Journal of Alloys and Compounds最新文献

{"title":"Investigation into the correlation between composition, microstructure, and mechanical properties of Al-xFe-(6-x)Mn alloys","authors":"Xinyue Lan, Yunpeng Zheng, Kai Li, Biao Hu, Jiong Wang, Qiang Lu, Yao Xiao, Jiayi Wen, Xin Zheng, Yong Du","doi":"10.1016/j.jallcom.2025.181455","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181455","url":null,"abstract":"The Al-Fe-Mn alloy system exhibits excellent thermal stability, making it a promising candidate for heat-resistant aluminum alloys. Nevertheless, systematic investigations into the influence of Fe/Mn ratio and cooling rate on the microstructural evolution and mechanical properties of Al-Fe-Mn alloys remain insufficient. In this work, Al-xFe-(6-x)Mn alloys prepared at two cooling rates were studied by tensile test, nanoindentation, TEM, etc. The results show that the co-addition of Mn and Fe can promote the transformation of coarse Al₁₃Fe₄ or lamellar Al₆Mn phase to Al₆(Fe, Mn) fibers. In addition, when the Fe/Mn ratio is 1, the matrix stacking fault energy is the lowest, and the Al/Al₆(Fe, Mn) is coherent: (3 1 1)_{Al6(Fe, Mn)}//(0 0 2)_Al, (2 -2 1)_{Al6(Fe, Mn)}//(-1 1 1)_Al. The coherent interface generally enhances the thermal stability of the reinforcement phase due to the minimized interfacial energy. Nanoindentation results show that the hardness of the matrix and Al₆(Fe, Mn) is the lowest when Fe/Mn is 1, among which the low hardness of the matrix is a reflection of the low stacking fault energy, while the hardness of Al₆(Fe, Mn) is inversely proportional to the entropy value. High cooling rate can promote the transformation of skeleton-like Al₆(Fe, Mn) into fibers of about 100<!-- --> <!-- -->nm, greatly improving the mechanical properties of the alloy. The hardness of the chilled Al-4Fe-2Mn alloy is significantly higher than that of other alloys, reaching 115 HV. This work can provide important reference for improving the mechanical properties and heat resistance of heat-resistant alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"101 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228767","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":"Excellent corrosion resistance of Fe37Ni37Cr20Al3Ti3 medium entropy alloy induced by sequential passivation strategy","authors":"Jie Cheng, Yujie Ma, Xiaotian Wang, Liang Cheng, Zhenhua Cao","doi":"10.1016/j.jallcom.2025.181437","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181437","url":null,"abstract":"In this study, microstructure and long-term corrosion behavior of a novel Fe₃₇Ni₃₇Cr₂₀Al₃Ti₃ medium entropy alloy (MEA) were investigated. The MEA was composed of FCC matrix phase with a few Al-rich monoclinic and Ti-rich HCP phases. The corrosion resistance of the MEA was first enhanced and then weakened with the corrosion time prolonging, which could be attributed to the decrease of O^2-/OH^- ratio and Cr₂O₃ content in the passive film. The MEA exhibited more excellent corrosion resistance than the 316<!-- --> <!-- -->L. The sequential passivation of Al-rich, Ti-rich and FCC phases induced by micro-galvanic corrosion effect was responsible for the good anti-corrosion performance of the MEA. The pitting was initially nucleated on Al-rich phase, which the formed passive film was preferentially to be destroyed by Cl ions.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"42 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228693","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":"Achieving high strength and ductility in multiscale (TiC+(TiZr)5Si3)/TA15 composites via spark plasma sintering and hot rolling","authors":"Qiang Wang, Zhao-Hui Zhang, Xing-Wang Cheng, Xiao-Tong Jia, Yang-Yu He, Jin-Zhao Zhou, Yuan-Hao Sun","doi":"10.1016/j.jallcom.2025.181466","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181466","url":null,"abstract":"A (TiC + (TiZr)₅Si₃)/TA15 composite was successfully fabricated using polycarbosilane (PCS) and TA15 alloy as starting materials via spark plasma sintering followed by hot rolling. This processing route resulted in simultaneous enhancements in both strength and ductility. The present study systematically investigates the microstructural evolution and mechanical performance of the composite before and after hot rolling. Compared with the as-sintered condition, the hot-rolled composite exhibits significant grain refinement and the development of a pronounced T-type texture in the α-Ti matrix. Mechanical testing reveals that the hot-rolled composite with 1<!