Journal of Materials Science & Technology最新文献

{"title":"Dislocation behavior and slip plane preferences in refractory multi-principal element alloys: Insights into strength-ductility trade-offs","authors":"Zhiwen Li, Baoxian Su, Chen Liu, Zhe Li, Qingda Zhang, Zhaoqi Jiang, Binbin Wang, Ruirun Chen, Liang Wang, Yanqing Su","doi":"10.1016/j.jmst.2025.05.052","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.052","url":null,"abstract":"The intricate balance between strength and ductility in refractory multi-principal element alloys (MPEAs) represents a pivotal research challenge. This study delves into the room-temperature tensile deformation mechanisms in TiZrNbMo<em>_x</em> MPEAs, focusing on dislocation behavior and slip plane preference. Our findings reveal that an augmentation in Mo content significantly enhances strength while concurrently diminishing plasticity. Through an integrative approach, encompassing experimental observations, theoretical analyses, and computational modeling, we discern a pronounced transition in deformation mechanisms prompted by Mo incorporation. TiZrNb primarily exhibits stochastic activation of slip systems across diverse crystallographic planes, with mixed dislocations assuming a pivotal role. However, in the TiZrNbMo_0.3 alloy, the deformation mechanism transitions towards a predominant {110} slip plane, governed by the lower generalized stacking fault energy relative to other slip planes. Concurrently, the dislocation nature undergoes a transition from mixed to screw dislocations, which significantly impedes glide due to their compact core structures, thereby ultimately diminishing ductility. We ascribe the observed alterations in dislocation characteristics and slip plane preferences to variations in valence electron concentration (VEC), thus offering a mechanistic explanation for the VEC-based ductility criterion in refractory MPEAs. These findings underscore the critical role of high-VEC Mo in modulating the delicate balance between strength and ductility in these alloys. Our results furnish pivotal insights into the strategic design of MPEAs with bespoke mechanical properties, achieved through the deliberate manipulation of dislocation behavior and slip system activation.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"26 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144521405","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Rectifying lattice strain for selective photoelectrocatalytic conversion of lignin to aromatic acids","authors":"Wenliu Li, Jinshu Huang, Yuhe Liao, Bing Song, Hu Li","doi":"10.1016/j.jmst.2025.05.047","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.047","url":null,"abstract":"The *OH-mediated oxidative C(O)‒C bond breaking is an effective approach for biomass valorization but is often hampered by inefficient/competitive adsorption of the substrate and active species. Herein, a nickel doping-enabled strain engineering strategy is presented to modulate the binding ability of interfacial sites to better reduce the kinetic barriers of the reaction process. The Ni-doped CdS photoanode with an optimal strain degree of 4.85% could realize the photoelectrochemical conversion of bio-based acetophenone to benzoic acid in an ultrahigh yield of 97.6%, outperforming the state-of-the-art catalytic systems. Mechanistic investigations corroborate that the doping of Ni species into CdS nanosheets renders the electron transfer toward Cd sites and induces lattice distortion, which can facilitate the formation of *OH (on Ni with compressible strain) and adsorption of acetophenone (on Cd with tensile strain), significantly alleviating intrinsic competitive adsorption in single sites. Moreover, the strain effect enables the moving down of d orbitals of Ni sites toward the Fermi level to promote the desorption of generated *OH for subsequent nucleophilic attack of acetophenone preactivated by Cd sites, contributing to the enhanced C(O)‒C bond cleavage to afford benzoic acid. The developed photoanode was applicable to the oxidative C–C bond cleavage of various aromatic alcohols and carbonyls containing C(O)–C motifs in lignin derivatives to benzoic acids (85%–99% yields). The two-site lattice strain engineering offers a viable route to activate both substrate and catalytic species for enhanced biomass conversion and organic transformations.