Journal of Materials Research and Technology-Jmr&t最新文献

英文中文

Investigation of mechanical properties of NixCoyCrz thin film through combinatorial analysis 用组合分析法研究NixCoyCrz薄膜的力学性能

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-11-30 DOI: 10.1016/j.jmrt.2025.11.250

Semin Park , Geummi Lee , Daeho Kim, Seung Min Han

NiCoCr, a medium entropy alloy with high strength and excellent ductility at low temperatures, has increased interest for extreme environment applications, but its relatively poor room-temperature yield strength has driven studies to enhance its mechanical properties through non-equiatomic compositions. Ni_xCo_yCr_z was prepared using co-sputtering from Ni, Co, and Cr targets that allowed for the synthesis of a thin film with a wide compositional range in which each element varied between 17 and 57 at. %. The coating consisted of single-phase face-centered cubic and multiphase regions containing hexagonal close-packed and sigma phases. Nanoindentation analysis was performed as an effective high-throughput method for determining the effect of the composition on the mechanical properties of Ni_xCo_yCr_z alloy, and elastic modulus and hardness mapping was acquired. Notably, Ni₂₀Co₄₀Cr₄₀ exhibited the highest hardness of 7.45 GPa within the single-phase region, primarily attributed to enhanced non-linear Co–Cr interactions that impede dislocation motion. This work successfully proposed, via a high-throughput method, the composition with the highest strength and captured the trend in strength relative to the bulk values.

NiCoCr是一种中熵合金，具有高强度和优异的低温延展性，在极端环境中应用的兴趣越来越大，但其相对较差的室温屈服强度促使研究人员通过非等原子成分来提高其机械性能。NixCoyCrz是用Ni， Co和Cr靶材共溅射制备的，这使得合成的薄膜具有广泛的组成范围，其中每个元素在17和57之间变化。%。该涂层由单相面心立方和多相区域组成，多相区域包含六边形密排相和西格玛相。纳米压痕分析是测定成分对NixCoyCrz合金力学性能影响的一种有效的高通量方法，并获得了弹性模量和硬度图。值得注意的是，Ni20Co40Cr40在单相区表现出最高的硬度，达到7.45 GPa，这主要是由于Co-Cr的非线性相互作用增强，阻碍了位错的运动。这项工作通过高通量方法成功地提出了具有最高强度的组合物，并捕获了相对于体积值的强度趋势。

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引用次数: 0

Parameter study and multi-objective optimization for water jet guided laser drilling of SiC/SiC ceramic matrix composites 水射流引导激光打孔SiC/SiC陶瓷基复合材料参数研究及多目标优化

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.jmrt.2025.12.063

Jiayong Wei , Mengxuan Gao , Yanzhe Fu , Zichen Zhang , Hanling Wu , Wei Zhang , Liang Wang , Songmei Yuan

Silicon carbide fiber-reinforced silicon carbide ceramic matrix composites (SiC-CMCs) are promising aerospace materials, yet their inherent heterogeneity and anisotropy pose formidable challenges for high-precision, low-damage hole drilling. Water jet guided laser (WJGL) processing offers a viable solution, though it remains susceptible to edge chipping. This study develops a novel quantitative edge chipping evaluation methodology by integrating conventional one- and two-dimensional edge chipping factors (ECFs), enabling comprehensive damage characterization. Through systematic experimentation and multi-objective optimization, we analyze the coupled effects of laser power, scanning speed, and water jet pressure on edge chipping, dimensional accuracy, and processing efficiency. Scanning speed emerges as the dominant parameter, contributing 52.40 % to processing efficiency while significantly influencing chipping. Laser power and scanning speed primarily affect entrance chipping, whereas exit chipping is more sensitive to elevated scanning speed and water pressure. Optimization yields substantial improvements: entrance/exit chipping factors decrease by 33 % and 11 %, respectively; while entrance/exit dimensional accuracies improve by 34 % and 68 %, respectively, and processing efficiency increases by 58 % (achieving 3.794 s per hole). This study provides an effective technical solution for high-quality, efficient, and low-damage hole-making of SiC-CMCs.