-- --> <!-- -->wt.% PCS achieves a yield strength (YS) of 1334<!-- --> <!-- -->MPa, an ultimate tensile strength (UTS) of 1422<!-- --> <!-- -->MPa, and a total elongation of 17.2%. Increasing the PCS content to 2<!-- --> <!-- -->wt.% leads to further improvements in YS and UTS, reaching 1456<!-- --> <!-- -->MPa and 1542<!-- --> <!-- -->MPa, respectively, albeit with a reduction in ductility to 2.3%. At 600 °C, the tensile strengths of the hot-rolled composites with 1<!-- --> <!-- -->wt.% and 2<!-- --> <!-- -->wt.% PCS reach 929<!-- --> <!-- -->MPa and 1037<!-- --> <!-- -->MPa, respectively, demonstrating excellent high-temperature mechanical performance. Further analysis indicates that grain boundary strengthening, dislocation strengthening, and texture strengthening are the primary contributors to the enhanced strength of the as-rolled composites. Meanwhile, the improved ductility is primarily attributed to grain refinement, enhanced matrix connectivity, and the activation of multiple slip systems during tensile deformation.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"7 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228682","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":"Integrated experimental and theoretical insights into the structural, mechanical, and thermal behavior of AlTiNbTaZrSiN coatings","authors":"Hua D. Zhang, Jian W. Du, Xiang D. Zhang, Li Chen, Yi Kong, She Q. Wang, Yu Z. Wang","doi":"10.1016/j.jallcom.2025.181443","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181443","url":null,"abstract":"Refractory AlTiNbTaZrSiN coatings were investigated to explore the composition-driven effects on their structure, mechanical, and thermal properties employing both experimental and computational techniques. Progressive substitution of Me (Nb + Ta + Zr + Si) in Al_1-x-zTi_x(Me)_zN (z ≥ 0.37) was found to induce a transformation from a single cubic structure to a dual cubic-wurtzite structure, with Si content identified as the primary driver of this transition. Increasing the Me content within the cubic-structured Al_1-x-zTi_x(Me)_zN resulted in a continuous increase in hardness (<em>H</em>), rising from ~29.3<!-- --> <!-- -->GPa for Al_0.45Ti_0.55N to ~35.7<!-- --> <!-- -->GPa for Al_0.41Ti_0.41(Me)_0.18N, accompanied by an improvement in indentation toughness. However, a rapid drop in mechanical properties was observed upon the formation of the wurtzite-AlN (w-AlN) in Al_0.40Ti_0.23(Me)_0.37N and Al_0.39Ti_0.17(Me)_0.44N. After thermal annealing, the compositional adjustments and the resulting entropy-enhanced state were shown to contribute to the delayed decomposition and age hardening in Al_0.40Ti_0.23(Me)_0.37N and Al_0.39Ti_0.17(Me)_0.44N at elevated temperatures, as supported by the thermodynamic evaluation of the integrated energy, entropy, and strain effects.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228753","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":"Atomic-Level Ru Skin Alloy for tailoring effective catalytic performance of Li-CO2 battery","authors":"Yao Liu, Jinhui Zhang, Tengwen Yan, Guanghui Jin, Jianru Zhao, Yuxuan Wang, Dongxiao Kan, Guangtong Hai, Dashuai Wang, Jing Xu","doi":"10.1016/j.jallcom.2025.181448","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181448","url":null,"abstract":"Li-CO&lt;sub&gt;2&lt;/sub&gt; batteries boasted a remarkable theoretical energy density of up to 1876 W h‧kg&lt;sup&gt;-1&lt;/sup&gt;, offering a dual-functionality as an integrated system for CO&lt;sub&gt;2&lt;/sub&gt; conversion and energy storage. Li-CO&lt;sub&gt;2&lt;/sub&gt; batteries face challenges related to sluggish reaction kinetics. This study introduced Ru skin alloy structure, integrating strain and ligand effects into the alloy, to finely tune the reactivity and activity of surface Ru atoms. The Ir/Ru, in contrast to Ru(001), exhibited a shift in the pathway selectivity of discharge reactions, while it showcased the low total overpotential of 0.82&lt;!-- --&gt; &lt;!