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"36 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Influence of short-range ordering on mechanical properties of FeCrV-based refractory medium entropy alloys via deep neural network potentials","authors":"Arman Hobhaydar, Xiao Wang, Huijun Li, Zhijun Qiu, Nam Van Tran, Hongtao Zhu","doi":"10.1016/j.jmst.2025.05.049","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.049","url":null,"abstract":"Refractory medium entropy alloys (RMEAs) have attracted significant attention in recent years due to their exceptional mechanical properties and high-temperature stability, making them suitable for a number of advanced applications. While computational modelling such as density functional theory (DFT) and molecular dynamics (MD) are powerful for investigating RMEAs, these traditional methods are often constrained by high computational cost and limited accuracy. In this work, a deep neural network potential (DNNP) was developed to address the complex compositional nature of FeCr₂V-based RMEAs with varying levels of tungsten doping. The DNNP demonstrated high accuracy, comparable to that of DFT calculations. Utilizing the DNNP, high-accuracy MD simulations were conducted to examine large-scale effects, including short-range ordering (SRO), twining, and dislocation behaviour, on the mechanical properties of the RMEAs. The results indicate that in the SRO structure, the covalency of V-V, Cr-Cr, and V-W ordered atomic pairs enhances local bonding strength and increases the elastic modulus of the RMEA. As the simulation temperature increases, dislocation mobility improves while dislocation density decreases, thereby enhancing the ductility of the material. Above 823 K, the SRO structure demonstrates superior mechanical performance, which is attributed to the increased length of 1/2&lt;111&gt;, dislocations facilitated by the formation of Cr-Fe and Cr-Cr ordered twins. This work underscores the potential of DNNP and MD simulations in predicting and analyzing the mechanical properties of RMEAs, advancing their development for various applications.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"27 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144547988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Exceptional tensile properties induced by interlayer-compatible deformation in a gradient ultra-nanograined Cu","authors":"Hangqi Feng, Qingyu Kang, Lingling Zhou, Zhenghong He, Jinliang Du, Muxin Yang, Weijie Li, Ying Li, Fuping Yuan, Xiaolei Wu","doi":"10.1016/j.jmst.2025.04.084","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.084","url":null,"abstract":"In this study, a gradient ultra-nanograined (GUNG) Cu was prepared by surface rolling and shearing processing at liquid nitrogen temperature. Microstructural analysis reveals a significant presence of ultra-nanograins (∼5–20 nm) within the topmost surface layer (SL), transitioning to coarser grains beneath, culminating in a gradient structure over 600 μm deep. The GUNG Cu exhibits an exceptional strength-ductility synergy, achieving yield strengths of 250–330 MPa and uniform elongations of 17%–30%. The deformation mechanisms of GUNG Cu are elucidated through in-situ electron backscatter diffraction and microscopic digital image correlation, highlighting the interlayer-compatible deformation of GUNG Cu under tensile loading. It is noteworthy that the topmost ultra-nanograined SL (within depths of 0–2 μm) in GUNG Cu maintains high mechanical stability with minimal change in grain size during tensile plastic deformation, whereas the subsurface layer (at a depth of ∼15 µm) displays a deformation-driven grain coarsening behavior, facilitating deformation compatibility across individual layers. The enhanced strength-ductility synergy exhibited in GUNG Cu can be attributed to the interplay between interlayer compatible deformation and hetero-deformation induced (HDI) hardening, in which softer and harder layers interact with each other, thus promoting the strain hardening throughout the GUNG structure. The present findings provide a more profound understanding of deformation compatibility and HDI hardening mechanisms in gradient structures, demonstrating how tailored microstructural heterogeneity can potentially circumvent the traditional strength-ductility trade-off in nanostructured materials.