Journal of Alloys and Compounds最新文献

{"title":"Ionic liquid derived Li6.4La3Zr1.4Ta0.6O12/polyethylene oxide solid electrolyte for high stable lithium metal batteries","authors":"Zhiang Li ,&nbsp;Shuai Liu ,&nbsp;Hao Xu ,&nbsp;Fan Ding ,&nbsp;Weimin Wang ,&nbsp;Kaikai Song ,&nbsp;Ting Liu ,&nbsp;Lina Hu","doi":"10.1016/j.jallcom.2025.180825","DOIUrl":"10.1016/j.jallcom.2025.180825","url":null,"abstract":"<div><div>Li_6.4La₃Zr_1.4Ta_0.6O₁₂ (LLZTO) is widely used in polyethylene oxide (PEO) based solid electrolytes preparation due to its high ionic conductivity, electrochemical stability towards lithium and excellent mechanical properties. However, agglomeration of LLZTO and the inert interfacial layer for Li⁺ transport between LLZTO and PEO limit its application. Herein, we systematically study the effect of different contents of 1-methyl-1-propylpiperidinium bis(trifluoromethylsulfonyl)imide (denoted as PP13-TFSI) ionic liquid on PEO/LLZTO composite solid electrolytes (CSEs). PP13-TFSI, which provides a new pathway for Li⁺ transport and promotes the uniform dispersion of LLZTO. By adjusting the proportion of PP13-TFSI reasonably, the agglomeration of LLZTO is weakened, the crystallinity of PEO is reduced, and the growth of lithium dendrites is also inhibited. Therefore, the CSEs with high ionic conductivity (2.03 × 10⁻⁴ S cm⁻¹, 30 ℃) enhanced by PP13-TFSI. Li||Li symmetric batteries exhibit stable cycling up to 6000 h at 60 °C, and can cycle stably for up to 3000 h at 28 °C. LiFePO₄||Li full batteries exhibit high-capacity retention rate (≈ 90.5 %) after 500 cycles at 1 C. This work not only systematically study the effects of different contents of PP13-TFSI on CSEs, but also provide a simple composite solid electrolyte strategy.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1030 ","pages":"Article 180825"},"PeriodicalIF":5.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920481","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}

{"title":"Impact of additive manufacturing-induced partitioning of hafnium on oxidation behavior of IN738 Ni-based superalloy","authors":"KenHee Ryou, Hyeonbeen Noh, Yejun Park, Shoichi Nambu, Pyuck-Pa Choi","doi":"10.1016/j.jallcom.2025.180762","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180762","url":null,"abstract":"Peculiar oxidation behaviors of additively manufactured (AMed) Inconel 738 (IN738) Ni-based superalloy, influenced by AMed microstructures and the reactive element hafnium (Hf), were investigated. This study compared the oxidation behaviors of Hf-added and Hf-free direct-laser-deposited IN738. Hf induces microstructural heterogeneity and significant elemental partitioning between the dendrite cores and interdendritic regions in direct-laser-deposited Ni-based superalloys. The effects of Hf on the oxidation behavior of IN738 were examined, revealing that Hf enhances oxidation resistance by promoting early Hf oxide peg formation and the development of a protection layer. The formation of interconnected Hf channels originating from partitioned Hf was observed as oxidation progressed. The channeling structure facilitated the transport of Hf from the base alloy to the surface and contributed to the formation of a protection layer made of Hf oxide. The Hf-driven protection layer effectively suppressed oxidation compared to alloys without Hf. The synergy between Hf and the AMed microstructure by directed energy deposition was crucial for this enhanced oxidation resistance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915576","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}

