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Performance enhancement of hybrid kenaf/bamboo fibre-reinforced bio-epoxy composites for sustainable structural applications 复合红麻/竹纤维增强生物环氧复合材料的可持续结构性能增强
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-03 DOI: 10.1016/j.jmrt.2025.12.017
Sameer A. Awad , Omar Awayssa , Mohammad Jawaid , Ahmad Safwan Ismail , Naheed Saba , Mariyum Yaseen , Mohini Sain , Hassan Fouad
In this study, bamboo (B) and kenaf (K) fibres were employed as reinforcements in bio-epoxy matrices to develop biocomposites, aiming to evaluate their mechanical, thermal, and morphological properties. Biocomposites fabricated by Hand lay-up techniques by using different formulations. TGA results indicated that the biocomposites maintained thermal stability up to 230 °C before decomposition, with complete degradation occurring at 600 °C. The findings demonstrated that hybrid biocomposites exhibited superior mechanical performance; however, the sample (K50) exhibited the greatest tensile strength among all the biocomposites, which was approximately 43 MPa. On the other hand, the 5K/5B biocomposite exhibits the maximum elongation at break, approximately 2 %. The K50 biocomposite showed the highest flexural strength among all samples. DMA analysis revealed an increase in the storage modulus (É) for hybrid biocomposites, indicating improved stiffness and reduced damping. According to the DMA results, the storage modulus values were enhanced compared to those of the single biocomposites, while the loss modulus exhibited lower values with the hybrid biocomposites. Following, the storage modulus increased from 3566.92 MPa (K50) to 3764.14 MPa for the optimised hybrid composite (5K/5B), indicating improved stiffness under load. Likewise, the loss modulus increased from 300.48 MPa (K50) to 360.65 MPa (3K/7B), which confirms improved energy dissipation capability and stronger fibre–matrix interlocking. SEM analysis provided insights into fibre-matrix adhesion and bonding, confirming that the integration of hybrid natural fibres enhances the overall properties of bio-epoxy composites. In contrast, the WA and TS percentages exhibited higher values. Thus, incorporating the kenaf fibres with bamboo as hybrid biocomposites in this study would meet the demand for sustainable packaging, serving as a viable alternative to conventional plastics and enhancing environmental sustainability. From the TMA findings, the results indicate that the 3K/7B biocomposite has the highest CTE value, indicating the most significant thermal expansion among the samples. These combined improvements demonstrate strong potential for use in lightweight automotive structures, building panels, and eco-friendly consumer products where greater strength and thermal resistance are needed.
在这项研究中,竹(B)和红麻(K)纤维被用作生物环氧树脂基质的增强剂来开发生物复合材料,旨在评估它们的机械、热和形态性能。生物复合材料的手工制作技术,通过使用不同的配方。TGA结果表明,生物复合材料在230°C前保持热稳定性,在600°C时完全降解。结果表明:混杂生物复合材料具有优异的力学性能;然而,样品(K50)在所有生物复合材料中表现出最大的拉伸强度,约为43 MPa。另一方面,5K/5B生物复合材料表现出最大的断裂伸长率,约为2%。K50生物复合材料的抗弯强度最高。DMA分析显示,混合生物复合材料的存储模量增加(É),表明刚度提高,阻尼降低。根据DMA结果,与单一生物复合材料相比,存储模量值有所提高,而混合生物复合材料的损耗模量则有所降低。随后,优化后的混合复合材料(5K/5B)的存储模量从3566.92 MPa (K50)增加到3764.14 MPa,表明载荷下的刚度有所提高。同样,损耗模量从300.48 MPa (K50)增加到360.65 MPa (3K/7B),证实了增强的能量耗散能力和更强的纤维基质互锁。扫描电镜分析提供了纤维基质粘附和粘合的见解,证实了混合天然纤维的集成提高了生物环氧复合材料的整体性能。相比之下,WA和TS百分比表现出更高的值。因此,在这项研究中,将红麻纤维与竹子作为混合生物复合材料将满足可持续包装的需求,作为传统塑料的可行替代品,并提高环境的可持续性。从TMA结果来看,3K/7B生物复合材料具有最高的CTE值,表明样品中热膨胀最显著。这些综合改进显示出在需要更高强度和耐热性的轻型汽车结构、建筑面板和环保消费产品中使用的巨大潜力。
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引用次数: 0
