Journal of Alloys and Compounds最新文献

{"title":"Effect of Cu content on the microstructure, mechanical and corrosion behavior of AlFeNiMnCux high-entropy alloys","authors":"Linjiansheng Zhao, Chenran Xu, Liyang Fang, Hongqun Tang, Yifang Ouyang, Xiaoma Tao","doi":"10.1016/j.jallcom.2025.180124","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180124","url":null,"abstract":"The microstructure, mechanical and corrosion behavior of AlFeNiMnCu_x (x = 0.5, 0.75, 1.0, 1.25) high-entropy alloys (HEAs) have been investigated. It is identified as the BCC solid solution. An increase in concentration of Cu promotes the formation of reinforced phases and increases solid solution strengthening, which enhances mechanical properties. Additionally, the incorporation of Cu results in the formation of FCC structures, which in turn facilitates the transformation of corrosion modes and thus inhibits the corrosion. Among the studied HEAs, AlFeNiMnCu HEA (x = 1.0) is particularly noteworthy on mechanical properties, exhibiting a yield strength of 1559<!-- --> <!-- -->MPa, a fracture strength of 1699<!-- --> <!-- -->MPa, a plastic strain of 14.3%, and a Vickers hardness of 563 HV. And AlFeNiMnCu HEA also exhibits excellent performance in electrochemical corrosion, as indicated by an <em>E</em>_{<em>corr</em>} of -678.5<!-- --> <!-- -->mV and an <em>I</em>_{<em>corr</em>} of 22.7 μA/cm². The results demonstrate that an increase in the Cu content has significant implications for microstructure, mechanical and corrosion behavior.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"58 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736833","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":"Comprehensive Luminescence Analysis of YTaO4:Er3+/Yb3+/Tm3+ co-doped Phosphor for Optical Thermometry and Color Tunable Device Applications","authors":", , Sheetal Kumari, Pooja Rohilla, Srinibas Barik, Kumari Ruchi, Kaushal Kumar, A.S. Rao, Aman Prasad","doi":"10.1016/j.jallcom.2025.180108","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180108","url":null,"abstract":"This study comprehensively investigated the structural, morphological and luminescence properties of YTaO₄ (YTO) phosphors tri-doped with rare earth ions. X-ray diffraction (XRD) confirmed the phase purity and crystallinity of the synthesized samples, while field emission scanning electron microscopy (FE-SEM) revealed comprehensive surface morphology and particle size distribution. The upconversion (UC) mechanisms in the Yb³⁺, Er³⁺ and Tm³⁺ doped system showed that varying Tm³⁺ content effectively modulates blue, green, and red emissions through energy transfer processes. The phosphors' thermometric behavior was evaluated in the 301-470<!-- --> <!-- -->K range, with a maximum relative sensitivity of 0.93% K^-1 being achieved by utilizing thermally coupled levels (TCLs) (²H_11/2 and ⁴S_3/2) of Er³⁺ ions in the as-prepared YTO:Er³⁺/Yb³⁺/Tm³⁺ phosphor. The color tunability of the prepared phosphors was explored through changes in dopant concentration, laser power, and temperature variations. These findings demonstrate the potential of YTaO₄: Er³⁺/Yb³⁺/Tm³⁺ phosphors for color-tunable luminescence and non-contact temperature sensing applications.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"22 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143745648","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":"Simultaneous Optimization of Strength and Bio-Corrosion Resistance in Biodegradable ZX10 Magnesium Alloy via Thermomechanical Processing and Annealing","authors":"Sreenivas Raguraman, Andrew Kim, Tunde Ayodeji, Adam J. Griebel, Diana Bershadsky, Tram Nguyen, Timothy P. Weihs","doi":"10.1016/j.jallcom.2025.180078","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180078","url":null,"abstract":"Magnesium alloys are increasingly recognized as promising materials for biodegradable implants due to their low density, biocompatibility, and favorable mechanical properties. However, achieving a balance between mechanical strength and bio-corrosion resistance remains a critical challenge. This study systematically investigates the effects of three thermomechanical processing routes—extrusion (EXT), Equal Channel Angular Pressing (ECAP), and ECAP followed by annealing at 150^∘C for 10 hours (ECAP-A)—on the ZX10 magnesium alloy. EXT produced coarse grains and moderate mechanical and corrosion performance. ECAP refined the grain structure and reduced the Mg₂Ca phase, leading to an 80% increase in hardness, improved yield strength, and enhanced ductility, but at the cost of a doubled corrosion rate due to high dislocation density. ECAP-A mitigated this drawback, reducing the corrosion rate to 1.50 mm/year while maintaining a high yield strength ( &gt; 200 MPa). This improvement was driven by a uniform distribution of the Ca₂Mg₆Zn₃ phase, further dissolution of the Mg₂Ca phase, and reduced dislocation density. These findings establish ECAP-A as an effective strategy to simultaneously optimize strength and bio-corrosion resistance, advancing the ZX10 magnesium alloy as a promising material for biodegradable implants.