{"title":"Enhanced degradation of tetracycline hydrochloride by recyclable 3D N-TiO2/Fe3O4/rGO magnetic heterojunction driving peroxydisulfate and H2O2 activation under visible light irradiation: Performance and mechanism","authors":"H.Y. Fu, Z.L. Chen, D.Y. Wu, Y.C. Wu, H.B. Guo, P.F. Gao, H. Wang, L. Jin","doi":"10.1016/j.jallcom.2025.180832","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180832","url":null,"abstract":"In this work, a simple one-step hydrothermal method was employed to synthesize recyclable magnetic heterojunction N-TiO&lt;sub&gt;2&lt;/sub&gt;/Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt;/rGO (NTFG) nanocomposites for the activation of peroxydisulfate (PDS) and H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt; in the removal of the emerging contaminant tetracycline hydrochloride (TCH). Under visible irradiation, the TCH removal rate in the NTFG/PDS/Vis system was nearly complete at 99.9% (the kinetic rates of 0.1531&lt;!-- --&gt; &lt;!-- --&gt;min&lt;sup&gt;-1&lt;/sup&gt;) compared to 98.8% in the NTFG/H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;/Vis system (the kinetic rates of 0.1133&lt;!-- --&gt; &lt;!-- --&gt;min&lt;sup&gt;-1&lt;/sup&gt;). The excellent catalytic activities of both systems were attributed to the special 3D structure of magnetic heterojunction N-TiO&lt;sub&gt;2&lt;/sub&gt;/Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; (NTF) nanoparticles uniformly dispersed on wrinkled rGO, which promoted interfacial contact between different components. The incorporation of rGO and the formation of a direct Z-scheme heterojunction between the N-TiO&lt;sub&gt;2&lt;/sub&gt; and Fe&lt;sub&gt;3&lt;/sub&gt;O&lt;sub&gt;4&lt;/sub&gt; broadened the visible-light response range and effectively prevented the recombination of photogenerated electrons and holes. Encouragingly, rGO functions as an electron transfer medium to expedite electron transfer, while Fe(III)/Fe(II) cycling on the surface of NTFG further enhances the activation of PDS in the NTFG/PDS/Vis system. For the NTFG/H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;/Vis system, rGO not only decomposed H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt; through an electron transfer mechanism but also effectively promoted Fe(III)/Fe(II) cycling in the Fenton process. Both systems maintained high TCH removal rates after five cycles (the NTFG/PDS/Vis system for 98.2% while the NTFG/H&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;2&lt;/sub&gt;/Vis system for 91.9%), demonstrating NTFG reusability and magnetic recoverability. Additionally, the NTFG/PDS/Vis system demonstrates a broader pH application range and greater ability to interfere with higher concentrations of humic acid (HA). In both systems, ·OH, &lt;span&gt;&lt;span style=\"\"&gt;&lt;/span&gt;&lt;span data-mathml='&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msubsup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mtext is=\"true\"&gt;O&lt;/mtext&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"bold\" is=\"true\"&gt;&amp;#xB7;&lt;/mi&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;/mrow&gt;&lt;/msubsup&gt;&lt;/math&gt;' role=\"presentation\" style=\"font-size: 90%; display: inline-block; position: relative;\" tabindex=\"0\"&gt;&lt;svg aria-hidden=\"true\" focusable=\"false\" height=\"3.009ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -945.9 1654.9 1295.7\" width=\"3.844ex\" xmlns:xlink=\"http://www.w3.org/1999/xlink\"&gt;&lt;g fill=\"currentColor\" stroke=\"currentColor\" stroke-width=\"0\" transform=\"matrix(1 0 0 -1 0 0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMAIN-4F\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(778,432)\"&gt;&lt;g is=\"true\"&gt;&lt;us","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"14 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915616","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}

{"title":"Volume Contractible Triplumbic Tetroxide Pb3O4 (Lead Oxide) as a Negative Electrode Material For Lithium-Ion Batteries","authors":"A Andrews Cyril, Ankit Dev Singh, Ghanshyam Varshney, Ayan Dey, Manjesh Kumar Mishra, Srijan Sengupta","doi":"10.1016/j.jallcom.2025.180838","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180838","url":null,"abstract":"India ranks as the seventh largest lead producer, producing around 204,000 MT in 2020. This shows that India has a higher level of ample lead availability. In addition, the lead-acid battery market in India was estimated to grow from $4.86B in FY 2020 to $8.57B in FY 2027. Because of their widespread availability and inexpensive price, lead-acid batteries (LAB) have been the go-to for energy storage for over a century. Thus, the quantity of LAB waste also grows. There have been many suggestions for improving the recycling rate of lead-acid waste batteries, which currently stands at around 66%. Batteries using lithium chemistry have been extensively studied due to their high energy characteristics, which might be used for large-scale energy storage and vehicle electrification, even though lithium-ion batteries are now shaping modern energy storage techniques. The demand for energy storage is on the rise, and electric vehicles are a significant contributor. Improving the cyclability, charging rate, stability, and safety of next-generation Li-ion batteries not to mention their specific energy and volumetric energy density will need significant research and development efforts. In order for them to keep up with the current production demand, this is essential. To meet this demand, we are upgrading from inefficient lead-acid batteries to more contemporary lithium-ion batteries. Future lithium-ion batteries will employ lead alloys and compounds as their anodes because of their high theoretical efficiency, cheap cost, and large working capacity. Consequently, a negative electrode made of lead-based anode Pb₃O₄ was developed in this study with a volume contractible strategy, which helps to reduce the volume expansion. The gravimetric and volumetric specific capacities of the Pb₃O₄ negative electrode, even after 100 cycles, are 369<!-- --> <!-- -->mAh/g (same as pristine graphite) and 3063 mAh/cc (~3 times that of the graphite). Therefore, this cheap and highly scalable electrode can be vouched as a potential replacement for graphite in lithium-ion batteries.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"20 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920482","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}