碳化硅纤维增强碳化硅陶瓷基复合材料（sic - cmc）是一种很有前途的航空航天材料，但其固有的非均质性和各向异性给高精度、低损伤钻孔带来了巨大挑战。水射流制导激光（WJGL）加工提供了一个可行的解决方案，尽管它仍然容易受到边缘切屑的影响。本研究通过整合传统的一维和二维边缘剥落因子（ECFs），开发了一种新的边缘剥落定量评估方法，实现了全面的损伤表征。通过系统实验和多目标优化，分析了激光功率、扫描速度和水射流压力对边缘切屑、尺寸精度和加工效率的耦合影响。扫描速度成为主导参数，对处理效率的贡献率为52.40%，对芯片的影响显著。激光功率和扫描速度主要影响入口切屑，而提高扫描速度和水压对出口切屑更为敏感。优化产生了实质性的改进：入口/出口切屑系数分别降低了33%和11%；而进出口尺寸精度分别提高了34%和68%，加工效率提高了58%（达到每孔3.794秒）。本研究为高质量、高效率、低损伤的sic - cmc制孔提供了有效的技术解决方案。

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引用次数: 0

Data-driven prediction of mechanical properties in recycled fibre-reinforced polymer composites: Integrating machine learning with material–processing feature importance analysis 再生纤维增强聚合物复合材料力学性能的数据驱动预测：将机器学习与材料加工特征重要性分析相结合

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI: 10.1016/j.jmrt.2025.12.062

Zahra Shahroodi , Alireza Tayebi , Arsham Moayedi Far , David Zidar , Klaus Straka , Florian Arbeiter , Nina Krempl , Clemens Holzer

The performance of polymer components made from recycled or reused materials is strongly influenced by material composition, processing routes, and manufacturing parameters. This study presents an integrated experimental–computational framework to optimize and predict the tensile properties of glass fibre-reinforced recycled polypropylene (GF-rPP). The material was produced using twin-screw extrusion and injection moulding. Glass fibre content, recycled polypropylene proportion (rPP), virgin polypropylene content, additive content, screw speed, extruder flow rate, and cooling conditions were systematically varied. These factors were used to establish quantitative links between thermomechanical processing and mechanical performance. A comprehensive experimental dataset was analysed using four machine learning (ML) models. The Artificial Neural Network (ANN) achieved the highest predictive accuracy (R² > 0.85) for both Young's modulus and tensile strength. Feature-importance analysis showed that glass fibre content was the most influential factor for stiffness and elongation at break. However, rPP content was the most influential factor on tensile strength. Among processing parameters, extruder flow rate had the greatest impact, while other parameters played smaller roles. This combined experimental and ML-based approach provides a powerful method for optimizing the performance of recycled composites. It enables data-driven material selection and process tuning. Overall, the methodology supports the sustainable development of high-performance polymer composites by enhancing material efficiency and product performance.

由回收或再利用材料制成的聚合物组件的性能受到材料成分、加工路线和制造参数的强烈影响。本研究提出了一个集成的实验-计算框架来优化和预测玻璃纤维增强再生聚丙烯（GF-rPP）的拉伸性能。该材料是采用双螺杆挤压和注射成型生产的。玻璃纤维含量、再生聚丙烯比（rPP）、原聚丙烯含量、添加剂含量、螺杆转速、挤出机流量和冷却条件均有系统变化。这些因素被用来建立热机械加工和机械性能之间的定量联系。使用四种机器学习（ML）模型分析了一个全面的实验数据集。人工神经网络（ANN）对杨氏模量和拉伸强度的预测精度最高（R2 > 0.85）。特征重要性分析表明，玻璃纤维含量是影响断裂刚度和断裂伸长率的主要因素。而rPP含量对拉伸强度的影响最大。在工艺参数中，挤出机流量的影响最大，其他参数的影响较小。这种结合实验和基于ml的方法为优化再生复合材料的性能提供了一种有力的方法。它支持数据驱动的材料选择和工艺调整。总体而言，该方法通过提高材料效率和产品性能来支持高性能聚合物复合材料的可持续发展。

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引用次数: 0

Structure design and mechanical properties study of 3D printed gradient scaffolds for cartilage tissue engineering 3D打印软骨组织工程梯度支架结构设计及力学性能研究

