Journal of Alloys and Compounds最新文献

{"title":"Processing and microstructure of bioresorbable Zn/Mg multi-materials manufactured by additive friction stir deposition","authors":"Yidi Li, Biaobiao Yang, Juan Guillermo Santos Macías, Hui Wang, Yunping Li, Javier Llorca","doi":"10.1016/j.jallcom.2025.181342","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181342","url":null,"abstract":"This work explores the development of novel Zn/Mg multi-materials for biomedical applications by leveraging the complementary properties of Mg (bone-matching elastic modulus, rapid degradation) and Zn (moderate strength, slower degradation rate). Additive friction stir deposition, a solid-state manufacturing process, is used to manufacture Zn/Mg multi-materials. Microstructural analysis reveals a well-defined three-layer interface structure consisting of a mixture of Mg + MgZn, nm-sized grains of MgZn₂, and nm-sized grains of Mg₂Zn₁₁ phases from the Mg side to the Zn side. The interface region was fully dense, free of cracks, and showed substantial capability of plastic accommodation which was able to relieve stress concentrations through different mechanisms. These findings highlight the potential of additive friction stir deposition to control the thickness and structure of the Zn/Mg interface and pave the way for the manufacturing of Zn/Mg multi-material components for biomedical applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188954","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":"Spectral Studies of Eu3+-Activated Na2Zn5Mo6O24: a Novel Red-Emitting Nanophosphor with High Quantum Efficiency and Thermal Stability","authors":"Yanlin Huang, Cong Xiang, Rui Xu, Jingyi Fang, Hyun Kyoung Yang","doi":"10.1016/j.jallcom.2025.181331","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181331","url":null,"abstract":"This study investigates the development of a novel red-emitting nanophosphor, Eu³⁺-doped Na₂Zn₅Mo₆O₂₄, synthesized via a sol-gel method for optoelectronic applications. Eu³⁺ ions, known for the red luminescence via ⁵D₀ → ⁷F₂ hypersensitive transition (~615<!-- --> <!-- -->nm), face intrinsic limitations due to weak oscillation absorption in the UV to blue spectral range. To solve this problem, the effective excitation of Eu³⁺ ions in the near-ultraviolet wavelength range was achieved by using the molybdate host Na₂Zn₅Mo₆O₂₄. Structural analysis confirmed a triclinic phase (space group P-1) with phase purity across doping concentrations (x = 0.01–0.06). The nanophosphor exhibited intense red emission (CIE: 0.65, 0.34) under 395<!-- --> <!-- -->nm excitation, with a quantum efficiency (QE) of 68.5% and superior thermal stability (activation energy ΔE = 0.279<!-- --> <!-- -->eV). Optimal performance was observed at <em>x</em> = 0.05, balancing radiative efficiency and concentration quenching. Prototype LEDs integrating the nanophosphor demonstrated high color purity, and a warm-white LED achieved a color rendering index (CRI) of 90, validating its potential for solid-state lighting.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"6 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188949","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":"The Effect of Si Content on the Microstructure and Thermal Conductivity of Al-XSi-3Cu-5Mg Alloys Produced by Laser Additive Manufacturing","authors":"Yang Li, Shouren Wang, Zhen Xiao, Mingyang Du, Zhuang Zhang, Mengjun Liu, Peining Li","doi":"10.1016/j.jallcom.2025.181341","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181341","url":null,"abstract":"High-silicon aluminum alloys are widely utilized in heat dissipation devices due to their outstanding thermophysical properties and represent a major focus in thermal management research. The incorporation of silicon imparts numerous beneficial attributes to the alloy; however, an excessive amount of silicon may result in a decline in thermal conductivity. To investigate the optimal silicon content within the alloy system, this study employed laser additive manufacturing to fabricate Al-Si-3Cu-5Mg alloys with varying silicon concentrations. Comprehensive microstructural characterization was conducted, alongside systematic evaluations of wear resistance and thermal performance. The results demonstrate that as the silicon content increases, hardness rises progressively from 134 HV to 326 HV, the friction coefficient decreases from 0.5 to approximately 0.22, and wear resistance is significantly enhanced. Meanwhile, thermal conductivity exhibits a linear decreasing trend, dropping from 227<!-- --> <!-- -->W/(m·K) to around 140<!-- --> <!