point solder based on Sn-Bi-In-xGa (x = 0, 0.1, 0.3, 0.5, 1.0, 1.5, wt%). The addition of Ga not only lowers the solder's melting point but also enhances its wettability. We also studied how the increase of Ga in the solder alloy influences the microstructure and shear test failure mechanism during aging. Upon subjecting solder joints to a 10-min reflow process at 100 °C with Cu substrates, two distinct types of intermetallic compound (IMC) were observed: Cu₆(Sn, In)₅ when Ga content was ≤0.1 wt% and γ₃-Cu₉Ga₄ when Ga content was ≥0.3 wt%. The stable property of γ₃-Cu₉Ga₄ IMC ensures the mechanical stability of the joints during aging. Therefore, the addition of an appropriate amount of Ga (0.3 wt%) can improve the mechanical performance of solder joints during aging. These findings offer valuable insights for the development of high-performance low-melting-point solders in microelectronics, shedding light on the mechanisms underlying the influence of Ga content on solder microstructures and mechanical reliability during thermal aging.

管理热应力对于确保芯片集成和封装的产量非常重要。开发适当的低熔点焊料已成为在组装过程中减轻热应力的关键，这与下一代互连技术的要求十分吻合。在这项研究中，我们开发了一种基于 Sn-Bi-In-xGa（x = 0、0.1、0.3、0.5、1.0、1.5 wt%）的四元低熔点焊料。镓的加入不仅降低了焊料的熔点，还增强了其润湿性。我们还研究了镓在焊料合金中的增加如何影响老化过程中的微观结构和剪切测试失效机制。以铜为基底的焊点在 100 °C 下进行 10 分钟回流焊后，观察到两种不同类型的金属间化合物 (IMC)：当 Ga 含量≤0.1 wt% 时为 Cu6(Sn,In)5，当 Ga 含量≥0.3 wt% 时为 γ3-Cu9Ga4。γ3-Cu9Ga4 IMC 的稳定特性确保了接头在老化过程中的机械稳定性。因此，添加适量的 Ga（0.3 wt%）可以改善老化过程中焊点的机械性能。这些发现为微电子领域高性能低熔点焊料的开发提供了宝贵的见解，阐明了镓含量对热老化过程中焊料微结构和机械可靠性的影响机制。

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引用次数: 0

Design of novel structural eutectic high entropy alloys (EHEAs) containing high-temperature resistant alloying elements 设计含有耐高温合金元素的新型结构共晶高熵合金 (EHEAs)

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108535

Yang Gao , Yangchuan Cai , Yan Cui , Yanan Yan , Kai Wang

This article employs the “Simple Mixing Enthalpy Method” to add high-temperature alloying elements Mo/V and Nb to the Fe-Co-Cr-Ni-based alloy system, and utilizes a model of the relationship between elements and phase structures. Finally, EHEAs are successfully designed with the help of phase diagrams, namely FeCoNi2.0Cr1.2Mo0.2Nb0.63 (Mo_0.2Nb_0.63) and FeCoNi2.0Cr1.2V0.2Nb0.68 (V_0.2Nb_0.68). In EHEAs, a typical fully eutectic microstructure is observed, consisting of alternating FCC (face-centered cubic) and HCP (hexagonal close-packed) phases. Evaluation of mechanical performance indicators reveals that nano-hardness and elastic modulus increase from the FCC phase to the HCP phase, while the hardness and elastic modulus of the eutectic phase originate from modulation of these two phases. Meanwhile, the microhardness of both alloy systems increases linearly with increasing Nb content. In addition, EHEAs exhibit high strength and ductility but with differences attributed to the significant influence of Mo and V elements on eutectic phase spacing and phase size. Different phase interface types and strain gradients during deformation affect the mechanical properties. This study tests the high-temperature compression performance and fracture morphology of novel high-entropy alloys, paving the way for subsequent research on high-temperature performance.