-- --&gt;V, positioning it as a superior dual-functional catalyst. Meanwhile, a volcano-like correlation was observed between CO&lt;sub&gt;2&lt;/sub&gt; adsorption energy and catalytic performance of M/Ru skin alloy. The catalyst with &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;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msub&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=\"2.548ex\" role=\"img\" style=\"vertical-align: -0.812ex;\" viewbox=\"0 -747.2 2163.8 1096.9\" width=\"5.026ex\" 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-45\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(681,-155)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-43\"&gt;&lt;/use&gt;&lt;use transform=\"scale(0.707)\" x=\"722\" xlink:href=\"#MJMAIN-4F\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1061,-107)\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.5)\" xlink:href=\"#MJMAIN-32\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/g&gt;&lt;/svg&gt;&lt;span role=\"presentation\"&gt;&lt;math xmlns=\"http://www.w3.org/1998/Math/MathML\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"normal\"&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\" mathvariant=\"normal\"&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;E&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;msub is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"normal\" is=\"true\"&gt;CO&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt; of the range of -0.6&lt;!-- --&gt; &lt;!-- --&gt;eV - -0.4&lt;!-- --&gt; &lt;!-- --&gt;eV indicated promising catalytic performance in Li-CO&lt;sub&gt;2&lt;/sub&gt; batteries. The intrinsic descriptor φ was established and efficiently used ","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"33 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228925","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":"Nickel mesh-based catalysts with crystalline-amorphous synergistic catalytic effect for enhanced efficiency and stability in alkaline water electrolysis at ampere-level current densities","authors":"Zhuoao Li, Pengbo Ding, Lixiu Guan, Dan Xing, Qitao Lian, Yingxuan Cao, Zixuan Zhang, Shuo Zhang, Junguang Tao","doi":"10.1016/j.jallcom.2025.181457","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181457","url":null,"abstract":"Amid the pressing need for sustainable hydrogen production, developing high-performance electrocatalysts for alkaline electrolysis using nickel-based materials has become increasingly important, which are widely used in industry due to their robustness and cost-effectiveness. In this study, we report the electrochemical deposition-fabricated P-Co(OH)₂/NM and P-NiFe catalysts, which shows excellent performance in the hydrogen evolution reaction and oxygen evolution reaction, respectively. Specifically, P-Co(OH)₂/NM achieved overpotentials of 41<!-- --> <!-- -->mV at 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 and 240<!-- --> <!-- -->mV at 1000<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2, while P-NiFe compound exhibited overpotentials of 278<!-- --> <!-- -->mV and 403<!-- --> <!-- -->mV at these currents, respectively. These improvements are attributed to the synergistic effects of crystalline and amorphous phases and the unique porous structure formed via the dynamic hydrogen bubble template method. The assembled electrolyzer demonstrated superior overall water splitting (OWS) performance, requiring only 1.57<!-- --> <!-- -->V at 10<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 and 1.81<!-- --> <!-- -->V at 1000<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2, with remarkable stability exceeding 1000<!-- --> <!-- -->h. When the OWS temperature is increased to 60 °C, the performance was further enhanced, achieving 1000<!-- --> <!-- -->mA<!-- --> <!-- -->cm^-2 at just 1.72<!-- --> <!