-- -->W/(m·K), and shows an inverse relationship with the coefficient of thermal expansion. These phenomena are attributed to the complex interactions between silicon and the added copper and magnesium elements during the additive manufacturing process. This study provides valuable insights for optimizing alloy compositions to improve the efficiency of heat sinks in industrial applications. Furthermore, a mathematical model for calculating thermal conductivity is developed, and a thorough comparison with experimentally measured values indicates that the model offers a satisfactory interpretation of the experimental outcomes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"26 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188925","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":"Preparation of Nd-reinforced N-doped Cu7S4 rich in sulfur vacancies for supercapacitors","authors":"Haifei Wang, Wenpeng Han, Fang Tian, Decui Yao, Shuzhen Liu, Jiaxin Wu, Hui Li, Jiatian Cao, Hanzhe Zheng, Xiaoyang Liu","doi":"10.1016/j.jallcom.2025.181321","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181321","url":null,"abstract":"Introducing sulfur vacancies in transition metal sulfide-based electrode materials is an effective way to improve the electrochemical energy storage of the materials. Nd-reinforced N-doped Cu₇S₄ (Nd@N-Cu₇S₄) composite material, supported on nickel foam (NF), is synthesized by regulating the doping of Nd into the N-doped Cu₇S₄ materials. Regulating on the number of doped Nd atoms can change the concentration of sulfur vacancies produced in the N-doped Cu₇S₄ material. After introducing sulfur vacancies, the diffusion rate of ions and the number of reactive sites in the material are enhanced by altering the distribution of local electron concentrations around the sulfur vacancies during the electrochemical reaction process. This increases and improves the electrochemical energy storage of the Nd@N-Cu₇S₄ material. Theoretical calculations are carried out to study the influence of the generation of sulfur vacancies on the material structure. The Nd-reinforced N-doped Cu₇S₄ (Nd@N-Cu₇S₄) composite electrode exhibits a higher energy storage capacity than existing copper sulfide-based electrode materials and other ion-doped sulfides. To further investigate the practical application of Nd@N-Cu₇S₄/NF, a liquid-phase supercapacitor is constructed featuring a wide operational potential window of 1.8<!-- --> <!-- -->V. This device utilizes Nd@N-Cu₇S₄/NF as the negative electrode and Nd@N-Cu₇S₄/CF (carbon felt) as the positive electrode, with 1<!-- --> <!-- -->M NaOH serving as the electrolyte. The assembled supercapacitor demonstrates high energy density, emphasizing the potential of the Nd@N-Cu₇S₄/NF electrode in high-performance energy storage applications. These findings suggest that the Nd@N-Cu₇S₄/NF composite is a promising candidate for advancing the development of next-generation supercapacitors.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"52 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188951","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":"Reduction of Ilmenite and Preparation of Titanium-Based Carbides in the CH4-H2 System","authors":"Tingting Lv, Jianwei Song, Yunfei An, Tu Hu, Guo Lin","doi":"10.1016/j.jallcom.2025.181315","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181315","url":null,"abstract":"Titanium carbide, which exhibits extensive applications across diverse fields, is the focus of this study on its synthesis from low-grade ilmenite in the CH₄-H₂ system. Taking the reduction temperature range of 1100 °C to 1350 °C as a starting point, a distinct \"M\"-shaped relationship between temperature and the carburizing rate is observed. Metallic iron is recognized as a crucial factor influencing the synthesis of titanium-based carbides from ilmenite, with its accumulation closely linked to the carburizing rate of the reduction products. At 1100 °C -1200 °C, increasing the temperature promotes the aggregation and growth of iron, resulting in an increased carburizing rate of the products. At 1225 °C -1300 °C, most of the metal iron dissolved carbon and transformed into molten state. As the temperature increases, the fluidity of the molten iron improves, allowing it to accumulate and grow, thereby reopening the pores in the matrix and rebounding the carburizing rate. At 1350 °C, the dripping of molten iron causes the pellets to soften and fall, leading to a sudden decrease in the product's carburizing rate. The morphological characteristics of reduced ilmenite pellets demonstrate that as the temperature increases, the wettability of metallic iron and carbide shifts from a non-wetting to a wetting. The reduced product-metallic iron-interconnects and aggregates the dispersed reduced ilmenite into a cohesive mass that encases the TiC_xO_1-x, which results in the incomplete carburization of the ilmenite. This study provides theoretical support for the preparation of carbides by gas-based reduction of ilmenite.