Journal of Alloys and Compounds最新文献

{"title":"A novel 410 nm excitable Y3Ga3MgSiO12: Ni2+ garnet phosphor for ultra-wide broadband emission toward NIR III region and its application","authors":"Qian Zhang ,&nbsp;Sihan Feng ,&nbsp;Xuyan Xue ,&nbsp;Qi Zhu ,&nbsp;Xuejiao Wang ,&nbsp;Ji-Guang Li","doi":"10.1016/j.jallcom.2025.180089","DOIUrl":"10.1016/j.jallcom.2025.180089","url":null,"abstract":"<div><div>The performance of near-infrared phosphor-converted light-emitting diodes (NIR pc-LEDs) is largely determined by the applied NIR-emitting phosphors. Phosphors activated by Ni²⁺ show promising luminescence in the NIR-II region but are commonly excited by 365 nm ultraviolet chips. Although Cr³⁺-Ni²⁺ co-doped materials can be efficiently excited by blue chips, this approach imposes strict lattice requirements and necessitates the simultaneous incorporation of both Cr³⁺ and Ni²⁺ ions into the lattice structure. In this study, we present a novel Ni²⁺-activated garnet phosphor, Y₃Ga₃MgSiO₁₂: Ni²⁺ which can be excited by 410 nm light. The Ni²⁺ ions are located in the octahedral sites of [MgO₆] and [Ga₁O₆]. Two significant advancements are made in the Y₃Ga₃MgSiO₁₂: Ni²⁺ phosphors: One is the shift of the ideal excitation wavelength from UV to 410 nm, which can greatly reduce the damage of ultraviolet light to the encapsulated pc-LED and the phosphor. The second is the realization of ultra-wideband and continuous emission of NIR-II-III region (1000–1850 nm, full width at half maximum of 314 nm). The optimal excitation wavelength is identified as 406 nm, and a prominent NIR emission at 1470 nm is achieved. Compared with the Y₃Ga₅O₁₂, the luminescence intensity was 4.5 times enhanced after Mg²⁺/Si⁴⁺ substitution. The effect of Mg²⁺/Si⁴⁺ substitution on the luminescence properties is systematically elucidated. The Y₃Ga₃MgSiO₁₂: 0.03 Ni²⁺ phosphor, when coupled with commercially available 410 nm blue light chips, demonstrates the promising potential for applications in NIR pc-LEDs and night vision. This work paves the way for the future development of highly efficient, ultra-wideband near-infrared emitting phosphors.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180089"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758227","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":"In-situ investigation of phase transformations in Ti-Nb-Zr alloys by simultaneous synchrotron diffraction and dilatometry","authors":"Kleanny Gama Sales de Souza, Karen Pantleon, Flemming Bjerg Grumsen, Rubens Caram, Matteo Villa","doi":"10.1016/j.jallcom.2025.180199","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180199","url":null,"abstract":"Ti-Nb-Zr alloys are promising materials for structural applications in the biomedical sector. Unfortunately, detailed understanding of the solid-state transformations occurring in these alloys is lacking, in particular concerning the diffusionless processes linked to the formation of ω phase. In this work we applied simultaneous <em>in-situ</em> synchrotron diffraction and dilatometry to study phase transformations in three Ti-Nb-Zr alloys containing 20, 27 and 35<!-- --> <!-- -->wt.% Nb, respectively, and fixed 13<!-- --> <!-- -->wt.% Zr. The applied thermal cycle consisted in heating to 850 °C followed by cooling to room temperature, applying a high heating and cooling rate of 30<!-- --> <!-- -->°C/s to suppress diffusional phenomena. The investigation showed no transformation in the alloy richer in Nb, which is classified as β alloy, and the occurrence of three phenomena in the other two alloys: i) the reversion of α'' martensite to β phase on heating, followed by the β→α'' martensitic transformation on cooling; ii) the ω to β transformation on heating, followed by ω formation on cooling; iii) an anomalous expansion of the β lattice on heating, followed by an anomalous contraction on cooling that is also interpreted in terms of ω↔β transformation. Finally, it is shown that all these transformations can be followed by dilatometry, paving the way to systematic investigation of transformations in similar alloys in the future.