本文采用 "简单混合焓法 "在铁-铜-铬-镍基合金体系中添加高温合金元素 Mo/V 和 Nb，并利用元素与相结构之间的关系模型。最后，在相图的帮助下成功设计出 EHEAs，即 FeCoNi2.0Cr1.2Mo0.2Nb0.63 (Mo0.2Nb0.63) 和 FeCoNi2.0Cr1.2V0.2Nb0.68 (V0.2Nb0.68)。在 EHEAs 中，观察到典型的全共晶微观结构，由交替的 FCC（面心立方）和 HCP（六方紧密堆积）相组成。对力学性能指标的评估显示，纳米硬度和弹性模量从 FCC 相增加到 HCP 相，而共晶相的硬度和弹性模量则源自这两种相的调制。同时，这两种合金体系的显微硬度随着铌含量的增加而线性增加。此外，EHEAs 还表现出较高的强度和延展性，但由于 Mo 和 V 元素对共晶相间距和相尺寸的显著影响，两者之间存在差异。不同的相界面类型和变形过程中的应变梯度会影响机械性能。本研究测试了新型高熵合金的高温压缩性能和断裂形态，为后续的高温性能研究铺平了道路。

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引用次数: 0

Enhanced mechanical and wear properties of novel AlMgB14 intermetallic reinforced aluminum matrix nanocomposite 增强新型 AlMgB14 金属间增强铝基纳米复合材料的机械性能和耐磨性能

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108524

Elham Bakhshizade , Mehdi Khodaei , Ashkan Zolriasatein , Ali Shokuhfar

Aluminum matrix composites are the most promising materials in various industries, such as automobiles and aerospace. However, their usage may be limited due to their low strength and low wear resistance in some functional applications. In this study, a novel aluminum matrix nanocomposite with desirable strength and tribological properties was synthesized by mechanical milling and hot-pressing. AlMgB₁₄ (called BAM) intermetallic with an average particle size of 32 nm was employed as the reinforcement (with different amounts of 0, 1, 3, and 5 wt%) in the aluminum matrix for the first time, aiming to improve the strength and wear resistance. The specimens were characterized by X-ray diffractometer (XRD), field-emission scanning electron microscope (FESEM), energy dispersive spectrum (EDS), hardness, compressive strength, and dry sliding testing. The results demonstrated that by increasing the BAM percentage, a significant enhancement in the mechanical properties and wear resistance of the aluminum matrix is achieved. The nanocomposite sample, which contains 5 wt% BAM nanoparticles exhibited a remarkable enhancement in microhardness (a 124 % improvement), yield strength (a 168 % increase), and ultimate strength (a 149 % increase) compared to the unreinforced aluminum sample. Furthermore, this sample demonstrated the best wear performance, with a 65 % reduction in coefficient of friction and an 82 % reduction in wear rate. The advancement in wear assessment can be attributed to the development of a mechanically milled layer (MML) on the surface subjected to wear. The findings highlight the suitability of the BAM intermetallic compound for enhancing the comprehensive properties of composites, particularly aluminum matrix composites.

铝基复合材料是汽车和航空航天等各行各业最有前途的材料。然而，在某些功能性应用中，铝基复合材料的低强度和低耐磨性可能会限制其使用。本研究通过机械研磨和热压合成了一种具有理想强度和摩擦学性能的新型铝基纳米复合材料。首次在铝基体中使用了平均粒径为 32 nm 的 AlMgB14（称为 BAM）金属间化合物作为增强剂（含量分别为 0、1、3 和 5 wt%），旨在提高强度和耐磨性。通过 X 射线衍射仪 (XRD)、场发射扫描电子显微镜 (FESEM)、能量色散谱 (EDS)、硬度、抗压强度和干滑动测试对试样进行了表征。结果表明，通过增加 BAM 的比例，铝基体的机械性能和耐磨性得到了显著提高。与未增强的铝样品相比，含有 5 wt% BAM 纳米颗粒的纳米复合材料样品在显微硬度（提高了 124%）、屈服强度（提高了 168%）和极限强度（提高了 149%）方面都有显著提高。此外，该样品的磨损性能最佳，摩擦系数降低了 65%，磨损率降低了 82%。磨损评估的进步可归因于受磨损表面形成了机械研磨层（MML）。研究结果突出表明，BAM 金属间化合物适用于增强复合材料，尤其是铝基复合材料的综合性能。

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引用次数: 0

Effect of Co distribution on the oxidation behavior of aluminide coatings in Mo-rich Ni-based single-crystal superalloy Co 分布对富钼镍基单晶超级合金中铝化物涂层氧化行为的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-18 DOI: 10.1016/j.intermet.2024.108531

X.Y. Chen , Y. Liu , H. Zhang , S.K. Gong , Y.L. Pei , S.S. Li

Three Co-modified coatings with different Co content distribution were prepared by electroless plating and vapor phase aluminizing (VPA) technique on Mo-rich Ni-based single-crystal superalloy. These coatings were subsequently subjected to prolonged static oxidation tests at 1000 °C for a duration of 500 h to reveal their oxidation behavior. The findings of this study indicated that the incorporation of Co within the coatings impeded the diffusion of Al and Mo within the infiltration layer and results in a slight decrease in the oxidation resistance of the coatings during the oxidation at 1000 °C. Additionally, Co accelerated the θ-to-α Al₂O₃ phase transformation at the initial oxidation stage. A comprehensive analysis was conducted to elucidate the oxidation kinetics and the underlying mechanisms associated with the diffusion behavior of the aluminide coatings in the presence of varying Co concentrations.