Design optimization of metastructures integrating machine learning with energy-based homogenization 整合机器学习与能量同质化的元结构设计优化
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-11-27 DOI: 10.1016/j.jmrt.2025.11.234
Ermias Shimelis , Haemin Jeon , Seongjin Cho , Jinho Bang , Jin-Ho Bae , G.M. Kim , Daeik Jang , Beomjoo Yang
This study introduces a multi-objective topology optimization framework for designing metastructures with enhanced effective bulk and shear moduli, employing an energy-based homogenization approach. The method utilizes a modified Solid Isotropic Material with Penalization (SIMP) scheme integrated with finite element (FE) analysis, sensitivity analysis, and optimality criteria. The optimization examines diverse initial layouts, volume fractions, and weighting factors to achieve balanced mechanical properties. Additionally, a convolutional neural network (CNN) model was developed to rapidly and accurately predict mechanical properties from microstructural images, attaining coefficients of determination (R2) of 0.94 for bulk modulus and 0.96 for shear modulus. Experimental validation through 3D-printed polylactic acid (PLA) metastructures demonstrated strong agreement with FE simulations, with errors between 3.76 % and 7.31 %.
本研究引入了一个多目标拓扑优化框架,用于设计具有增强有效体积和剪切模量的元结构,采用基于能量的均匀化方法。该方法采用改进的固体各向同性材料惩罚(SIMP)方案,结合有限元分析、灵敏度分析和最优性准则。优化检查了不同的初始布局、体积分数和权重因素,以实现平衡的机械性能。此外,开发了卷积神经网络(CNN)模型,可以快速准确地从微观结构图像中预测力学性能,获得体积模量的决定系数(R2)为0.94,剪切模量的决定系数(R2)为0.96。通过3d打印聚乳酸(PLA)元结构进行的实验验证与有限元模拟结果非常吻合,误差在3.76%到7.31%之间。
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引用次数: 0
Laser powder bed fusion of a support-free overhang structure using a donut-shaped laser beam 利用环形激光束对无支撑悬垂结构进行激光粉床熔接
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-05 DOI: 10.1016/j.jmrt.2025.12.053
Meng Wu, Liqiao Wang, Zhenhua Zhang, Defan Wu, Guojie Liu, Zhongyang Sui, Peng Zhao, Heng Zhang, Quanquan Han
Laser powder bed fusion (LPBF) enables the rapid fabrication of complex components, yet the manufacturing of overhangs below 45° requires support structures, which limits the design freedom of LPBF. In this study, a donut beam was developed and employed for the support-free fabrication of IN718 alloy via LPBF. The effects of beam shape on the microstructure, processability, and overhang quality at 25° were systematically investigated. The results demonstrated that the donut beam offered excellent LPBF processability, enabling the fabrication of full-density IN718 parts across a broad processing window, with comparable tensile performance under both 25 °C and 650 °C conditions. In terms of microstructure, the IN718 alloy grains fabricated under the donut beam were more elongated, with an average grain ratio of 5.7, which was much higher than that of the Gaussian beam (3.7). The texture index was also considerably higher (6.2 compared to 3.2 for the Gaussian beam). The donut beam enabled the successful manufacturing of 25° overhang specimens without the addition of support structures, achieving the target height with only 0.18 mm top-surface deformation. In contrast, the Gaussian beam failed to manufacture the support-free 25° overhang specimens due to severe warpage and deformation, with some losing features by up to 8°. Numerical simulation revealed the mechanism of beam shape on dross formation and the warpage behaviour of overhang structures. This study offers positive guidance for the application of donut-shaped laser beams in the LPBF of low-angle overhang components.