-- -->V. With their simple synthesis and unique structure, these catalysts hold great promise for industrial applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"18 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228688","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":"Effect of grain size on formability of AZ31 alloy sheets","authors":"Zihuan Hua, Shengwen Bai, Bin Jiang, Yan Yang, Weijun He, Jiangfeng Song","doi":"10.1016/j.jallcom.2025.181467","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181467","url":null,"abstract":"The AZ31 magnesium alloy sheets are processed using specific rolling and annealing techniques, resulting in five sheets with different average grain sizes ranging from 7.4 μm to 116.8 μm, all exhibiting a strong basal texture. Tensile, compressive, bending, and Erichsen cupping tests are conducted to evaluate the effect of grain size on formability. Grain sizes between 38 μm and 77.7 μm notably improve compressive properties and facilitate <span><span style=\"\"><math><mo is=\"true\" stretchy=\"false\">{</mo><mn is=\"true\">10</mn><mover accent=\"true\" is=\"true\"><mrow is=\"true\"><mn is=\"true\">1</mn></mrow><mo is=\"true\">̅</mo></mover><mn is=\"true\">2</mn><mo is=\"true\" stretchy=\"false\">}</mo></math></span><span style=\"font-size: 90%; display: inline-block;\" tabindex=\"0\"></span><script type=\"math/mml\"><math><mo stretchy=\"false\" is=\"true\">{</mo><mn is=\"true\">10</mn><mover accent=\"true\" is=\"true\"><mrow is=\"true\"><mn is=\"true\">1</mn></mrow><mo is=\"true\">̅</mo></mover><mn is=\"true\">2</mn><mo stretchy=\"false\" is=\"true\">}</mo></math></script></span> tensile twinning during bending, enhancing bendability by resisting neutral layer migration, particularly in the 45° direction. In the Erichsen cupping test, coarse grains promote twinning and increase the capacity for coordinating the strain in the c-axis direction, boosting I.E. values. However, when the grain size reaches 116.8 μm, dislocation pile-up at grain boundaries causes stress concentration, which accelerates crack initiation, and both bendability and stretch formability are reduced.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"19 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228691","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":"Challenges and opportunities in additive manufacturing of high entropy alloys","authors":"Mohammad Taghian, Ali Pilehvar Meibody, Abdollah Saboori, Luca Iuliano","doi":"10.1016/j.jallcom.2025.181450","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181450","url":null,"abstract":"High entropy alloys (HEAs) are a class of multi-principal element alloys that exhibit promising properties for structural and functional applications. Additive manufacturing (AM) techniques provide a pathway for fabricating HEAs with complex geometries and tailored compositions. This paper reviews the recent progress in developing HEAs using laser-based (directed energy deposition, laser powder bed fusion) and electron beam-based (electron beam powder bed fusion) AM processes. A wide range of HEAs, including CoCrFeMnNi, Al_xCoCrFeNi, refractory HEAs, and interstitial-solute hardened HEAs, have been fabricated through AM of gas/water atomized powders or elemental powder blends. Processing parameters such as laser power, scan speed, and hatch distance significantly influence the microstructure, phases, and defects in laser-based AM-printed HEAs. Rapid solidification during AM suppresses phase segregation and elemental partitioning, leading to refined microstructures with enhanced mechanical properties compared to cast counterparts. Post-treatments, including annealing, hot isostatic pressing, and laser shock peening, reduce residual stresses and porosities in AM-printed HEAs. Future opportunities lie in developing compositionally graded, dual-phase, and composite HEAs through AM to optimize properties further. Standardized models are needed to predict optimized AM parameters for defect-free printing of new HEAs.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"39 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228685","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 CO2 sensing properties of Fe/Al-Doped SnO2 thin films: a comprehensive study of structural, optical, and electrical characteristics","authors":"Dikra Bouras, Mamoun Fellah, Dunya Zeki Mohammed, Regis Barille, Aleksei Obrosov, Gamal A. El-Hiti, Ahlem Guesmi, Lotfi Khezami","doi":"10.1016/j.jallcom.2025.181387","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181387","url":null,"abstract":"This study investigates the effects of iron (Fe) and aluminum (Al) doping on tin oxide (SnO₂) thin films for carbon dioxide (CO₂) gas sensing applications. Thin films of pure SnO₂ and SnO₂ doped with varying concentrations (3-10<!-- --> <!-- -->wt.