Journal of Alloys and Compounds最新文献

{"title":"Optimization Mechanism of Mechanical Properties in TC4 Titanium Alloy via Si/Y Co-doping","authors":"Haiyue Zhan, Zhaoyu Zhang, Wenya Shi, Yongwu Li, Yuyang Guo, Jiajun Ma, Hualin Li, Han Guo, Long Feng, Jiang Wang, Qingrong Yao, Jianqiu Deng, Lichun Cheng, Zhao Lu, Qianxin Long","doi":"10.1016/j.jallcom.2025.184185","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184185","url":null,"abstract":"Titanium alloys, leveraging advantages such as high strength and low density, are widely applied in aerospace, automotive, medical, and other fields, but they face challenges including significant processing difficulty, performance degradation during long-term high-temperature service, and insufficient wear resistance. In the present work, the effects of Si and Y co-doping on the microstructure and mechanical properties of Ti-6Al-4V alloys were investigated. The experimental results showed that the addition of Si and Y promoted the formation of β-phase，facilitated the nucleation of yttrium oxides at dimples, and altered the tensile fracture mode. Mechanical property tests of the alloy show that Si-Y doping exerts a significant optimization effect on the strength and toughness of the Ti64 alloy. It not only increases the compressive strength from the original 528<!-- --> <!-- -->MPa to 711<!-- --> <!-- -->MPa, but also raises the elongation from 10.1% to 13.1%, which not only verifies the synergistic enhancement effect of this doping scheme on strength and toughness, but also provides key support for the regulation of alloy properties.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"18 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235008","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":"Ultrafast Laser Synthesis of Cr2AlC MAX Phase and Selective Etching-derived Cr2CTx MXene for High-Performance Electromagnetic Wave Absorbers","authors":"Junyi Lv, Tao Li, Xuke Li, Hang Li, Shaowei Zhang, Haijun Zhang","doi":"10.1016/j.jallcom.2025.184239","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184239","url":null,"abstract":"Conventional methods for synthesizing Cr₂AlC MAX phase powders often suffer from long processing times, limited purity, and poor scalability, which hinder their application in electromagnetic wave (EMW) absorption at high temperatures. In this work, high-purity Cr₂AlC MAX phase powders (96.3<!-- --> <!-- -->wt%) were successfully synthesized <em>via</em> laser-induced self-propagating synthesis (LSS) using Cr₇C₃, Cr₃C₂ and Al powders as raw materials. Compared to conventional heating, this method greatly shortened the synthesis period by 10–240 times. The obtained Cr₂AlC powders showed excellent high-temperature EMW absorption performance. Even after oxidation at 973<!-- --> <!-- -->K for 3<!-- --> <!-- -->h, the absorber maintained strong absorption with a minimum reflection loss (<em>RL</em>_<em>min</em>) of −32.76<!-- --> <!-- -->dB at 2.1<!-- --> <!-- -->mm. Furthermore, Cr₂CT_x MXene prepared by selective HF etching of as-prepared Cr₂AlC exhibited good EMW absorption capacity, the Cr₂CT_x MXene before and after shear exfoliation respectively reached <em>RL</em>_<em>min</em> values of −19.59<!-- --> <!-- -->dB (at 13.34<!-- --> <!-- -->GHz) and −17.96<!-- --> <!-- -->dB (at 14.71<!-- --> <!-- -->GHz) with effective absorption bandwidth of 2.91<!-- --> <!-- -->GHz and 3.57<!-- --> <!-- -->GHz. These results demonstrate the promising potential of as-prepared Cr₂AlC and its MXene derivative for high-performance high-temperature EMW absorption applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"79 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235062","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":"Dynamic magnetization resonance enhancement of Co-based soft magnetic thin films induced by two-step oblique angle deposition","authors":"Zenan Ma, Tao Wu, Qifan Li, Ke Sun, Chuanjian Wu, Xiaona Jiang, Zhong Yu, Zhongwen Lan","doi":"10.1016/j.jallcom.2025.184227","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184227","url":null,"abstract":"Oblique angle deposition is an effective strategy to enhance the resonance frequency of magnetic thin films, but it often suffers from increased surface roughness, high damping, and reduced permeability, which limit their use in GHz integrated inductors. Here, we propose a two-step oblique angle deposition method to address this trade-off. At the optimal deposition angle of 30°, Co₉₀Nb₁₀ films exhibit an initial permeability of 404, a resonance frequency of 2.87<!-- --> <!