激光粉末床熔合(LPBF)能够快速制造复杂的部件,但制造45°以下的悬垂需要支撑结构,这限制了LPBF的设计自由度。在本研究中,开发了一种环形梁,并将其用于LPBF制备IN718合金的无支撑。系统地研究了在25°温度下,梁形对显微组织、可加工性和悬垂质量的影响。结果表明,环形梁具有优异的LPBF可加工性,能够在宽加工窗口内制造全密度IN718零件,在25°C和650°C条件下具有相当的拉伸性能。在显微组织方面,环形束下加工的IN718合金晶粒更加拉长,平均晶粒比为5.7,远高于高斯束(3.7)。纹理指数也相当高(与高斯光束的3.2相比为6.2)。圆环梁使25°悬垂试件的成功制造无需添加支撑结构,实现了仅0.18 mm顶面变形的目标高度。相比之下,高斯光束由于严重的翘曲和变形而无法制造无支撑的25°悬垂样品,其中一些特征损失高达8°。数值模拟揭示了梁形对悬垂结构变形和变形的影响机理。该研究为环形激光束在低角悬垂构件LPBF中的应用提供了积极的指导。
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引用次数: 0
The dual role of short-range order: A critical temperature switch between strengthening and weakening in high-entropy alloys 短阶的双重作用:高熵合金中强化与弱化之间的临界温度转换
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-04 DOI: 10.1016/j.jmrt.2025.12.037
B. Zhao , H.Y. Song , M.R. An
Short-range order (SRO) structures have recently attracted significant attention as an effective strategy for tailoring the mechanical properties of high-entropy alloys (HEAs). However, the underlying mechanisms governing the interactions between SRO structures and dislocation interactions remain inadequately elucidated. In this study, we systematically investigate the influence of SRO structure on the deformation behavior of the FeNiCrCo HEAs under shear loading using a hybrid Monte Carlo/molecular dynamics simulation method. The results demonstrate that the critical resolved shear stress (CRSS) of the HEAs decreases with increasing temperature, regardless of whether the alloys contain SRO structures. Notably, a critical transition temperature is identified: above this threshold, the SRO structures can enhance the CRSS, whereas below it, they diminish the CRSS. Further analysis reveals that the CRSS of the SRO_HEA is governed by a combination of solid solution strengthening from the matrix and additional strengthening induced by the SRO within Cr-rich region. In contrast, the CRSS of the RSS_HEA depends solely on solid solution strengthening. The temperature dependence of the CRSS in the SRO_HEAs is primarily attributed to the varying contributions of these two strengthening mechanisms with temperature. Moreover, as the degree of SRO increases, the lattice distortion in the matrix attenuates, the area of Cr-rich regions on the dislocation slip plane expands, and phonon scattering decreases—all factors facilitating dislocation motion. These findings provide fundamental insights into the microstructure design of the HEAs based on SRO engineering.