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"216 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758229","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":"Deterioration mechanism of impact toughness in the coarse-grained heat-affected zone of Ca-treated shipbuilding steel plate with high-Cr content","authors":"Tingting Li, Jian Yang, Yinhui Zhang, Han Sun, Pengfei Hu, XU Longyun","doi":"10.1016/j.jallcom.2025.180194","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180194","url":null,"abstract":"The deterioration mechanism of low-temperature toughness in the coarse-grained heat-affected zone (CGHAZ) of shipbuilding steel plates with Ca-treatment, induced by the addition of Cr, was systematically investigated. Through a combination of experimental research and theoretical calculations, the effects of Cr content (ranging from 0.019 to 0.17<!-- --> <!-- -->wt%) on microstructural evolution, M₃C carbide formation, fracture morphology, and low-temperature impact toughness in the CGHAZ were evaluated. The mechanisms responsible for the decline in impact toughness in 170Cr (ω_Cr=0.17<!-- --> <!-- -->wt%) steel have been clarified. Thermodynamic calculations and <em>in situ</em> observations reveal that increasing Cr content reduces the C diffusion coefficient and the austenite-to-ferrite (γ→α) phase transformation temperature. Consequently, there is a decrease in the content of intragranular acicular ferrite (IAF) and an increase in the formation of brittle microstructures within the CGHAZ. It is effectively interpreted by first-principle calculations that the formation energy of M₃C carbides is reduced when Fe atoms in Fe₃C are replaced by Cr. The formation energy of Fe₃C (−0.0487<!-- --> <!-- -->eV/atom) is greater than that of (Fe, Cr)₃C (−0.1048 or −0.1111<!-- --> <!-- -->eV/atom), indicating that the M₃C type carbides are easier to form in 170Cr steel. In 170Cr steel, strip M₃C carbides are prone to forming at sub-grain boundaries, weakening the bonding force between sub-grains and making these boundaries more susceptible to crack propagation. Besides, the reduction in the variety of bainite variants decreases the content of high-angle grain boundaries (HAGBs) in bainites, further reducing the crack propagation resistance of 170Cr steel. Furthermore, the increasing C supersaturation in the ferrite of 170Cr steel reduces the plasticity of the CGHAZ, thereby reducing crack initiation energy. In conclusion, the addition of Cr results in a decrease in the low-temperature impact toughness of CGHAZ. As the Cr content increases from 0.019<!-- --> <!-- -->wt% to 0.17<!-- --> <!-- -->wt%, the low-temperature impact toughness at −40°C declines from 226<!-- --> <!-- -->J to 121<!-- --> <!-- -->J.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"38 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758642","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":"Structural characterization and selected properties of newly-developed Al-Cr-Pd and Al-Fe-Pd alloys with structurally complex intermetallics","authors":"Katarzyna Młynarek-Żak, Krzysztof Matus, Tymon Warski, Terezie Košová Altnerová, Tomáš Prošek, Rafał Babilas","doi":"10.1016/j.jallcom.2025.180177","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180177","url":null,"abstract":"In this work, the structure and selected properties of newly developed Al-Cr-Pd (72<!-- --> <!-- -->at.% of Al, 24<!-- --> <!-- -->at.% of Cr, 4<!-- --> <!-- -->at.% of Pd) and Al-Fe-Pd (72<!-- --> <!-- -->at.% of Al, 24<!-- --> <!-- -->at.% of Fe, 4<!-- --> <!-- -->at.% of Pd) alloys in the form of ingots were characterized. The structure of the alloys was described on X-ray diffraction, transmission electron microscopy, and scanning electron microscopy studies. The Al-Cr-Pd and Al-Fe-Pd alloys were examined for thermal properties (differential thermal analysis), corrosion resistance (electrochemical and scanning Kelvin probe force microscopy studies), and mechanical properties (Vickers hardness and wear resistance). Both alloys were characterized by a multiphase structure with the structurally complex intermetallics. The presence of decagonal electron diffraction (D-AlPdCr) for the Al-Cr-Pd alloy was confirmed by transmission electron microscopy. The Al-Cr-Pd alloy showed a higher tendency to passivate than the Al-Fe-Pd alloy in the 3.5% NaCl solution environment. However, the oxide layer on Al-Cr-Pd was discontinuous and less protective against further corrosion progression, as indicated by the higher corrosion current density for this alloy. For both alloys, a high contrast of Volta potentials was identified between the phases with and without palladium, which may favour the formation of galvanic microcells. The Al-Fe-Pd alloy showed a higher average hardness and a greater resistance to wear than the Al-Cr-Pd alloy.