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-07 DOI: 10.1016/j.jmrt.2025.12.044

Lanbo Wang , Hewen Zhang , Yiyu Feng , Quanming Yang , Minjian Zhang , Yali Dai , Aihua Sun , Jianjun Guo , Ruqing Ye , Yuchuan Cheng

As individuals’ age, cumulative exposure to friction and compressive forces on joints causes significant wear and tear, increasing susceptibility to conditions like osteoarthritis. Traditional clinical treatments often prove inadequate in addressing extensive cartilage loss. This paper evaluates the mechanical properties and porosity of triply periodic minimal surface structures and lattice configurations, fabricated using 3D printing technology. Centered on the Gyroid topology, 16 distinct structural designs were generated by modifying dimensions, wall thicknesses, and gradient configurations. The compressive strength, compressive modulus, load-bearing capacity, permeability and shear stress were comprehensively evaluated. The results demonstrate that gradient-designed Gyroid cell unit scaffolds with dimensions of 3 mm and 4 mm achieved an optimal balance between mechanical performance and permeability. These findings suggest that these two structural designs have substantial potential for future clinical applications in cartilage repair, potentially transforming treatment approaches for joint-related degenerative diseases.

随着年龄的增长，关节的摩擦和压缩力的累积会导致严重的磨损，增加患骨关节炎等疾病的可能性。传统的临床治疗方法往往不足以解决广泛的软骨损失。本文评估了使用3D打印技术制造的三周期最小表面结构和晶格构型的力学性能和孔隙率。以Gyroid拓扑为中心，通过修改尺寸、壁厚和梯度配置，生成了16种不同的结构设计。对其抗压强度、抗压模量、承载能力、渗透性和剪应力进行了综合评价。结果表明，梯度设计的尺寸分别为3mm和4mm的Gyroid细胞单元支架在力学性能和渗透性之间取得了最佳平衡。这些发现表明，这两种结构设计在软骨修复的未来临床应用中具有巨大的潜力，可能会改变关节相关退行性疾病的治疗方法。

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引用次数: 0

Pre-aging induced concurrent enhancement of mechanical properties and softening resistance performance of Cu–Ni–Co–Si alloys 预时效诱导Cu-Ni-Co-Si合金力学性能和抗软化性能同时增强

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-03 DOI: 10.1016/j.jmrt.2025.12.028

Shifang Li , Minghao Li , Zhu Xiao , Zhou Li , Yanlin Jia

The effect of pre-aging on the microstructure and properties of the Cu-3.0Ni-1.0Co-0.9Si alloy subjected to two-stage aging treatment was investigated. The microstructure evolution, strengthening mechanism, and softening resistance performance of the alloy during thermomechanical treatment were discussed. The results demonstrated that the pre-aged two-stage aging treatment simultaneously enhanced the mechanical properties and softening resistance performance. The alloy achieved an excellent tensile strength of 1003 MPa, a high softening temperature of 510 °C, and a considerable electrical conductivity of 40 %IACS. Notably, compared to conventional two-stage aging, this strategy resulted in significant improvements of 104 MPa in tensile strength and 35 °C in softening temperature. Microstructural analysis revealed that the enhancement was attributed to the formation of fine, dispersed precipitates during pre-aging, which were inherited into the subsequent thermomechanical process, resulting in a favorable dual-scale precipitate distribution. Furthermore, first-principles calculations and experimental evidence indicated that the low interfacial energy between these precipitates and the Cu matrix was the underlying mechanism for the low coarsening rate and high recrystallization braking force, leading to superior softening resistance. This work provided a feasible strategy for developing high-performance Cu–Ni–Co–Si alloys with an optimal combination of strength, conductivity, and thermal stability.