近年来,短程有序(SRO)结构作为一种调整高熵合金(HEAs)力学性能的有效策略引起了人们的广泛关注。然而,控制SRO结构和位错相互作用之间相互作用的潜在机制仍然没有充分阐明。在本研究中,我们采用蒙特卡罗/分子动力学混合模拟方法系统地研究了SRO结构对FeNiCrCo HEAs剪切载荷下变形行为的影响。结果表明,无论合金是否含有SRO组织,HEAs的临界分解剪应力(CRSS)都随温度升高而降低。值得注意的是,我们确定了一个临界转变温度:超过这个阈值,SRO结构可以增强CRSS,而低于这个阈值,它们会减弱CRSS。进一步分析表明,SRO_HEA的CRSS是由基体的固溶强化和富cr区SRO诱导的附加强化共同作用的结果。相反,RSS_HEA的CRSS仅依赖于固溶体强化。SRO_HEAs中CRSS的温度依赖性主要归因于这两种强化机制对温度的不同贡献。此外,随着SRO程度的增加,基体中的晶格畸变减弱,位错滑移面上富cr区面积扩大,声子散射减少,这些都是促进位错运动的因素。这些发现为基于SRO工程的HEAs微结构设计提供了基础见解。
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引用次数: 0
From filler–polymer interfacial rearrangements to silica enrichment: Microstructural origins of mechanical degradation in hydrothermally aged HTV silicone rubber 从填料-聚合物界面重排到二氧化硅富集:水热老化HTV硅橡胶机械降解的微观结构根源
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-10 DOI: 10.1016/j.jmrt.2025.12.100
Manar Ramram , Lénaïk Belec , Jean-François Chailan , François Perseil Rouillard , François-Xavier Perrin
This study presents the evolution of standard mechanical properties of a silica-filled silicone rubber subjected to cyclic ageing conditions, including vacuum phases at 80 °C and high-pressure steam phases at 134 °C. The observed changes in mechanical properties are associated with molecular and macromolecular-scale transformations reported in a previous study. Over the course of ageing, Shore A hardness increased in correlation with rising silica content. The observed loss of elastic recovery, indicated by the compression set, was linked to alterations in network topology, particularly due to complex rearrangements at the polymer–filler interfaces. Monotonic tensile tests at both low and high strain levels revealed the respective impacts of increasing silica content and polymer network hydrolysis. Additionally, the changes in the Mullins effect was associated with microstructural changes. The tensile behavior was modeled using a hyperelastic approach incorporating a hydrodynamic amplification factor, which supported a phenomenological understanding of the ageing effects on both monotonic tensile responses and the Mullins effect.
本研究展示了含硅硅橡胶在80°C真空相和134°C高压蒸汽相循环老化条件下标准力学性能的演变。在先前的研究中,观察到的力学性能的变化与分子和大分子尺度的转化有关。在时效过程中,邵氏硬度随二氧化硅含量的增加而增加。压缩集表明,观察到的弹性恢复损失与网络拓扑结构的改变有关,特别是由于聚合物-填料界面的复杂重排。在低应变和高应变水平下的单调拉伸试验揭示了增加二氧化硅含量和聚合物网络水解的各自影响。此外,Mullins效应的变化与微观结构的变化有关。拉伸行为使用包含流体动力放大因子的超弹性方法进行建模,这支持了对单调拉伸响应和Mullins效应的老化效应的现象学理解。
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引用次数: 0
High-temperature evolution and deformation behavior of residual modified Al2O3 inclusions in Si-killed and Ce-treated GCr15 bearing steel si - ce处理GCr15轴承钢中残余改性Al2O3夹杂物的高温演化与变形行为
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-06 DOI: 10.1016/j.jmrt.2025.12.056
Yichi Zhu , Wan Zheng , Zirui Yan , Daoyao Liu , Guangqiang Li , Jing Liu
Cerium treatment was used to modify residual Al2O3 inclusions in Si-killed GCr15 bearing steel, and high-temperature evolution and deformation behavior of these residual inclusions were studied to assess their harmfulness. The results indicated cerium treatment can modify Al2O3, SiO2 and MnS inclusions in as-cast Ce-free steel (S0) into finer, near-spherical Ce–S–Al–O composite inclusions in Ce-treated steel (S1, 0.017 wt% Ce). During isothermal heating at 1473 K for 120 min, these initially glassy Ce–S–Al–O composite inclusions in as cast S1 steel evolved into Ce2S3(core)–Al2O3(shell) multiphase composite inclusions by crystallization, which is attributed to first precipitation of the thermodynamically more stable Ce2S3 at the core of the inclusions and to outward diffusion of aluminum and oxygen atoms due to the repulsive effect of Ce2S3 crystals, froming an Al2O3 shell layer with crescent moon shape on the inclusion surface. Gleeble hot-compression simulations revealed that the deformation index (ν) of inclusions in Ce-treated steel S1 (average ν ≈ 0.36) is significantly lower than that in Ce-free steel S0 (average ν ≈ 0.67), mainly because of the higher toughness of Ce2S3 (core) compared to MnS in S0 steel and the restraining deformation effect of the rigid Al2O3 shell of the dual phase inclusions in S1 steel. The coordination deformation of Ce2S3(core)–Al2O3(shell) composite inclusions in steel significantly reduced stress brittleness of Al2O3 shell like single polygonal Al2O3 inclusions during hot-deformation process, the fatigue performance of the tested steel still needs to be further verified.