-- -->GHz, and a damping factor of 0.0062. These improvements are attributed to reduced roughness, suppressed dipolar interactions, and the promotion of nucleation-type domain reversal. When used as magnetic cores in thin-film inductors, the inductance is enhanced by 160% compared with air-core devices. This study demonstrates that the two-step deposition strategy effectively reconciles the conventional conflict between permeability and resonance frequency, offering a promising approach for GHz-range silicon-integrated inductors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"32 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235065","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":"Stochastic domain nucleation across the insulator-metal transition of isolated VO2 nanoparticles","authors":"P.K. Ojha, G. Nemeth, D. Nair, P. Kumar, R. Banerjee, F. Borondics, S.K. Mishra","doi":"10.1016/j.jallcom.2025.184190","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184190","url":null,"abstract":"Vanadium dioxide (VO₂) has emerged as one of the most studied smart optical materials due to its reversible insulator-metal transition (IMT) that manifests morphology and size-dependent optical properties. Employing synchrotron-based nano-Fourier transform infrared spectroscopy (nano-FTIR) and scattering-type scanning near-field optical microscopy (s-SNOM), we report the IMT of isolated VO₂ nanoparticles (NPs). Thermal-induced random domain nucleation and metallization of V⁴⁺ (3d¹) correlated electrons in isolated VO₂ NPs are reported. Nano-FTIR as a function of temperature provides site-specific insights into VO₂ NPs by recording local amplitude and phase spectra that directly correlate the metallization of VO₂ NPs with their optical absorption characteristics. These spectra also indicate the phonon modes of the monoclinic phase of VO₂ (~680-750<!-- --> <!-- -->cm⁻¹) that establish the distinct characteristics of electron-phonon interaction. Temperature-dependent infrared nano-imaging of VO₂ NPs (55-250<!-- --> <!-- -->nm) reveals a different transition behaviour for individual NPs rather than an average transition temperature (T_c). The underlying microscopic mechanisms of the phase transition in VO₂ NPs and their size-dependent metallization are discussed within the framework of classical nucleation theory and a combined Peierls and Mott thermodynamic phenomenological model. The present observations offer profound implications for designing sensing devices based on these nanoscale elements.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"47 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145229308","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 permeability and reduced loss in FeSiAl soft magnetic composites via phosphating and ferrite coating","authors":"Meng Jin, Fan Zhao, Ming Liu","doi":"10.1016/j.jallcom.2025.184258","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184258","url":null,"abstract":"FeSiAl soft magnetic composites (SMCs) are promising candidates for high-frequency power electronics in 5<!-- --> <!-- -->G communication and electric vehicles, but their performance is limited by brittle phosphate coatings and difficulties in ferrite integration. In this work, we systematically optimized phosphating concentration and explored two Ni-Zn ferrite coating strategies. Gradient experiments identified 0.2<!-- --> <!-- -->wt% phosphating as optimal. The physically blended ferrite coating exhibited superior performance compared to the in-situ chemical method, delivering high permeability (<em>μ</em>ₑ≈180), excellent frequency stability (Δ<em>μ</em>&lt;5% in 10 kHz–1<!-- --> <!-- -->MHz) and low power loss (165.26<!-- --> <!-- -->mW/cm³ @50<!-- --> <!-- -->kHz, 100 mT). Microstructural and magnetic characterizations, together with loss separation analysis, confirmed that the improvements originated from preserved insulation integrity and suppressed eddy currents. This study provides a scalable route for developing high-performance FeSiAl SMCs for next-generation power electronics.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"8 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235007","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":"Engineering Charge Transfer Pathways in Photocatalysis: A Comprehensive Review of Z-, S-, R-, and C-scheme Mechanisms","authors":"Ch. Venkata Reddy, Mule Vijayalakshmi, Narendra Bandaru, Bai Cheolho, Jaesool Shim","doi":"10.1016/j.jallcom.2025.184244","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184244","url":null,"abstract":"Photocatalysis is a promising strategy for sustainable energy conversion, yet its large-scale deployment is constrained by persistent challenges in charge generation, separation, and utilization. Recent advances in interfacial design have led to four distinct charge-transfer architectures, namely Z-, S-, R-, and C-schemes that reshape how electrons and holes migrate, interact, and