通过无电解电镀和气相镀铝（VPA）技术，在富钼镍基单晶超级合金上制备了三种不同钴含量分布的钴改性涂层。随后在 1000 °C 下对这些涂层进行了长达 500 小时的静态氧化试验，以揭示其氧化行为。研究结果表明，在涂层中加入 Co 会阻碍铝和钼在渗透层中的扩散，从而导致涂层在 1000 °C 氧化过程中的抗氧化性略有下降。此外，在氧化初期，Co 还加速了 θ 到 α Al2O3 的相变。为了阐明氧化动力学以及与不同 Co 浓度下铝涂层扩散行为相关的基本机制，我们进行了一项综合分析。

引用次数: 0

Microstructure and mechanical properties of electron beam welding of AlCoCrFeNi2.1 eutectic high entropy alloy 电子束焊接 AlCoCrFeNi2.1 共晶高熵合金的显微组织和机械性能

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108530

Shuai Li , Xiaotong Hou , Xin Liu , Zhongying Liu , Xingxing Wang , Tingting Wu , Yanchao Bai , Wei Zhao

The dual-phase interleaved lamellar structure of the AlCoCrFeNi_2.1 eutectic high entropy alloy (EHEA) endows it with high strength, excellent plasticity and radiation resistance, thereby offering considerable potential as a structural material. Electron beam welding (EBW) is employed to fabricate homogenous welded joints of the heat-treated AlCoCrFeNi_2.1 EHEA. The experimental results indicate that the rapid cooling rate associated with EBW inhibits the diffusion of metal atoms and enhances the nucleation rate, thereby promoting the formation of a finer microstructure in the fusion zone (FZ). This markedly improves the mechanical properties of the welded joints, with the ultimate tensile strength of the welded joints exceeding that of the base material (BM). At a welding heat input of 123.5 J/mm, the ultimate tensile strength of the joint reaches a maximum of 990.3 MPa, resulting in a peak joint efficiency of 106.1 %. In comparison to the BM, the microhardness of the heat-affected zone (HAZ) exhibits a decrease of between 9.4 % and 11.4 %, while the microhardness of the FZ demonstrates an increase of between 10.0 % and 13.0 %. This study demonstrates the feasibility of employing EBW for the AlCoCrFeNi_2.1 EHEA, providing valuable insights for advancing its practical applications.

AlCoCrFeNi2.1 共晶高熵合金（EHEA）的双相交错薄片结构使其具有高强度、优异的塑性和抗辐射性，因此作为一种结构材料具有相当大的潜力。电子束焊接（EBW）被用于制造热处理的 AlCoCrFeNi2.1 EHEA 的均匀焊接接头。实验结果表明，与 EBW 相关的快速冷却速率抑制了金属原子的扩散并提高了成核率，从而促进了熔合区（FZ）中更精细微观结构的形成。这明显改善了焊接接头的机械性能，焊接接头的极限抗拉强度超过了母材（BM）。在焊接热输入为 123.5 焦耳/毫米时，焊点的极限抗拉强度达到最大值 990.3 兆帕，焊点效率达到峰值 106.1%。与 BM 相比，热影响区 (HAZ) 的显微硬度下降了 9.4 % 到 11.4 %，而 FZ 的显微硬度则增加了 10.0 % 到 13.0 %。这项研究证明了在 AlCoCrFeNi2.1 EHEA 中使用 EBW 的可行性，为推动其实际应用提供了宝贵的见解。

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引用次数: 0

Microstructure, mechanical and oxygen-deficient lead-bismuth eutectic corrosion properties of FeCrAlTiMo high-entropy alloy coatings for fuel claddings 用于燃料包层的 FeCrAlTiMo 高熵合金涂层的显微结构、机械性能和缺氧铅铋共晶腐蚀性能