采用铈处理方法对si -kill GCr15轴承钢中残余Al2O3夹杂物进行了改性,研究了残余Al2O3夹杂物的高温演化和变形行为,并对其危害性进行了评价。结果表明:铈处理能使铸态无Ce钢(S0)中的Al2O3、SiO2和MnS夹杂物(S1, 0.017 wt% Ce)转变为更细的近球形Ce- s- al - o复合夹杂物。在1473 K等温加热120 min的过程中,铸态S1钢中最初呈玻璃状的Ce-S-Al-O复合夹杂物通过结晶转变为Ce2S3(核心)-Al2O3(壳)多相复合夹杂物,这主要是由于在夹杂物的核心处首先析出热力学更稳定的Ce2S3,以及由于Ce2S3晶体的排斥作用,铝原子和氧原子向外扩散所致。在夹杂物表面形成新月形的Al2O3壳层。Gleeble热压缩模拟结果表明,ce处理钢S1的夹杂物变形指数ν(平均ν≈0.36)显著低于无ce钢S0的夹杂物变形指数ν(平均ν≈0.67),这主要是由于Ce2S3(核心)的韧性高于S0钢的MnS,以及S1钢中双相夹杂物坚硬的Al2O3壳层对变形的抑制作用。钢中Ce2S3(芯)-Al2O3(壳)复合夹杂物在热变形过程中的配位变形明显降低了Al2O3壳的应力脆性,就像单一多边形Al2O3夹杂物一样,试验钢的疲劳性能还有待进一步验证。
{"title":"High-temperature evolution and deformation behavior of residual modified Al2O3 inclusions in Si-killed and Ce-treated GCr15 bearing steel","authors":"Yichi Zhu ,&nbsp;Wan Zheng ,&nbsp;Zirui Yan ,&nbsp;Daoyao Liu ,&nbsp;Guangqiang Li ,&nbsp;Jing Liu","doi":"10.1016/j.jmrt.2025.12.056","DOIUrl":"10.1016/j.jmrt.2025.12.056","url":null,"abstract":"<div><div>Cerium treatment was used to modify residual Al<sub>2</sub>O<sub>3</sub> inclusions in Si-killed GCr15 bearing steel, and high-temperature evolution and deformation behavior of these residual inclusions were studied to assess their harmfulness. The results indicated cerium treatment can modify Al<sub>2</sub>O<sub>3</sub>, SiO<sub>2</sub> and MnS inclusions in as-cast Ce-free steel (S0) into finer, near-spherical Ce–S–Al–O composite inclusions in Ce-treated steel (S1, 0.017 wt% Ce). During isothermal heating at 1473 K for 120 min, these initially glassy Ce–S–Al–O composite inclusions in as cast S1 steel evolved into Ce<sub>2</sub>S<sub>3</sub>(core)–Al<sub>2</sub>O<sub>3</sub>(shell) multiphase composite inclusions by crystallization, which is attributed to first precipitation of the thermodynamically more stable Ce<sub>2</sub>S<sub>3</sub> at the core of the inclusions and to outward diffusion of aluminum and oxygen atoms due to the repulsive effect of Ce<sub>2</sub>S<sub>3</sub> crystals, froming an Al<sub>2</sub>O<sub>3</sub> shell layer with crescent moon shape on the inclusion surface. Gleeble hot-compression simulations revealed that the deformation index (ν) of inclusions in Ce-treated steel S1 (average ν ≈ 0.36) is significantly lower than that in Ce-free steel S0 (average ν ≈ 0.67), mainly because of the higher toughness of Ce<sub>2</sub>S<sub>3</sub> (core) compared to MnS in S0 steel and the restraining deformation effect of the rigid Al<sub>2</sub>O<sub>3</sub> shell of the dual phase inclusions in S1 steel. The coordination deformation of Ce<sub>2</sub>S<sub>3</sub>(core)–Al<sub>2</sub>O<sub>3</sub>(shell) composite inclusions in steel significantly reduced stress brittleness of Al<sub>2</sub>O<sub>3</sub> shell like single polygonal Al<sub>2</sub>O<sub>3</sub> inclusions during hot-deformation process, the fatigue performance of the tested steel still needs to be further verified.