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"8 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766596","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":"High stability self-powered Bi2O3 based ultraviolet photodetector with p-i-n heterojunction","authors":"Chengbo Lang,&nbsp;Xingyuan Yu,&nbsp;Hua Tang,&nbsp;Jiang Cheng,&nbsp;Xiang Meng,&nbsp;Xihao Chen,&nbsp;Meijing Chen,&nbsp;Junjun Li,&nbsp;Lu Li","doi":"10.1016/j.jallcom.2025.180208","DOIUrl":"10.1016/j.jallcom.2025.180208","url":null,"abstract":"<div><div>The ultraviolet photodetectors find wide application in both military and civilian fields. Numerous wide bandgap semiconductors have been successfully developed and Bi₂O₃ attracted much attention in recent years due to its high photoconductivity, air stability, eco-friendly, and low cost. In this study, a self-powered transparent ultraviolet photodetector with a p-i-n structure was developed, the performance of which is greatly enhanced compared to that of p-n structure. The photodetector with the structure of AgNWs/NiO/Bi₂O₃/TiO₂/ITO achieved a responsivity of 145 mA W⁻¹, a detectivity of 5.5 * 10¹⁰ Jones, and a high EQE of 71 % under 254 nm light illumination with 10 μW cm⁻² of light intensity, also coupled with fast rise time of ∼20.8 ms and decay time of ∼21.1 ms. The responsivity of the photodetectors exhibits less than 3 dB attenuation within 200 Hz, and less than 10 % deterioration in 30 days under an ambient environment. The effects of solution concentration, phase structure, morphology, and band alignment of the films on the detection properties, as well as the mechanism of Bi₂O₃ enhancing the photodetection properties are discussed. The photodetectors possessing p-i-n structure with Bi₂O₃ are self-powered, high reliable, which are beneficial for long service life in applications.</div></div>","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"1024 ","pages":"Article 180208"},"PeriodicalIF":5.8,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766592","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":"Grating patterns with high aspect ratios created on the surface of Pd-based metallic glass by thermal imprinting","authors":"Rui Yamada, Ninshu Ma, Hidemi Kato","doi":"10.1016/j.jallcom.2025.180001","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180001","url":null,"abstract":"The thermal imprinting of grating patterns (lines and spaces) with high aspect ratios (height-to-width ratio of the lines) on the surface of Pd42.5Cu30Ni7.5P20 metallic glass was investigated. The flow model suggested that sample’s temperature of 350 ℃ under the processing time just within the incubation time for crystallization will lead the fabrication of grating with the highest aspect ratio. The load-time curve obtained during imprinting showed that a significant decrease in the load originated from a decrease in the sample viscosity above the glass transition temperature. By minimizing the decrease in loading, a grating with a height of 37 ± 4.1 μm and a fully amorphous structure was produced. Among the metallic glass gratings for X-ray phase imaging, the grating fabricated in this study shows high aspect ratio of ~8.7. As a demonstration, the grating performance was investigated by constructing a simple diffraction apparatus, revealing that the positions of the experimentally observed diffraction spots were consistent with the calculated ones. The results suggested that it can be considered as potential for the grating of X-ray Talbot interferometer.