研究了预时效对Cu-3.0Ni-1.0Co-0.9Si合金两段时效组织和性能的影响。讨论了合金在热处理过程中的组织演变、强化机理和抗软化性能。结果表明，预时效两段时效处理同时提高了合金的力学性能和抗软化性能。该合金的抗拉强度达到1003 MPa，软化温度达到510℃，电导率达到40% IACS。值得注意的是，与传统的两阶段时效相比，该策略显著提高了104 MPa的拉伸强度和35°C的软化温度。显微组织分析表明，这种增强是由于预时效过程中形成了细小、分散的析出相，这些析出相被继承到后续的热力学过程中，形成了良好的双尺度析出相分布。此外，第一性原理计算和实验证据表明，这些析出相与Cu基体之间的低界面能是低粗化速率和高再结晶制动力的潜在机制，从而导致了优异的软化抗力。这项工作为开发高性能Cu-Ni-Co-Si合金提供了一种可行的策略，该合金具有强度、导电性和热稳定性的最佳组合。

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引用次数: 0

Estimation of the α/β region in phase diagrams and mechanical properties with heat treatment temperature in Ti-6242 alloy Ti-6242合金相图α/β区及力学性能随热处理温度的变化

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.jmrt.2025.12.034

Hyeseung Jin , Jiho Gu , Youngkyu Ju , Seungcheol Oh , Gyeongjun Ju , Yoonkon Joo , Seongmoon Seo , Jehyun Lee

This study investigates the influence of solution heat treatment temperature on the α phase fraction and resulting mechanical properties of Ti-6242 alloy. The β-transus temperature was accurately determined by differential scanning calorimetry (DSC) and validated through microstructural analysis of specimens heat-treated between 952 °C and 1000 °C. This dual approach confirmed the reliability of the DSC measurement technique. The microstructural data were then used to refine a phase equilibrium diagram using Thermo-Calc software, enhancing its predictive accuracy. It is also examined the effects of different cooling rates (water quenching vs. air cooling) on the α phase fraction and the subsequent microstructural evolution after aging. The correlation between the α phase fraction, resultant microstructures, and mechanical properties, such as strength and ductility, was systematically analyzed.

研究了固溶热处理温度对Ti-6242合金α相分数及其力学性能的影响。通过差示扫描量热法（DSC）准确测定了β-透射温度，并通过在952°C至1000°C之间热处理的试样的显微组织分析进行了验证。这种双重方法证实了DSC测量技术的可靠性。然后使用thermocalc软件将显微结构数据用于改进相平衡图，提高其预测精度。研究了不同冷却速率（水淬和空冷）对时效后α相分数和组织演变的影响。系统地分析了α相分数、微观组织与强度、塑性等力学性能之间的关系。

引用次数: 0

Fluoroalkyl silane cross-linked Mg(HCOO)0·4(OH)1.6 superhydrophobic coating on magnesium alloys with a high corrosion-resistance 氟烷基硅烷交联Mg(HCOO)0·4(OH)1.6超疏水涂层在镁合金上具有较高的耐腐蚀性

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.jmrt.2025.12.079

Zhenyu He , Chi Zhang , Xiaomeng She , Zhuanfei Liu , Zhaoyong Zou , Song Zhang , Hongwei Liu , Jian Peng , Rong Tu

The low corrosion resistance of magnesium alloys directly limits their applications in natural environments. In this work, a superhydrophobic and corrosion-resistant coating was prepared on AZ31 magnesium alloys using a combination of a sodium formate hydrothermal reaction and fluoroalkyl silane cross-linking. The hydrothermal treatment successfully generates a corrosion-resistant Mg(HCOO)_0·4(OH)_1.6 coating on the magnesium alloy surface, which exhibits a multi-scale microstructure, such as nanoscale stacking and microscale nanoflowers. The low surface energy modification of this micro-nano rough surface with fluoroalkyl silane imparted superhydrophobic properties. The coating has a corrosion inhibition efficiency of 99.999 % based on the lowest corrosion current density, i.e.,1.23 × 10⁻⁹ Acm⁻². Furthermore, the superhydrophobic coating maintains good corrosion resistance even after 30-day immersion in simulated seawater. The low frequency impedance remains 10⁵ Ωcm² during the growth cycle of A. niger. The static contact angle of the coating is 151.4°, attributed to the high-density –CF₂- and –CF₃ groups on the surface. This work provides new insights into the preparation of superhydrophobic coatings on AZ31 magnesium alloys to significantly enhance their corrosion resistance.