</div></div>","PeriodicalId":54332,"journal":{"name":"Journal of Materials Research and Technology-Jmr&t","volume":"41 ","pages":"Pages 635-647"},"PeriodicalIF":6.6,"publicationDate":"2026-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145738277","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
Microstructure evolution and mechanical performance of diffusion-bonded Ti-6.5Al–2Zr–1Mo–1V alloy components fabricated by preform hot isostatic pressing 预成形热等静压扩散结合Ti-6.5Al-2Zr-1Mo-1V合金构件的组织演变及力学性能
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-09 DOI: 10.1016/j.jmrt.2025.12.091
Langping Zhu , Jiemin He , Xing Ran , Fan Gao , Zhe Wang , Zhiheng Du , Xiaohang Zhang , Zhenxi Li , Hao Huang , Wei Xu , Xin Lu
Ti-6.5Al–2Zr–1Mo–1V (TA15) is a lightweight and heat-resistant titanium alloy increasingly adopted for aerospace structures. Conventional routes for manufacturing complex TA15 components, however, often suffer from high material wastage and low processing efficiency. To overcome these limitations, we employed a hot isostatic pressing diffusion-bonding (HIP-DB) strategy that integrates preform part with powder to produce near-net-shape parts. This study systematically investigates the evolution of microstructure, tensile properties at room-temperature, high-temperature endurance, and fatigue performance of fabricated parts at various processing temperatures. Results indicate that specimens processed at 950 °C exhibit excellent performance associated with a trimodal microstructure, namely with a tensile strength of about 1050 MPa, elongation of about 22.5 %, endurance times of about 170h, and fatigue life of about 6.2 × 105 cycles at 700 MPa for powder, solid, and interface regions. Compared with the specimens fabricated at 930 °C, the tensile strength and elongation of specimen fabricated at 950 ° C increased by about 20 % and 10 %, respectively, while that for endurance life and fatigue life at 700 MPa increased about 5 and 6.2 times, respectively. Enhanced interfacial bonding, comparable grain sizes across the interface, and effective crack propagation barriers contribute to the observed improvements in endurance and fatigue resistance of the interface regions. The findings provide valuable insights into the advanced manufacturing of high-performance, complex-shaped TA15 alloy components for aerospace fields.