{"title":"Grain growth mechanism of AlNiCo magnetic alloy under different withdrawal rates","authors":"Huiyuan Luan ,&nbsp;Zhihe Zhao ,&nbsp;Yueqing Liu ,&nbsp;Min Huang ,&nbsp;Lei Liu ,&nbsp;Yong Ding ,&nbsp;Aru Yan ,&nbsp;Yingli Sun ,&nbsp;Jiangtao Zhao","doi":"10.1016/j.jallcom.2025.180853","DOIUrl":"10.1016/j.jallcom.2025.180853","url":null,"abstract":"<div><div>Accurately controlling the solidification process and finely regulating the grain structure of AlNiCo alloy are necessary steps to improve magnetic properties. AlNiCo were directionally solidified through immersion in a Ga-In alloy liquid bath at varying withdrawal rates (1 mm/min, 3 mm/min, 6 mm/min and 9 mm/min) to optimize grain architecture. This paper investigates the effect of withdrawal rate on the grain structure of AlNiCo and explains the mechanism of grain growth through simulation. With the increase of the withdrawal rates, the size of the grain decreases from 1.525 mm to 0.62 mm and the growth direction becomes random. When the withdrawal rate is lower than 3 mm/min, the grains of AlNiCo have larger size and better orientation, but the magnetic properties are optimal when the withdrawal rate is 3 mm/min (<em>M</em>_<em>s</em>=11.20kGs, <em>B</em>_<em>r</em>=10.82kGs, <em>H</em>_<em>c</em>=1.719 kOe, <em>(BH)</em>_<em>max</em>= 11.20MGOe). This is because the large variations in size and the high number of “isolated island crystals” exacerbate the unevenness of the grain structure, in turn, decreasing <em>(BH)</em>_<em>max</em> and <em>H</em>_<em>c</em>. The simulation results show that too fast or too slow withdrawal rate can cause heat exchange imbalanced, resulting in the liquid-solid interface to bend and grain orientation deviating from the solidification direction. Increasing the withdrawal rate will lead to an increase in undercooling, resulting in a higher nucleation density, which is the main reason for grain refinement. In addition, a withdrawal rate of 3 mm/min can achieve a larger temperature gradient, which slows down the lateral growth of grains and thus reduces the occurrence of “isolated island crystals” grains. Through finer control of the solidification process, it is expected to achieve a more uniform grain structure, further enhancing the magnetic properties of AlNiCo.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1029 ","pages":"Article 180853"},"PeriodicalIF":5.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915574","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}

{"title":"Carbon vacancy induced metallicity and lattice distortion for superior mechanical properties in niobium carbide","authors":"Wang Chen ,&nbsp;Weiwei Dong ,&nbsp;Shuailing Ma ,&nbsp;Min Lian ,&nbsp;Hao Song ,&nbsp;Mingyang Du ,&nbsp;Xingbin Zhao ,&nbsp;Jiarong Cheng ,&nbsp;Songpeng Zhang ,&nbsp;Bao Yuan ,&nbsp;Xiaodong Li ,&nbsp;Tian Cui","doi":"10.1016/j.jallcom.2025.180796","DOIUrl":"10.1016/j.jallcom.2025.180796","url":null,"abstract":"<div><div>Niobium carbide (NbC) has been considered as one of the most significant carbides due to the high hardness and thermal stability, although it usually exhibits low fracture toughness. Thus, to improve the toughness without hardness deterioration is one of the most challenging issues in material science. In present work, non-stoichiometric NbC_<em>x</em> (0.6 ≤ <em>x</em> ≤ 1) with controlled carbon vacancies was synthesized under high pressure (5 GPa) and high temperature (2200 °C) conditions trying to enhance the mechanical properties of NbC_<em>x</em> by refined microstructures. The effects of carbon vacancies on the mechanical properties and superconductivity of NbC_<em>x</em> were systematically investigated. The mechanical properties, including Vickers hardness and fracture toughness obtained from Anstis equation, improved with increasing carbon vacancy concentration, with NbC_0.85 exhibiting optimal hardness values of 23.3 ± 0.3 GPa and fracture toughness of 4.3 ± 0.4 MPa m^1/2, representing ∼10 % and ∼23 % improvements, respectively, compared to stoichiometric NbC. This enhancement was attributed to the reduced covalent bonding and increased metallic bonding, which promoted crack deflection. Furthermore, low-temperature resistance measurements revealed decreased superconducting transition temperature from 11.1 K for NbC to 7.1 K for NbC_0.85 due to the effect of carbon vacancies on the electronic structure. These findings highlight the potential of carbon vacancy engineering to enhance the mechanical performance of NbC_<em>x</em> ceramics, providing a new strategy for designing advanced high-performance materials.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1029 ","pages":"Article 180796"},"PeriodicalIF":5.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915614","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}