镁合金的耐腐蚀性低直接限制了其在自然环境中的应用。采用甲酸钠水热反应和氟烷基硅烷交联相结合的方法，在AZ31镁合金表面制备了超疏水耐腐蚀涂层。水热处理成功地在镁合金表面形成了一层耐腐蚀的Mg(HCOO) 0.4 (OH)1.6涂层，并呈现出纳米级堆积和纳米花等多尺度微观结构。用氟烷基硅烷对这种微纳粗糙表面进行低表面能改性，使其具有超疏水性。以最低腐蚀电流密度（1.23 × 10−9 Acm−2）计算，涂层的缓蚀效率为99.999%。此外，即使在模拟海水中浸泡30天，超疏水涂层仍保持良好的耐腐蚀性。在黑曲霉生长周期内，其低频阻抗保持在105 Ωcm2。由于涂层表面高密度的- cf2 -和- cf3基团，涂层的静态接触角为151.4°。本研究为AZ31镁合金制备超疏水涂层以显著提高其耐蚀性提供了新的思路。

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引用次数: 0

Sustainable epoxy composites from biogenic fillers: Mechanical and thermal characterization of flower heads of milk thistle (Cynara cardunculus) reinforced composites 生物源填料的可持续环氧复合材料：水飞蓟（Cynara cardunculus）花头增强复合材料的力学和热特性

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.jmrt.2025.12.004

Khadra B. Alomari , Mohamed Kezzar , Farhan Lafta Rashid , Mohamed Rafik Sari , Salwa Fezai , Hussain J. Alathlawi , Nadia H. Mohamed , Diaa A. Ibrahim , Ibrahim Mahariq

This study explores the development and characterization of sustainable epoxy composites reinforced with biogenic fibers extracted from the flower heads of Cynara cardunculus (milk thistle). Composites containing 6 % and 12 % fiber content by weight were fabricated using the hand lay-up technique with LY556 epoxy resin and HY951 hardener. Mechanical testing revealed that the 12 % CC/epoxy composite exhibited superior tensile stress (61.07 MPa) compared to the 6 % counterpart (48.07 MPa), although its tensile modulus was reduced. Thermal stability was assessed through thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC), indicating improved degradation resistance in higher fiber content composites. FTIR analysis confirmed the presence of key functional groups related to cellulose and lignin, validating an effective fiber-resin interaction. Scanning electron microscopy (SEM) revealed good fiber dispersion and interfacial adhesion, with signs of fiber pullout and breakage under load. Water absorption tests showed increasing moisture uptake over time, with higher absorption in composites with more fiber content. These results demonstrate the potential of milk thistle fibers as a viable reinforcement in sustainable epoxy-based composites, with promising thermal and mechanical performance for eco-friendly applications.

以水飞蓟（Cynara cardunculus）花头为原料，研究了生物纤维增强环氧复合材料的制备及其性能。以LY556环氧树脂和HY951硬化剂为原料，采用手铺法制备了纤维含量分别为6%和12%的复合材料。力学测试表明，12% CC/环氧复合材料的拉伸应力（61.07 MPa）优于6% CC/环氧复合材料（48.07 MPa），但拉伸模量有所降低。通过热重分析（TGA）和差示扫描量热法（DSC）对热稳定性进行了评估，表明高纤维含量的复合材料具有更好的抗降解性。FTIR分析证实了纤维素和木质素相关的关键官能团的存在，验证了有效的纤维-树脂相互作用。扫描电镜（SEM）显示，纤维分散良好，界面粘附良好，在载荷作用下纤维有拉拔和断裂的迹象。吸水试验表明，随着时间的推移，吸湿量增加，纤维含量越高，复合材料的吸水性越高。这些结果证明了水飞蓟纤维作为可持续环氧基复合材料的可行增强材料的潜力，在环保应用中具有良好的热学和力学性能。

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引用次数: 0

Multi-carbides segmentation and quantitative morphological parameters extraction with machine vision 基于机器视觉的多碳化物分割及定量形态参数提取