Ti-6.5Al-2Zr-1Mo-1V (TA15)是一种轻质耐热钛合金,越来越多地用于航空航天结构。然而,制造复杂TA15组件的传统路线往往存在高材料浪费和低加工效率的问题。为了克服这些限制,我们采用了热等静压扩散键合(HIP-DB)策略,将预制件与粉末集成在一起,以生产接近净形状的零件。本研究系统地研究了不同加工温度下制造件的显微组织、室温拉伸性能、高温耐久性和疲劳性能的演变。结果表明,在950℃下处理的试样表现出优异的三模态组织,即在700 MPa下,粉末区、固体区和界面区的抗拉强度约为1050 MPa,延伸率约为22.5%,耐久时间约为170h,疲劳寿命约为6.2 × 105次。与930℃下试样相比,950℃下试样的抗拉强度和伸长率分别提高了约20%和10%,700 MPa下的耐久寿命和疲劳寿命分别提高了约5倍和6.2倍。增强的界面结合、可比较的界面晶粒尺寸以及有效的裂纹扩展屏障有助于观察到界面区域的耐久性和抗疲劳性的改善。研究结果为航空航天领域高性能、复杂形状的TA15合金部件的先进制造提供了有价值的见解。
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引用次数: 0
Interfacial uniformity control of Al/steel butt joint via rotating laser-GMAW hybrid welding-brazing 旋转激光- gmaw复合焊-钎焊铝/钢对接接头界面均匀性控制
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-02 DOI: 10.1016/j.jmrt.2025.11.252
Jiang Yu , Yuan Zhuang , Long Lin , Yadong Ju , Huanyu Li , Lin Li , Tao Yang
The excessively hard and brittle steel-aluminum(Fe-Al) intermetallic compounds (IMCs) have adverse effects on the performance of Al/steel dissimilar material joining, even degrading their mechanical properties seriously. For this, most sound Al/steel butt welded-brazed dissimilar joints were achieved via this rotating laser-GMAW welding technique in the present study, in which the formation of Fe-Al IMCs was effectively suppressed by adding the additional alloying element Si, and the interfacial structure was effectively controlled by inserting a rotating laser, respectively. The detailed effect process of the Si element and the rotating laser was investigated in terms of Finite element analysis, interfacial structure, and the changed mechanical properties. The results indicated that the temperature distribution at the interface was adjusted based on the rotating laser beam, achieving the uniform distribution of the interfacial temperature. Moreover, the addition of Si elements enabled the formation of Al-Si-Fe IMCs at the interface, thereby replacing the original Fe-Al IMCs. Finally, a uniform brazing interface layer composed of a single τ5-Al8Fe2Si phase was formed at the final Al/steel interface under the combined effect of these two factors. When the rotating laser beam diameter was 2.0 mm, optimal thickness uniformity was observed. At this time, the tensile strength of the joint reached 218 MPa, approximately 75 % of the Al base metal.
钢-铝(Fe-Al)金属间化合物(IMCs)的过硬脆会对铝/钢异种材料连接的性能产生不利影响,甚至严重降低其力学性能。为此,本文采用旋转激光- gmaw焊接技术实现了大多数良好的Al/钢对接钎焊异种接头,其中通过添加额外的合金元素Si有效抑制了Fe-Al IMCs的形成,通过插入旋转激光有效控制了界面结构。从有限元分析、界面结构和力学性能变化等方面详细研究了硅元素与旋转激光的作用过程。结果表明:利用旋转激光束调节界面温度分布,实现了界面温度的均匀分布;此外,Si元素的加入使界面形成Al-Si-Fe IMCs,从而取代了原来的Fe-Al IMCs。最后,在这两个因素的共同作用下,在最终的Al/钢界面形成了由单个τ5-Al8Fe2Si相组成的均匀钎焊界面层。当旋转激光束直径为2.0 mm时,厚度均匀性最佳。此时,接头的抗拉强度达到218 MPa,约为Al母材的75%。
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引用次数: 0
Mechanical and tribological properties of a refractory high entropy HfMoNbTaTiVWZr thin film metallic glass implanted with nitrogen ions 氮离子注入难熔高熵HfMoNbTaTiVWZr薄膜金属玻璃的力学和摩擦学性能
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-11 DOI: 10.1016/j.jmrt.2025.12.114
Karolina Stępniak , Farid Akhtar , Kinga Jasiewicz , Neonila Levintant-Zayonts , Aleksandra Królicka , Dariusz M. Jarząbek
This study examines nitrogen ion implantation's effects on the microstructure, mechanical behavior, and tribological performance of an octonary high-entropy thin film metallic glass HfMoNbTaTiVWZr. Ion implantation led to binary nitride formation, elemental redistribution, and surface modifications while maintaining significant degree of amorphization, what indicates local atomic rearrangement rather than crystallization. Structural and chemical analyses using TEM, XRD, and EDS mapping revealed phase stability changes and preferential segregation of heavy elements like hafnium and tantalum at high doses. Hardness enhancement was attributed to solid solution strengthening, fine nitride formation, increased lattice distortion, residual stress, and densification. At an optimal implantation dose (1e17 ions/cm2), hardness increased to 20 GPa, reducing the coefficient of friction and improving wear resistance. A comparison with a magnetron-sputtered (HfMoNbTaTiVWZr)N thin film showed distinct hardness-depth profiles, confirming localized strengthening effects. These findings highlight nitrogen implantation as an effective surface engineering technique for optimizing material performance in demanding applications.