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"2 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515361","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrahigh saturation magnetization and optimized magnetic softness in a soft magnetic composite through nanoscale iron nitride","authors":"Rongsheng Bai, Jian Li, Liliang Shao, Jing Zhou, Xiaohuan Lin, Zhiyong Xue, Huaijun Lin, Haibo Ke, Weihua Wang","doi":"10.1016/j.jmst.2025.05.045","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.045","url":null,"abstract":"The miniaturization of modern devices demands soft magnetic composites (SMCs) with high saturation magnetization (<ce:italic>M</ce:italic><ce:inf loc=\"post\">s</ce:inf>). However, further enhancing <ce:italic>M</ce:italic><ce:inf loc=\"post\">s</ce:inf> through the α-Fe phase is challenging. This study explores the potential of iron nitrides particularly the Fe<ce:inf loc=\"post\">4</ce:inf>N phase for addressing this limitation. A distinctive SMC with high Fe content (84 at.%) and nanoscale Fe<ce:inf loc=\"post\">4</ce:inf>N phase was prepared using the mechanical alloying (MA) method based on pure Fe and BN powders, and subsequent facile heat treatment. By prolonging the MA period up to 100 h, the amorphous-nanocrystalline structure and refined particle size of 1.9 μm were achieved, thus promoting nitrogen doping through the open atomic packing and metastable thermodynamics. Subsequently, the nanoscale Fe<ce:inf loc=\"post\">4</ce:inf>N phase with a volume fraction of 31.4% was formed by annealing the milled sample at 650°C for 2 min, resulting in an ultrahigh <ce:italic>M</ce:italic><ce:inf loc=\"post\">s</ce:inf> of 226 emu/g, which is higher than those of amorphous-nanocrystalline and FeSi systems. Additionally, the SMC with Fe<ce:inf loc=\"post\">4</ce:inf>N phase shows optimized magnetic softness, whose core loss (<ce:italic>P</ce:italic><ce:inf loc=\"post\">cv</ce:inf>) was reduced by 67.2% compared to the SMC without Fe<ce:inf loc=\"post\">4</ce:inf>N nanocrystals. Our study not only provides a simple and effective method for introducing iron nitrides into SMCs but also presents another alternative path for significantly enhancing the <ce:italic>M</ce:italic><ce:inf loc=\"post\">s</ce:inf> of SMCs.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"634 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515359","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-functional biomedical medium entropy alloy development: Achieving concurrent optimization of mechanical properties, corrosion resistance, and biocompatibility","authors":"Xiaoyi Du, Zeyu Ding, Mingliang Wang, Yi Ma, Yiping Lu","doi":"10.1016/j.jmst.2025.05.044","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.044","url":null,"abstract":"Current metallic biomaterials face critical limitations in orthopedic applications, paradoxically exhibiting excessive stiffness alongside incompatible strength-ductility ratios and compromised corrosion resistance. These intrinsic property conflicts fundamentally restrict their clinical applicability despite the urgent demand for multi-property-integrated implants. This work presents a novel (TiZrNb<ce:inf loc=\"post\">0.7</ce:inf>)<ce:inf loc=\"post\">98</ce:inf>O<ce:inf loc=\"post\">2</ce:inf> medium-entropy alloy (MEA) with synergistic integration of high yield strength (<ce:italic>σ</ce:italic><ce:inf loc=\"post\">y</ce:inf> = 1096 MPa), substantial ductility (fracture strain <ce:italic>ε</ce:italic><ce:inf loc=\"post\">f</ce:inf> = 25.1%), and biomedically favorable modulus (<ce:italic>E</ce:italic> = 71.4 GPa). The alloy demonstrates a 35.3% lower elastic modulus compared to conventional Ti6Al4V (110 GPa), effectively mitigating stress-shielding risks. Electrochemical tests in simulated body fluid (PBS, 37°C) reveal a 0.1556 μA cm<ce:sup loc=\"post\">−</ce:sup>² corrosion current density, 1.5-fold lower than Ti6Al4V's 0.2326 μA cm<ce:sup loc=\"post\">−</ce:sup>². In vitro cellular assays demonstrated 98.3% viability of MC3T3-E1 cells following 7-day culture, outperforming Ti6Al4V controls (94.1%) by 4.2%. These findings provide valuable insights for designing metal implant materials with excellent properties.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"186 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515363","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Accurate prediction of high-temperature ionic melt viscosity through data-driven modeling enhanced with explainable AI","authors":"Seungyeon Lee, Sanghoon Lee, Il Sohn","doi":"10.1016/j.jmst.2025.06.012","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.06.012","url":null,"abstract":"The increasing demand for high-performance steels and environmentally sustainable pyrometallurgical processes has led to significant compositional variations in ionic melts and the development of novel fluxes. Optimizing ionic melt performance requires precise control of thermophysical properties, with viscosity being a key