{"title":"Cobalt-modified graphene nanosheets/cellulose thermally conductive composite films fabricated via layer-by-layer self-assembly approach","authors":"Huijie Lu, Ting Zhang, Tianyu Lu, Bin Yang, Xiaohong Wang, Ru Xia, Jiaojiao Sang, Qiangwei Liu, Jiasheng Qian, Yuqing Yang, Ning Jia","doi":"10.1016/j.jallcom.2025.180833","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180833","url":null,"abstract":"As the integration of electronic devices continues to increase, the heat generated by electronic components presents significant thermal management challenges. Thermal interface materials thus play more and more crucial role in ensuring the reliability of electronic devices. Cobalt nanoparticles (Co) were first coated onto the surface of graphene nanosheets (GNS) and grafted with maleimide (MI) to form Co@MI-GNS filler. This filler was then evenly dispersed in a carboxylated nanocellulose (CNF) matrix, and a series of Co@MI-GNS/CNF thermally conductive composite films were successfully fabricated using a layer-by-layer (LBL) self-assembly method. During the preparation process, the “C-N-C” covalent bonds were in-situ formed, enhancing the establishment of stable hydrogen bonds between the fillers and the matrix. As compared to other fabrication methods, such as blade coating or template drying, the Co@MI-GNS/CNF films produced by this approach indeed exhibited superior thermal conductivity (TC). The interfacial thermal resistance of the composite films was obtained as 9.41×10^{-10<!-- -->}m²·K·W^-1 using the Foygel model, indicating a significant improvement on the thermal transfer efficiency. Theoretical predictions were found to be consistent with thermal dissipation tests conducted on light emitting diode and computer central processing unit. The LBL self assembly proved to be a promising technique for fabricating polymer-based TIMs with ultra-high in-plane TC as well as excellent mechanical flexibility, making it particularly suitable for flexible electronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"35 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143915612","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}

{"title":"Soft impingement informed modeling framework for precipitation kinetics of T1 in Al-Cu-Li alloy with experimental verification","authors":"Aparna Tripathi, Purnima Bharti, Devendra Kumar","doi":"10.1016/j.jallcom.2025.180839","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180839","url":null,"abstract":"In the present work, a modeling framework is developed to simulate the precipitation kinetics of <span><math><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\">T</mi></mrow><mrow is=\"true\"><mn is=\"true\">1</mn></mrow></msub></math></span> in Al-Cu-Li alloy. The effect of soft impingement of diffusion fields around neighboring precipitates on the growth rate is incorporated in the model. An analytical expression of time-varying concentration field assuming 2-D diffusion of solutes around precipitates is derived. The simulation is performed at an ageing temperature of <span><math><mn is=\"true\">150</mn><mspace is=\"true\" width=\"0.25em\"></mspace><mi is=\"true\">℃</mi></math></span> for three different levels of pre-strain, 5%, 10% and 20%. Temporal evolution of the phase transformation parameters of <span><math><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\">T</mi></mrow><mrow is=\"true\"><mn is=\"true\">1</mn></mrow></msub></math></span> such as volume fraction, average diameter, number density and matrix solute concentration is obtained from the model. These parameters are validated against the experimental data obtained in this work using TEM, XRD and DSC characterization. Model prediction of parameters are found to be in close agreement with the experimental values. Furthermore, the model captures the effect of pre-strain on aging kinetics precisely, i.e. with increasing deformation amount ageing kinetics enhances. Consideration of soft impingement, spatial arrangement of <span><math><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\">T</mi></mrow><mrow is=\"true\"><mn is=\"true\">1</mn></mrow></msub></math></span> precipitates and their morphological evolution are found to be critical factors in the model to produce results consistent with experiment. Present model is found to be significantly more accurate than the widely popular software Thermo-Calc (TC-PRISMA module) for predicting <span><math><msub is=\"true\"><mrow is=\"true\"><mi is=\"true\">T</mi></mrow><mrow is=\"true\"><mn is=\"true\">1</mn></mrow></msub></math></span> growth kinetics.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"53 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920484","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}