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108533

Jian Yang , Feifei Zhang , Lihong Zhai , Guofeng Qu , Jijun Yang

The FeCrAlTiMo high-entropy alloy (HEA) coatings were deposited on the ferritic/martensitic (F/M) steel fuel cladding tubes by magnetron sputtering technology to improve their lead-bismuth eutectic (LBE) corrosion resistance. The effects of bias voltage on the microstructure, mechanical and LBE corrosion properties of the FeCrAlTiMo coatings were systematically investigated. The LBE corrosion test shows that the coatings with a bias voltage of −150 V exhibit the best oxidation resistance after exposed to the oxygen-deficient LBE at 600 °C for 500 h, and can be used as a protective candidate coating material for lead-cooled fast reactor (LFR) application. The high-temperature LBE corrosion mechanism of the FeCrAlTiMo coatings under deficient oxygen concentration was also discussed in detail.

采用磁控溅射技术在铁素体/马氏体（F/M）钢燃料包壳管上沉积了铁铬铝钛钼高熵合金（HEA）涂层，以提高其铅铋共晶（LBE）耐腐蚀性。系统研究了偏压对 FeCrAlTiMo 涂层的微观结构、机械性能和 LBE 腐蚀性能的影响。LBE 腐蚀试验表明，偏置电压为 -150 V 的涂层在 600 °C 的缺氧 LBE 下暴露 500 小时后表现出最佳的抗氧化性，可用作铅冷快堆 (LFR) 应用的保护性候选涂层材料。此外，还详细讨论了缺氧条件下铁铬铝钛钼涂层的高温 LBE 腐蚀机理。

引用次数: 0

Effects of Ta/Nb/Ti addition on the microstructure and mechanical properties of novel CoNi-based superalloys fabricated by directed energy deposition 添加 Ta/Nb/Ti 对通过定向能沉积法制造的新型 CoNi 基超合金微观结构和力学性能的影响

IF 4.3 2区材料科学 Q2 CHEMISTRY, PHYSICAL

Intermetallics

Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108527

Weiming Huang , Lilin Wang , Haozhi Chai , Xin Lin

The influence of alloying on the microstructure, particularly the phase precipitation behavior and the volume fraction of the γʹ phase, is critical for the development of precipitation-strengthed cobalt-based superalloys. In the context of additive manufacturing, it is also essential to consider how alloying elements affect the formability of these alloys. In this study, three developed CoNi-based superalloys, named as AlTa, AlTaNb and AlTaTi, were fabricated using laser directed energy deposition, and followed by homogenization and aging treatment. The effect of alloy composition on additive manufacturing formability, microstructure and mechanical properties was analyzed. The AlTa and AlTaNb specimens show good additive manufacturing formability, but the AlTaTi specimen appears several long cracks along deposition direction. The addition of Ti is not conducive to the additive manufacturing formability of CoNi-based superalloys. The volume fraction of the γ′ phase in the three heat-treated specimens is 65∼70 %, and the average size is about 200 nm. The AlTa specimen maintains its tensile strength without softening from room temperature to 900 °C, possessing an excellent yield strength of 471 MPa at 900 °C. The AlTaNb and AlTaTi specimens achieves higher tensile strength at room temperature due to the strengthening effect of Nb and Ti elements, but underwent premature intergranular fracture during high-temperature tensile testing due to the insufficient grain boundary strength. Futher grain boundary strengthening should be considered for them.

合金化对微观结构的影响，尤其是相析出行为和γʹ相的体积分数，对于沉淀强化钴基超合金的开发至关重要。在快速成型制造的背景下，考虑合金元素如何影响这些合金的成型性也是至关重要的。在本研究中，使用激光定向能沉积法制造了三种已开发的钴镍基超级合金，分别命名为 AlTa、AlTaNb 和 AlTaTi，然后进行了均匀化和时效处理。分析了合金成分对增材制造成型性、微观结构和机械性能的影响。AlTa 和 AlTaNb 试样显示出良好的快速成型性，但 AlTaTi 试样沿沉积方向出现了几条长裂纹。添加 Ti 不利于 CoNi 基超合金的快速成型性。在三个热处理试样中，γ′相的体积分数为 65∼70%，平均尺寸约为 200 nm。AlTa 试样从室温到 900 ℃ 都能保持抗拉强度而不软化，在 900 ℃ 时屈服强度高达 471 兆帕。由于 Nb 和 Ti 元素的强化作用，AlTaNb 和 AlTaTi 试样在室温下获得了更高的抗拉强度，但由于晶界强度不足，在高温拉伸测试中过早出现晶间断裂。应考虑对它们进行进一步的晶界强化。

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引用次数: 0