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143766597","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":"Precise Emission Bandgap Engineering in Hybrid Perovskite: An ITC Approach","authors":"Md. Jahidul Islam, Mudassar Shahid, Md Aslam Uddin","doi":"10.1016/j.jallcom.2025.180114","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180114","url":null,"abstract":"Hybrid lead halide perovskites are promising next-generation materials for optoelectronic applications, including LEDs, lasers, photodetectors, and solar cells. This study focuses on precise photophysical characterization and synthesis optimization to achieve controlled emission band tuning. Using the inverse temperature crystallization (ITC) method, we addressed key synthesis challenges such as solvent-specific precursor solubility limitations. To improve PbCl₂ solubility in DMF, we prepared MACl:PbCl₂ solutions in DMSO at 140°C then diluted with DMF. Similarly, MAPbI₃ in GBL exhibited unique solvothermal behavior, favoring luminescent crystallization at 110°C. A systematic shift in the transmittance edge was observed, ranging from 780<!-- --> <!-- -->nm for MAPbI₃ to 549<!-- --> <!-- -->nm for MAPbBr₃ and 421<!-- --> <!-- -->nm for MAPbCl₃. Red-shifting from bright green (MAPbBr₃) to blood-red (MAPbBr₁.₅I₁.₅, 650<!-- --> <!-- -->nm) was achieved, with intermediate Br:I compositions yielding yellow (590<!-- --> <!-- -->nm) and orange (605<!-- --> <!-- -->nm) emissions. Similarly, varying Br:Cl ratios resulted in tunable blue emissions from deep blue (441<!-- --> <!-- -->nm) to cyanine (490<!-- --> <!-- -->nm). A major challenge in hybrid perovskite photophysical characterization is phase segregation under UV excitation, leading to dual-color emission. To mitigate this, we employed controlled excitation light intensity, low-temperature measurements, two-photon absorption, and pulsed laser excitation. A scanning-mode measurement approach further enhanced emission accuracy. This study advances hybrid perovskite research by refining emission band fine-tuning methodologies, providing critical insights for the development of high-performance optoelectronic devices.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"32 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758233","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":"Environment-Friendly and Highly Efficiency Organic Antimony Halide Scintillator for Light Emitting Diode and X-ray Imaging","authors":"Yijia Wang, Sijun Cao, Jun’an Lai, Kang An, Daofu Wu, Jinquan Chen, Haimen Mu, Zixian Wang, Linfeng Guo, Peng He, Xiaosheng Tang","doi":"10.1016/j.jallcom.2025.180205","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180205","url":null,"abstract":"Metal halides with high luminescence properties have emerged as novel candidate scintillators for X-ray detection and imaging. Low-dimensional organic-inorganic halide, which consists of heavy metals with a free composition, provides unique optical properties and luminescence applications. Herein, a lead-free zero-dimensional antimony hybrid single crystal-(MPP)₂SbCl₅ (MPP = Methyltriphenylphosphonium) is developed through facile synthesis with nearly 100% photoluminescence quantum yield peaking at 590<!-- --> <!-- -->nm. The (MPP)₂SbCl₅ single crystal exhibits fantastic thermal stability with a phase transition temperature of 600<!-- --> <!-- -->K and air stability with exposure to air for at least 6 months. Moreover, single crystals with a product yield of 100% are prepared by an environment-friendly method that is devoid of any toxic solvents and pollution throughout the process. A light-emitting diode device using broad-band emissive single crystal (MPP)₂SbCl₅, green emission—MPP₂MnCl₄, and blue emission—anthracene on a 365<!-- --> <!-- -->nm GaN chip exhibits a pure white light (color rendering index, CRI = 93). Meanwhile, (MPP)₂SbCl₅ single crystal exhibits excellent scintillation performance, with a high light yield of 28000 photon MeV^-1 and a low detection limit of 532 nGy s^-1. The flexible scintillation screen based on (MPP)₂SbCl₅ was fabricated using the vacuum filtration method, displaying a spatial resolution of 18.4 lp mm^-1, which shows great potential for use in X-ray imaging. In addition, a 3D visual computed tomography (CT) image of a conch was successfully reconstructed, which indicates the fantastic potential of environment-friendly (MPP)₂SbCl₅ in optoelectronic detection applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758228","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":"Constructing