drive redox reactions. Each scheme provides unique benefits: Z-schemes retain strong redox ability through selective recombination, S-schemes exploit internal electric fields for directional carrier flow, R-schemes utilize donor–acceptor frameworks for controlled charge migration, and C-schemes accumulate charges to enable multi-electron processes. Therefore, this review critically evaluates these architectures, highlighting both their mechanistic principles and trade-offs in efficiency, cost, and durability. Special attention is given to heterojunctions based on metal–metal oxides/metal-metal oxide and their integration with carbonaceous materials, which enhance interfacial charge dynamics, broaden light absorption, and improve structural robustness. While Z- and S-schemes are relatively mature and experimentally validated, R- and C-schemes remain at an early stage but show strong potential for selective and complex catalytic processes. Future directions are outlined for designing efficient, stable, and scalable photocatalytic systems aligned with sustainable energy goals.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"26 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235009","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":"Investigation of Impact of Antimony (Sb) Nanoparticles Incorporation on Structural, Dielectric, and Electrical Properties of Se76-xGe14As10Sbx (x = 0, 3, 6, 9, and 12) Glasses","authors":"Vijay Pratap, Surya Pratap, Devanand Gupta, Horesh Kumar","doi":"10.1016/j.jallcom.2025.184259","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184259","url":null,"abstract":"Chalcogenide glasses of composition Se_76-xGe₁₄As₁₀Sb_x (x = 0, 3, 6, 9, and 12%) were prepared, using Sb nanoparticles, by traditional melt quenching procedure. Structural analysis reveals Sb forms bonds with Se at lower atm.%, however, at higher atm.%, other heteropolar bonds also formed. Their dielectric properties and a.c. conductivity were studied in 20.20 – 1010.10<!-- --> <!-- -->kHz and 300 – 345<!-- --> <!-- -->K, respectively. A temperature and frequency dependence of the dielectric constant was observed, indicating orientation polarization in the system. Dielectric constant increases with incorporation of Sb nanoparticles. However, a slight decrease is noticed for x = 12. The variations in dielectric loss with temperature and frequency were explained by polaron hopping of charge carriers and conduction loss, as per the Elliot and Shimakawa hypothesis. The a.c. conductivity was found to be ~ 10^-4 (Ω-m)^-1 for prepared alloys. The conduction mechanism shows a change from Correlated Barrier Hopping (CBH) to the Non-Overlapping Polaron Tunneling (NSPT) at a particular temperature for all the alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"108 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235064","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":"Core-Shell n-SnO2@p-SnO Heterojunctions via On-Chip Annealing for Ultrasensitive H2S Detection at Room Temperature","authors":"Jiao Xu, Jiajun Feng, Junjiang Ye, Guanghai Shi, Peng Lin, Teng Yun, Sudong Wu, Xujin Wang, Dengji Guo, Aihua Zhong","doi":"10.1016/j.jallcom.2025.184217","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184217","url":null,"abstract":"Conventional SnO₂-based gas sensors often suffer from high operating temperatures, excessive energy consumption, and dependence on noble metal catalysts. Here, we report a core-shell <em>n</em>-SnO₂@<em>p</em>-SnO heterojunction-based gas sensor, fabricated through a facile on-chip rapid annealing process of hydrothermally synthesized <em>p</em>-SnO nanoflakes drop-cast onto Ti/Au electrode-coated <em>p</em>-Si wafers, enabling efficient room-temperature H₂S detection. Under optimized on-chip annealing conditions, the <em>p</em>-SnO nanoflakes become encapsulated by compact layers of <em>n-</em>SnO₂ nanospheres (≈5–15<!-- --> <!-- -->nm in diameter), forming a core-shell <em>p-n</em> heterostructure. This architecture induces synchronized modulations of the depletion layer thickness and space charge region width upon H₂S exposure, yielding a significantly enhanced response compared to conventional SnO₂/SnO composites. Furthermore, interactions between H₂S and hydrolysis products of adsorbed H₂O molecules release additional electrons, leading to humidity-enhanced sensing performance across a relative humidity range of 20–60%. The optimized sensor operates with excellent selectivity and stability at room temperature, achieving an ultrafast response time of 1<!-- --> <!