本文研究了氮离子注入对八元高熵薄膜金属玻璃HfMoNbTaTiVWZr的微观结构、力学行为和摩擦学性能的影响。离子注入导致二元氮化物形成、元素重分布和表面修饰,同时保持显著程度的非晶化,这表明局部原子重排而不是结晶。利用TEM、XRD和EDS图谱进行的结构和化学分析揭示了在高剂量下,铪和钽等重元素的相稳定性变化和优先偏析。硬度的提高是由于固溶体强化、细氮化物的形成、晶格畸变、残余应力和致密化的增加。在最佳注入剂量(1e17离子/cm2)下,硬度提高到20 GPa,降低了摩擦系数,提高了耐磨性。与磁控溅射(HfMoNbTaTiVWZr)N薄膜相比,显示出不同的硬度深度分布,证实了局部强化效果。这些发现突出了氮注入作为在苛刻应用中优化材料性能的有效表面工程技术。
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引用次数: 0
Frictional behavior of two-dimensional BxN (x=2, 3 and 5) induced by composite bond networks 复合键网络诱导二维BxN (x= 2,3和5)的摩擦行为
IF 6.6 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY Pub Date : 2026-03-01 Epub Date: 2025-12-08 DOI: 10.1016/j.jmrt.2025.12.061
Yuan Niu , Rong Gao , Wenhao He , Haibo Ruan , Zhibin Lu
It is well known that different bonding networks, while having similar elemental and structural characteristics, can bring a wide variety of physical properties to the material. In this paper, we present first-principles calculations of the frictional behavior and electronic structure of two-dimensional (2D) boron-rich materials BxN (x = 2, 3 and 5). The calculations show that, apart from the significant differences in electrical properties, the special bonding environment in these boron-rich materials also leads to very different friction behaviors. Through analysis the bonds strengths of intralayer, as well as the transfer of interface charges, we discovered that this remarkable friction behavior is due to the synergistic effect of the complex bonding network and the evolution of interface charges. This study, starting from the basic physical mechanisms, reveals the friction behavior of 2D boron-rich BxN compounds, providing useful insights for their widespread application in mechanical electronic devices.
众所周知,不同的键合网络虽然具有相似的元素和结构特征,却能给材料带来多种多样的物理性能。在本文中,我们提出了二维(2D)富硼材料BxN (x = 2,3和5)的摩擦行为和电子结构的第一性原理计算。计算表明,除了电性能的显著差异外,这些富硼材料中特殊的键合环境也导致了非常不同的摩擦行为。通过分析层内的键强度,以及界面电荷的转移,我们发现这种显著的摩擦行为是由于复杂的键网络和界面电荷的演化的协同作用。本研究从基本物理机制出发,揭示了二维富硼BxN化合物的摩擦行为,为其在机械电子器件中的广泛应用提供了有益的见解。
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引用次数: 0
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Journal of Materials Research and Technology-Jmr&t
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