oxygen-rich vacancies for efficient microwave absorption in Co3O4/C/N-doped carbon nanonets","authors":"Zhilei Hao, Shaoqi Shi, Baojun Wang, Pei Liu, Qingqing Gao, Kai Xu, Yinxu Ni, Zhaoxia Tian, Wei Xiao, Changtian Zhu, Gaojie Xu, Hui Zhang, Fenghua Liu","doi":"10.1016/j.jallcom.2025.180206","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180206","url":null,"abstract":"With the escalating severity of electromagnetic pollution, there arises an urgent necessity to exploit microwave absorption (MA) materials. Vacancy engineering has been demonstrated to be successful approaches of developing high-performance absorbers. The Co₃O₄/C/N-doped carbon nanonets (NCNs) hierarchical composites was synthesized by utilizing 3D NCNs as the conductive matrix and flower-shaped Co-MOF derivatives as the impedance modulator in this work. The three-dimensional conductive network of NCNs facilitates the transfer and hopping of free electrons, significantly elevating the conductive loss. By modulating the pyrolysis temperature, MOF derivatives construct continuous cavity boundaries that promote multiple reflections and scattering of electromagnetic wave (EMW), while simultaneously introducing oxygen-rich vacancies to enhance polarization effects and conductivity. When the pyrolysis temperature was 350 ℃, by the successful establishment of oxygen vacancies, the NCM-350 achieved an exceptional reflection loss of -78.1<!-- --> <!-- -->dB at 2.38<!-- --> <!-- -->mm. This investigation introduces an approach for the adjustable MA property of absorbers, offering a viable technique to enhance dielectric loss while maintaining a balance between polarization loss and conduction loss.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"75 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758230","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":"Phase precipitation behavior and mechanical properties of TiVNbTaAlx refractory high-entropy alloys after annealing at medium temperatures","authors":"Yan Long, You Lou, Kebo Liao, Zhaolin Jiang, Dezhi Zhu","doi":"10.1016/j.jallcom.2025.180099","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180099","url":null,"abstract":"The thermal stability of the microstructure and the associated changes in mechanical properties are critical factors for the high-temperature performance of refractory high-entropy alloys (RHEAs). In this study, we fabricated a series of TiVNbTaAl_x (x = 0, 0.1, 0.2, 0.3) RHEAs with the single-phase body-centered cubic (BCC) structure and investigated the phase precipitation behavior of those alloys after annealing at 400–800°C for 100<!-- --> <!-- -->hours. When annealing temperatures were below 600°C, no significant changes were observed in the alloys' microstructure. However, after annealing at 800°C, all alloys precipitated Ti-rich phases. Remarkably, in addition to the hexagonal close-packed (HCP) Ti-rich phase, we identified a rare face-centered cubic (FCC) Ti-rich phase precipitating from the BCC matrix—a phenomenon seldom observed in Ti-containing HEAs and Ti alloys under normal conditions. In the TiVNbTa base alloy, the precipitate was predominantly an acicular FCC phase, while in Al0.1 and Al0.2, the formation of the FCC phase was suppressed, and a small amount of granular HCP phase precipitated at the grain boundary. When Al content (x) increased to 0.3, numerous rod-like FCC phase and granular HCP phase formed both at the grain boundary and within the grains. Although the addition of Al increased the yield strength of the RHEAs through solid-solution strengthening, the alloys' thermal stability decreased, and the fraction of precipitate phase generally increased with higher Al content. Therefore, a significant reduction in compressive yield strength and plasticity occurred in Al0.3 alloy after annealing at 800°C. These novel findings are crucial for enhancing our understanding of phase precipitation behavior in RHEAs at elevated temperatures.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"34 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-04-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143758235","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}