-- -->s — an unprecedented speed among SnO₂-based H₂S sensors — a high response magnitude of 66.7 toward 30 ppm H₂S, with a calculated detection limit of 0.85 ppm. Overall, this work demonstrates a novel, low-cost route for fabricating high-quality SnO₂@SnO heterojunctions and offers a promising pathway toward the development of high-performance room-temperature H₂S gas sensors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"27 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235070","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":"Crystallization effect in the self-bias response of several Fe-rich magnetoelastic alloys","authors":"Ana Catarina Lopes, J. Gutiérrez, A. García-Arribas, A. Aginagalde, A. Ayerdi, I. Quintana, J.L. Vilas, J.S. Garitaonandia, A. Lasheras","doi":"10.1016/j.jallcom.2025.184229","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184229","url":null,"abstract":"This work investigates the self-bias effect in thermally annealed Fe-based magnetoelastic sensors, extending previous findings on Vitrovac® 7600 to compositions designed for enhanced corrosion resistance. The alloys FeNiCrSiB, FeCoSiB, and Metglas were selected to evaluate the influence of annealing-induced crystallization on their magnetic, magnetoelastic, structural, and electrochemical properties, with a focus on their suitability for operation in harsh environments. The results reveal that thermal treatment at 500 °C resulted in partial crystallization, as confirmed by X-ray diffraction and Mössbauer spectroscopy, yielding a dual-phase structure composed of crystalline and amorphous regions. In addition, all treated samples exhibited stable and clearly detectable self-bias magnetoelastic resonances after one month, as well as significant improvements in quality factor (up to 1050 for the FeCoSiB alloy) and frequency stability over time (maximum deviation down to 6 and 12<!-- --> <!-- -->Hz for the Metglas and FeCoSiB sensors, respectively). Further, while thermal annealing adversely affected the corrosion resistance of V7600 and FeCoSiB (increase in the corrosion rate of 76% and 660%, respectively), it preserved the stability of Metglas and substantially improved the performance of FeNiCrSiB (55% reduction in corrosion rate). These results highlight the potential of Cr- and Ni-enriched Fe-based alloys as suitable candidates for self-bias magnetoelastic sensor platforms to be employed in harsh environments.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"108 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235002","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":"Enhancement of Photothermoelectric Performance of TiO₂ Promoted by the Seebeck Effect","authors":"Meina Meng, Jun Wang, Huijun Kang","doi":"10.1016/j.jallcom.2025.184206","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.184206","url":null,"abstract":"Photothermoelectric (PTE) materials interconvert light, heat, and electrical energy, showing significant potential for applications in the fields of energy, healthcare, and intelligent sensing. However, the research on PTE properties is still in its infancy. In particular, there are relatively few PTE materials operating in the visible light band. In this study, we investigated the photothermoelectric effect of rutile-phase Ti_1-<em>x</em>Nb_<em>x</em>O₂ bulk materials with varying Nb doping concentrations (<em>x</em> = 0.01, 0.05, 0.14, 0.20) in the visible light band. By tuning the band structure and Seebeck coefficient (<em>S</em>), the PTE effect was achieved within the 635<!-- --> <!-- -->nm visible light band. Nb doping effectively modulated light absorption, carrier transport, and thermoelectric properties. As the Nb content increases, the absorptance at 635<!-- --> <!-- -->nm rises from 43% for Ti_0.99Nb_0.01O₂ to 53% for Ti_0.8Nb_0.2O₂. However, the variation of the photothermoelectric voltage (<em>U</em>_<em>PTE</em>) is consistent with that of the Seebeck coefficient. Under 0.9<!-- --> <!-- -->mW laser irradiation, the <em>U</em>_<em>PTE</em> first decreases from 20.23 μV for Ti_0.99Nb_0.01O₂, reaches a minimum of 17.05 μV for Ti_0.86Nb_0.14O₂, and then increases to 17.24 μV for Ti_0.8Nb_0.2O₂. Due to its small band gap (<em>E</em>_<em>g</em><em>)</em>, Ti_0.86Nb_0.14O₂ demonstrated the lowest resistance (<em>R</em>), with its Photothermoelectric power (<em>P</em>_<em>PTE</em>) being 3.2 times that of Ti_0.8Nb_0.2O₂ under 0.9<!-- --> <!-- -->mW illumination. Additionally, Nb doping significantly reduces the thermal conductivity (<em>κ</em>), with Ti_0.8Nb_0.2O₂’s <em>κ</em> dropping to 1.7<!-- --> <!-- -->W·m^-1K^-1. This study not only provides a novel approach for the design of PTE materials in the visible light range but also promotes the development of self-powered sensors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"32 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145235005","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}