%) of Fe and Al were prepared using a sol-gel dip-coating method. The structural, optical, and electrical properties of the films were characterized using X-ray diffraction (XRD), Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), Atomic force microscope (AFM), UV-Vis spectroscopy, and Hall Effect measurements. The results reveal that doping significantly alters the crystalline structure, surface morphology, optical bandgap (increasing to 4.14<!-- --> <!-- -->eV with 10<!-- --> <!-- -->wt.% Al and decreasing to 3.21<!-- --> <!-- -->eV with 10<!-- --> <!-- -->wt.% Fe), and electrical conductivity of SnO₂. Fe doping generally led to larger pore sizes and higher conductivity, while Al doping resulted in smaller, more uniform pores and a transition to p-type conductivity at higher concentrations. CO₂ sensing tests demonstrated enhanced sensitivity and response times for both dopants, with 10<!-- --> <!-- -->wt.% Fe-doped SnO₂ showing the highest sensitivity. Notably, 10<!-- --> <!-- -->wt% Fe:SnO₂ exhibited the highest CO₂ sensitivity of about 1.05, while 10<!-- --> <!-- -->wt.% Al:SnO₂ showed the fastest response time of 20<!-- --> <!-- -->s (sensitivity 0.7). Such a comprehensive analysis provides insights into the mechanisms of CO₂ detection and the potential for tailoring SnO₂-based sensors through strategic doping for improved performance in environmental monitoring and industrial applications.The work is novel and takes a systematic approach to analyze how these two dopants affect the structural, optical, electrical, and gas sensing properties of SnO₂ across a range of doping concentrations (3-10<!-- --> <!-- -->wt.%). This study introduces a comparative analysis of dual-doping with Fe and Al, which has not been systematically explored in the context of CO₂ sensing using SnO₂ thin films. The observed synergy between the dopants, especially the trade-off between sensitivity and response time, offers a new perspective for optimizing gas sensor design.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"447 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228694","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":"Solvoleaching Approach for SmCo5 Alloy Scrap and Production of Sodium Samarium Sulfate and Cobalt Oxide","authors":"Prasanjit Das, Binapani Behera, Kali Sanjay, Niharbala Devi","doi":"10.1016/j.jallcom.2025.181469","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181469","url":null,"abstract":"The SmCo₅ magnet alloy is a powerful magnet used in defence, aerospace, and automotive transmissions. While shaping to form different magnets, a lot of scraps are produced. These wastes offer a sustainable way to recover the critical metals, Sm and Co, reducing reliance on primary raw materials. This study investigates the recovery of Sm and Co from SmCo₅ magnet alloy scrap using solvometallurgical techniques, which utilise organic solvents for metal extraction while minimising water usage compared to traditional methods. Various organophosphorus extractants were tested as lixiviant, with the solvoleaching efficiency order D2EHPA &gt; PC 88<!-- --> <!-- -->A &gt; Cyanex 572 &gt; Cyanex 272, reflecting their decreasing acidity and influence on metal dissolution. The optimal solvoleaching conditions: 2<!-- --> <!-- -->mol/L D2EHPA concentration, 80 °C temperature, 8<!-- --> <!-- -->hours leaching time, 400<!-- --> <!-- -->rpm agitation speed, and 10<!-- --> <!-- -->g/L pulp density resulted in near-complete recovery of samarium and cobalt. Samarium and cobalt were effectively separated from strip leach liquor using the sodium sulfate double salt precipitation method. Samarium was recovered as NaSm(SO₄)₂·nH₂O with a precipitation efficiency of 99.9% under optimised conditions: 80 °C temperature, 90<!-- --> <!-- -->minutes reaction time, Na₂SO₄:Sm molar ratio of 4:1, and pH 1.25. Cobalt in the residual solution was precipitated as cobalt oxalate with an efficiency of 99.7% at 60 °C temperature, 60<!-- --> <!-- -->minutes reaction time, and 1.25:1 oxalate to cobalt molar ratio. The precipitated cobalt oxalate was calcined at 450 °C, forming cobalt oxide (Co₃O₄). This study demonstrates solvometallurgical method as high-yield, sustainable solution for efficient SmCo₅ magnet recycling with minimal environmental impact.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"24 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144228686","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}