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188926","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":"Synergistic effect of ultrasound-assisted and ZrO2 nanoparticle sealing on microstructure and mechanical properties of aluminum alloy micro-arc oxidation coating","authors":"Zhenhua Liu, Shuangshuang Zhi, Shubo Li, Zhiqiang Zhu, Ke Dai, Hailin Lu","doi":"10.1016/j.jallcom.2025.181338","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181338","url":null,"abstract":"The coating prepared by the conventional micro-arc oxidation (MAO) process usually has a porous structure, which cannot effectively block the invasion of corrosive media, thus reducing corrosion resistance and wear resistance. In this study, composite oxide coatings were prepared on 6061 aluminum alloy by using ultrasound-assisted MAO technology and adding ZrO₂ nanoparticles in phosphate solution. The microstructure and elemental composition of the coating were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS), and the wear resistance and corrosion resistance were tested. The results show that under the synergistic effect of ultrasonic assistance and nanoparticle sealing, the porosity of the composite coating is reduced from 6.35% of the traditional MAO coating to 2.85%, the corrosion current density is three orders of magnitude lower than that of the substrate, and it has excellent wear resistance and density. These properties effectively improve the service life of the metal.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"67 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188927","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":"Research Progress on Additive Manufacturing of Mn-Cu Damping Alloys","authors":"Conghui Ma, Kaibin Huang, Changjun Wang, Changyong Liu, Zhiyuan Liu, Zhangwei Chen","doi":"10.1016/j.jallcom.2025.181329","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181329","url":null,"abstract":"Mn-Cu alloys are recognized as a promising class of high-performance damping materials, distinguished by their exceptional damping capacity (internal friction up to 0.06 after aging) and superior mechanical strength (tensile strength exceeding 500<!-- --> <!-- -->MPa). The development of laser additive manufacturing technologies has revolutionized the fabrication of geometrically complex Mn-Cu alloy components, overcoming the limitations of conventional casting and powder metallurgy in structural design. Despite this progress, significant challenges remain, including Mn evaporation under high-energy laser irradiation and strict powder quality requirements related to particle morphology, flowability, and oxidation resistance. However, Mn is prone to volatility during laser exposure, significantly impacting the quality and performance of deposited parts. Recent studies have shown that surface modification using carbon-based additives (e.g., graphene, CNTs) can improve laser absorptivity by up to 30%, reduce porosity, and enhance powder consolidation during additive manufacturing process. This paper reviews recent research advancements in AM of Mn-Cu alloys, delineating the powder characteristic requirements and examining the influence of AM process parameters on the mechanical and damping properties of Mn-Cu alloys. It highlights quantitative improvements in microstructure and performance, and proposes future research directions focused on mitigating Mn loss, controlling twin morphology, and elucidating phase transformation mechanisms in AM-produced Mn-Cu alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"28 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188953","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 heat treatment on microstructure, phase transformation behavior and shape memory effect of NiTi shape memory alloy manufactured by additive manufacturing","authors":"Guangyi Ma, Jun Wang, Tengda Di, Yongqiang Fu, Zhuoxi Wang, Yunbo Hao, Fangyong Niu, Dongjiang Wu","doi":"10.1016/j.jallcom.2025.181340","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181340","url":null,"abstract":"NiTi shape memory alloy (SMA) components fabricated via additive manufacturing exhibit broad application prospects in biomedical and aerospace fields. However, directly additively manufactured NiTi SMAs often suffer from inhomogeneous phase distribution and unstable shape memory properties. Heat treatment can effectively homogenize phase distribution and enhance the stability of shape memory performance. In this study, aging treatments at varying durations and temperatures were conducted on NiTi SMAs produced by laser-directed energy deposition (L-DED) to achieve more stable and superior mechanical performance. The effects of different heat treatment regimes on microstructure evolution, elemental/phase distribution, and shape memory behavior were systematically investigated through experimental characterization and molecular dynamics (MD) simulations. Key findings include: Compared to as manufactured samples, aging at 400 °C to 600 °C minimally influenced NiTi₂ distribution but universally promoted an increase in phase transformation temperatures and transformation enthalpy, meanwhile, prolonged aging durations further elevated phase transformation temperatures. Aging at 500 °C and 600 °C facilitated a reduction of high angle grain boundaries in L-DED NiTi SMAs and enhanced shape memory effects, which MD simulations attributed to diminished grain boundary resistance to phase transformation. Aging at 500 °C and 600 °C also stimulated the precipitation of Ni₄Ti₃ phases, enabling matrix strengthening and improved shape memory performance, with extended aging times promoting precipitate coarsening. This work provides insights into optimizing aging treatments to stabilize and enhance the properties of L-DED NiTi SMAs, thereby advancing their broader industrial adoption.