factor influencing heat and mass transport in various industrial applications. However, traditional experimental and analytical methods are often cost-prohibitive and pose challenges in generalizing findings across diverse compositions and temperatures. This study introduces MOVINet (MOlten ions VIscosity Network), a data-driven modeling framework designed to predict high-temperature ionic melt viscosity based on melt composition, temperature, and fundamental properties of 13 components, including 12 oxides and one fluoride. Trained on 1981 experimentally measured data points and evaluated using 480 independent data points, MOVINet achieved a mean absolute error (MAE) of 0.1480, reducing error by 57.7% compared to the best existing model (MAE = 0.3497). It consistently demonstrated high accuracy across six ionic melt types over a broad temperature range (1100–1870°C) and maintained low errors even for melts containing previously unseen components (e.g., MAEs of 0.0567 for CaCl<ce:inf loc=\"post\">2</ce:inf> and 0.1463 for BaO-containing samples). Furthermore, explainable AI analysis confirmed the dominant influence of temperature while highlighting compositional features affecting viscosity.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"10 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Efficient tandem electrochemical reduction of nitrate to ammonia through coupling Co2P with Co/Co2P interface","authors":"Yanbin Qu, Tianyi Dai, Guopeng Ding, Zixuan Feng, Zhili Wang, Qing Jiang","doi":"10.1016/j.jmst.2025.04.083","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.04.083","url":null,"abstract":"Electrochemical nitrate reduction reaction (&lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; RR) is a highly attractive route for both ammonia (NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt;) synthesis and wastewater treatment. The &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; RR involves the reduction of &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; to &lt;mml:math altimg=\"si2.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;2&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt;, the conversion of &lt;mml:math altimg=\"si2.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;2&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; to NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt;, and the dissociation of H&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;O to *H. However, these three reactions depend on distinct catalyst properties that are difficult to achieve in a single-site catalyst. Here a tandem catalyst of Co/Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P heterostructures encapsulated by N-doped graphene shells on carbon nanotube (Co/Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P@NG/CNT) for &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; RR were developed, achieving an attractive NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt; yield rate of 47.8 mg h&lt;ce:sup loc=\"post\"&gt;−1&lt;/ce:sup&gt; mg&lt;ce:sup loc=\"post\"&gt;−1&lt;/ce:sup&gt; with a corresponding NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt; Faradaic efficiency of 99.2% in 0.05 mol/L NO&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt;&lt;ce:sup loc=\"post\"&gt;−&lt;/ce:sup&gt; solution, exceeding most of the reported catalysts under the same &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; concentration. Experimental and theoretical studies reveal that the Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P effectively reduces &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; to &lt;mml:math altimg=\"si2.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;2&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt;, while Co/Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P interface is responsible for the subsequent conversion of &lt;mml:math altimg=\"si2.