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.jmrt.2025.12.035

Yuan Liu , Shi-Zhong Wei , Shuai-Wu Tong , Tao Jiang , Liu Liu

Accurate phase segmentation is essential for effective phase identification and quantitative analysis. This paper presents a method for segmenting complex multi-carbides and extracting morphological parameters based on visual features derived from SEM image. Firstly, this method integrates thresholding and morphology algorithms, effectively addressing the challenge posed by a noisy background generated by a substantial presence of free alloys. Secondly, for the unimodal characteristic of grayscale in the SEM image, a segmentation framework is proposed that employs threshold for dual binary classifications in conjunction with bitwise AND operation. The segmented Cr-rich and V-rich carbides are consistent with the EDS, and the extracted contours effectively capture the edge details of the carbides. In addition, the analysis of the quantitative parameters indicates that as the phase area increases, there is a corresponding decrease in roundness and an increase in dispersion. This paper presents a novel and effective approach for achieving unbalanced multi-carbides segmentation, as well as for extracting quantitative morphological parameters of microscopic carbides.

准确的相位分割对于有效的相位识别和定量分析至关重要。提出了一种基于SEM图像视觉特征的复杂多碳化物分割和形态参数提取方法。首先，该方法集成了阈值分割和形态学算法，有效地解决了大量游离合金产生的噪声背景所带来的挑战。其次，针对扫描电镜图像灰度单峰化的特点，提出了一种采用阈值进行双二值分类并结合位与运算的分割框架；富cr和富v的分节碳化物与能谱图一致，提取的轮廓有效地捕获了碳化物的边缘细节。定量参数分析表明，随着相面积的增大，圆度相应减小，色散相应增大。本文提出了一种新的、有效的方法来实现不平衡的多碳化物分割，以及提取微观碳化物的定量形态参数。

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引用次数: 0

IF 6.6 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research and Technology-Jmr&t

Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.jmrt.2025.12.099

Haotian Lei , Han Zhang , Xinlei Li , Zhongyang Wan , Hao Wang , Yao Xie , Ning Guo , Shengfeng Guo

Refractory medium-entropy alloys show considerable potential for high-temperature structural applications owing to their superior mechanical properties and thermal stability. However, dissimilar welding with conventional superalloys remains challenging because of the large physical and chemical mismatches between the two kinds of materials, which tend to promote the formation of brittle phases and degrade joint performance. To overcome these issues, this study employed a Ni–Ti double-layer interlayer to conduct continuous laser welding of HfTaTi and Inconel 718 at powers of 700, 800, and 900 W. The welded joints were characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive spectroscopy, and electron backscatter diffraction. The addition Ni–Ti interlayer can weld refractory high-entropy alloys and nickel-based superalloys together, and the laser power can effectively modulate microstructure and mechanical properties. The fusion zone exhibits irregular coarse grains and abundant second-phase particles, with the average grain size increasing from 1.6 to 2.2 μm as laser power increases. Correspondingly, microhardness increases from 550 ± 10 to 740 ± 10 HV, whereas bending strength decreases from 517 to 311 MPa, a trend attributed to precipitation strengthening associated with second-phase coarsening. There is an inverse relationship between the hardness of the welded joint and its overall bending strength.

难熔中熵合金由于其优异的力学性能和热稳定性，在高温结构应用中显示出相当大的潜力。然而，由于两种材料之间存在较大的物理和化学不匹配，这往往会促进脆性相的形成，降低接头性能，因此与传统高温合金的异种焊接仍然具有挑战性。为了克服这些问题，本研究采用Ni-Ti双层中间层，在功率为700、800和900 W的情况下，对HfTaTi和Inconel 718进行了连续激光焊接。采用x射线衍射、扫描电镜、能量色散光谱和电子背散射衍射对焊接接头进行了表征。添加Ni-Ti中间层可以将难熔高熵合金和镍基高温合金焊接在一起，激光功率可以有效地调节组织和力学性能。随着激光功率的增大，熔合区晶粒大小从1.6 μm增大到2.2 μm，呈现出不规则的粗晶粒和丰富的第二相颗粒。相应的，显微硬度从550±10 HV增加到740±10 HV，而抗弯强度从517 MPa下降到311 MPa，这一趋势归因于与第二相粗化相关的析出强化。焊接接头的硬度与其整体抗弯强度呈反比关系。

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