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"36 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188948","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":"New organic–inorganic bromides[(C3H7)4N]2MBr4 (M=Hg and Cd): Synthesis, crystal structure and vibrational characterization","authors":"M. Khalfa, A. Oueslati, K. Khirouni, M. Gargouri, S. Auguste, J.-F. Bardeau, G. Corbel","doi":"10.1016/j.jallcom.2025.181334","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181334","url":null,"abstract":"Two new quaternary ammonium mercury bromide and cadmium bromide crystals [(C₃H₇)₄N]₂HgBr₄ and [(C₃H₇)₄N]₂CdBr₄ have been synthesized by slow evaporation met hod at room temperature. Their crystal structure was determined at room temperature by single crystal X-ray diffraction. Both structures consist of three symmetrically inequivalent tetrapropylammonium cations and one discrete tetrahedral [MBr₄]^2- (M=Hg and Cd) anions. The compounds are isomorphous and crystalize in monoclinic system with <em>C 2/c</em> space group. The purity of each preparation was confirmed by X-ray powder diffraction measurements at room temperature. Internal vibration modes of both crystals have been studied at room temperature using Raman spectroscopy. The structural phase transitions in [(C₃H₇)₄N]₂HgBr₄ and [(C₃H₇)₄N]₂CdBr₄ are studied by differential scanning calorimetry (DSC) and two reversible structural phase transitions are detected at 341/330<!-- --> <!-- -->K and 402/375<!-- --> <!-- -->K for [(C₃H₇)₄N]₂HgBr₄ and at 345/333<!-- --> <!-- -->K and 404/377<!-- --> <!-- -->K for [(C₃H₇)₄N]₂CdBr₄ on heating/cooling process. Electrical measurements showed that both compounds were good semiconductors. The thermal evolution of their conductivity shows two regime changes at the temperatures at which structural transitions occur. The thermal evolution of the dielectric constant shows that the second phase transition for the [(C₃H₇)₄N]₂CdBr₄ compound is ferroelectric in nature.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"16 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188952","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":"L-ascorbic acid coupled graphene double carbon coating enhances the electrochemical properties of Na3V2(PO4)3 cathode materials","authors":"Lan Jiayi, Liao Juan, Wen Fengchun, Gan Linfeng, Hu Lei, Jiang Qi","doi":"10.1016/j.jallcom.2025.181311","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.181311","url":null,"abstract":"Sodium vanadium phosphate (NVP) cathode material is highly regarded for its low cost and high current charge-discharge capabilities. However, its poor cycle performance hinders its application. In this paper, the carbon coating NVP is studied with L-Ascorbic acid (KC) as a carbon source, and the double carbon coating design is realized with reduced graphene oxide(rGO) to improve its electrochemical performance. The obtained materials are characterized by XRD, Raman, BET, XPS, SEM, EDS and TEM. The electrochemical performance of the samples is characterized by assembling into batteries. The results show that the amount of ascorbate can greatly affect the electrochemical performance of the electrode material. When n_V:n_C=1:4.5, the obtained composite NVP@C_KC-4.5 has the best electrochemical performance. The initial specific discharge capacity is up to 109.8 mAh·g^-1 at 0.1<!-- --> <!-- -->C. And its capacity retention rate after 100 cycles at 0.5<!-- --> <!-- -->C rate is about 94.5%. On this basis, graphene (in the form of graphene oxide) is introduced. When the amount of graphene oxide is 0.6% of the total weight, the obtained NVP@C_KC-4.5@rGO-3 composite has the best electrochemical performance. Its half battery charge and discharge rate, its initial discharge capacity increases to 115.4 mAh·g^-1 at 0.1<!-- --> <!-- -->C, and its capacity retention rate is up to 95.2% at 0.5<!-- --> <!-- -->C after 100 cycles, showing good electrochemical performance.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"12 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-05-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144188831","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}