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;2&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; to NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt;. Meanwhile, the H&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;O dissociation is promoted by the Co/Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P interface to generate *H for intermediates hydrogenation. Such a tandem catalysis process accelerates the conversion of &lt;mml:math altimg=\"si1.svg\"&gt;&lt;mml:msubsup&gt;&lt;mml:mtext&gt;NO&lt;/mml:mtext&gt;&lt;mml:mn&gt;3&lt;/mml:mn&gt;&lt;mml:mo&gt;−&lt;/mml:mo&gt;&lt;/mml:msubsup&gt;&lt;/mml:math&gt; into NH&lt;ce:inf loc=\"post\"&gt;3&lt;/ce:inf&gt;. The Co/Co&lt;ce:inf loc=\"post\"&gt;2&lt;/ce:inf&gt;P@NG/CNT also ","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"62 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515365","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Ultrahigh thermal conductivity and photothermal conversion in interface-optimized bacterial cellulose/boron nitride nanosheets/MXene composites","authors":"Xinyue Liu, Zhongguo Zhao, Xin Xie, Kaiyuan Wang, Wenhu Li, Chouxuan Wang, Rong Xue, Lei Wang","doi":"10.1016/j.jmst.2025.06.010","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.06.010","url":null,"abstract":"Polymer-based thermal conductive composites (PTCs) are crucial for managing heat in microelectronics, yet the impact of filler–filler interfacial thermal resistance (ITR) on their thermal performance remains unclear despite efforts to optimize the filler–matrix interfaces. In this study, the creation of continuous thermal conductive networks with enhanced filler–filler interface contact was achieved in bacterial cellulose/boron nitride nanosheets/MXene composites (BC/BNNS/MXene) by the in-situ coating of silver nanoparticles on the surface of boron nitride nanosheets (Ag@BNNS). The homogeneously dispersed and well-exfoliated BNNS are bridged to each other via the Ag located at the surface of BNNS and a 3D thermal conductive network is formed with solid Ag junctions lying in among. The resulting 3D “branch-leaf” structure significantly enhances thermal conductivity to 18.5 W m<ce:sup loc=\"post\">−1</ce:sup> K<ce:sup loc=\"post\">−1</ce:sup> at 30 wt% Ag@BNNS filler loading, and was demonstrated by first-principles simulations, proving that the merged Ag was used as a thermal transport joint to reduce thermal contact resistance within the 3D BNNS and MXene network. Utilizing the MBAg30 composite film as a thermal interface material has been shown to effectively lower the operating temperature of smartphones, reducing it from 33.4°C to 29.0°C. The film also demonstrates efficient photothermal conversion, with a surface temperature of 83.6°C under 100 mW cm<ce:sup loc=\"post\">−2</ce:sup> light intensity and a photothermal conversion efficiency of 96.3 %. It demonstrates good stability after seven cycles and can increase ice melting rates in practical applications like agricultural greenhouses and solar heating. The present strategy provides an effective route for developing high-performance PTCs.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"24 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515364","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"In-situ synchrotron high-speed X-ray imaging of balling behavior and pore evolution during laser powder bed fusion under overhang condition","authors":"Liang Zhao, Wenquan Lu, Zhun Su, Jianguo Li, Qiaodan Hu","doi":"10.1016/j.jmst.2025.05.043","DOIUrl":"https://doi.org/10.1016/j.jmst.2025.05.043","url":null,"abstract":"The formation and evolution of defects during laser powder bed fusion (LPBF) have been extensively investigated to enhance the performance of manufactured parts. However, there remains a lack of fundamental understanding regarding defect formation and elimination mechanisms during LPBF under overhang conditions. In this study, we employed a synchrotron high-speed X-ray imaging technique to track the behavior of powder spheroidization, pore formation, and escape, as well as the impact of pore growth on molten pool surface stability during overhang build using mechanically mixed Fe-Cu powder. Our findings revealed that the notable difference in the melting degree of the powder bed is the primary driving force for balling. The coalescence of spherical droplets and the continuous wetting at the melt pool boundary with the powder bed can promote melt track growth. Additionally, numerous pores emerge within the molten pool due to the “liquid phase sintering (LPS) mechanism”. To describe pore escape behavior accurately, we established and validated a pore bursting model. Furthermore, adjacent pores can interfere with each other thereby restricting pore escape and diminishing molten pool surface stability. Overall, our results elucidate defect formation mechanisms while providing guidance for mitigating spheroidization and pores in LPBF.","PeriodicalId":16154,"journal":{"name":"Journal of Materials Science & Technology","volume":"18 1","pages":""},"PeriodicalIF":10.9,"publicationDate":"2025-06-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144515432","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}