{"title":"Hot isostatic pressure treatment and high-temperature oxidation behavior of a LaB6/TiAl-based composite fabricated by laser powder bed fusion","authors":"Xiaolong Xu ,&nbsp;Chenglong Ma ,&nbsp;Ziwen Xie ,&nbsp;Quanlong Wang ,&nbsp;Chaofeng Zhang ,&nbsp;Meiping Wu","doi":"10.1016/j.jallcom.2025.180841","DOIUrl":"10.1016/j.jallcom.2025.180841","url":null,"abstract":"<div><div>Hot isostatic pressure (HIP) treatment was applied to densify and tailor the microstructure of the laser powder bed fused high-Nb TiAl composite reinforced by LaB₆ in this study. The results showed that the HIP treatment significantly decreased the crack density by 86.67 %. Besides, the HIP treatment further resulted in a microstructure evolution from a single α₂-phase with coarsen columnar grain to a heterogeneous microstructure of α₂+ γ lamellar colony and equiaxed γ grain. Meanwhile, due to HIP-induced continuous dynamic recrystallization and pining effect of in-situ La₂O₃ nanoparticles, the average grain size was remarkably refined from 8.607 μm to 4.722 μm. Subsequently, the high-temperature oxidation behavior of the HIP-ed TiAl composite was evaluated at 900°C. The oxidation progression was found to be mainly controlled by ionic diffusion. After oxidation for 100 h, the oxide scale exhibited a four-layer structure including a TiO₂ layer, an (Al, Cr)₂O₃ layer, a TiN/Ti₂AlN layer, and an AlNb₂ layer. Notably, the AlNb₂ layer was just formed at the interface of the oxide layer and matrix, thus effectively reducing oxygen penetration into the substrate. By comparing with other works, the HIP-ed sample in this work exhibited a much lower oxide layer thickness in the intact region free of any defects. On one hand, it can be attributed to a superior heterogeneous microstructure induced by HIP. On the other hand, the in-situ La₂O₃ nanoparticles with an excellent thermal stability also play a positive role in increasing diffusion barrier of oxygen. In general, this work presents a new LPBF-fabricated TiAl-based composite system and helps to give more insight into its high-temperature oxidation behavior.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1029 ","pages":"Article 180841"},"PeriodicalIF":5.8,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920479","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}

{"title":"Recent advancement in selective gas sensors and role of machine learning","authors":", Partha Bir Barman, Anjan Sil, Surajit Kumar Hazra","doi":"10.1016/j.jallcom.2025.180757","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180757","url":null,"abstract":"Research on selective gas sensors got significant attention in recent years due to industrialization and rising levels of greenhouse gases/pollutants in the atmosphere. Apart from the detection of gases and volatile organic compounds (VOCs) special emphasis on hydrogen (H₂) detectors is given because H₂ is a good source of renewable energy. Nowadays, gas sensors are installed in indoor and outdoor locations. Moreover, high-performance selective gas sensors are also used in space exploration and to monitor human health. All these applications require enhancement of gas sensing properties, especially gas selectivity of sensing devices. This review discusses the conventional selectivity and the new Machine Learning (ML) selectivity approaches. In the conventional scheme, some of the most common synthesis methods of sensing material and their effect on morphology and device selectivity have been discussed. The incorporation of noble metals and various composites has been found to make sensors extremely sensitive and selective due to the synergistic effect of composite configuration. In modern approach, the selectivity problem of a sensor while facing a mixture of gases has been resolved by analysing the output signals of the sensor using ML techniques. An attempt has been made to compare/evaluate novel advancements in various ML techniques and provide a summary of the prediction accuracy and the classification of gases.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"96 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143920480","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}