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"90 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736883","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":"Trimetallic (Cobalt-Nickel-Copper) phosphates with cake ball-Like morphology for highly efficient oxygen evolution reaction","authors":"Ali Akbar Asgharinezhad, Alireza Bahmani, Afsanehsadat Larimi, Farhad Khorasheh, Cyrus Ghotbi","doi":"10.1016/j.jallcom.2025.180102","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180102","url":null,"abstract":"Developing efficient, stable, and noble-metal-free electrocatalysts for the oxygen evolution reaction (OER) is both essential and challenging. This study presents a controlled synthesis approach for cobalt-nickel-copper trimetallic phosphide crystalline, derived from a trimetallic metal-organic framework (CoNiCu-MOF) precursor via low-temperature phosphorization. The morphology and structure of the synthesized materials were examined using XRD, Raman, FT-IR, FE-SEM, EDX, and TEM analyses. The OER performance was evaluated in a 1.0&lt;!-- --&gt; &lt;!-- --&gt;M KOH solution. The cake ball-like CoNiCuP exhibited superior performance, with an overpotential of 228&lt;!-- --&gt; &lt;!-- --&gt;mV, a Tafel slope of 41&lt;!-- --&gt; &lt;!-- --&gt;mV &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;mi mathvariant=\"italic\" is=\"true\"&gt;de&lt;/mi&gt;&lt;msup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&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=\"2.317ex\" role=\"img\" style=\"vertical-align: -0.235ex;\" viewbox=\"0 -896.2 2591.6 997.6\" width=\"6.019ex\" 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;use xlink:href=\"#MJMATHI-64\"&gt;&lt;/use&gt;&lt;use x=\"520\" xlink:href=\"#MJMATHI-65\" y=\"0\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(1153,0)\"&gt;&lt;g is=\"true\"&gt;&lt;g is=\"true\"&gt;&lt;use xlink:href=\"#MJMATHI-63\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(433,362)\"&gt;&lt;g is=\"true\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-2212\"&gt;&lt;/use&gt;&lt;/g&gt;&lt;g is=\"true\" transform=\"translate(550,0)\"&gt;&lt;use transform=\"scale(0.707)\" xlink:href=\"#MJMAIN-31\"&gt;&lt;/use&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;mi is=\"true\" mathvariant=\"italic\"&gt;de&lt;/mi&gt;&lt;msup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/span&gt;&lt;/span&gt;&lt;script type=\"math/mml\"&gt;&lt;math&gt;&lt;mi mathvariant=\"italic\" is=\"true\"&gt;de&lt;/mi&gt;&lt;msup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi is=\"true\"&gt;c&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;−&lt;/mo&gt;&lt;mn is=\"true\"&gt;1&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&gt;&lt;/math&gt;&lt;/script&gt;&lt;/span&gt;, and a double-layer capacitance of 1.73 mF &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;msup is=\"true\"&gt;&lt;mrow is=\"true\"&gt;&lt;mi mathvariant=\"italic\" is=\"true\"&gt;cm&lt;/mi&gt;&lt;/mrow&gt;&lt;mrow is=\"true\"&gt;&lt;mo is=\"true\"&gt;&amp;#x2212;&lt;/mo&gt;&lt;mn is=\"true\"&gt;2&lt;/mn&gt;&lt;/mrow&gt;&lt;/msup&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=\"2.317ex\" rol","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"11 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736362","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":"Microstructural evolution and mechanical properties of ZM6(Mg-Nd-Zr-Zn) alloy fabricated by wire arc additive manufacturing","authors":"Huahui Shi, Runai Liu, Hongsheng Chen, Wenxian Wang, Jun Zhou, Xiaochun Chen, Kaiyuan Liu","doi":"10.1016/j.jallcom.2025.180096","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180096","url":null,"abstract":"The wire arc additive manufacturing (WAAM) of Mg-Nd (rare-earth) alloys is of great significance for meeting the requirements of lightweight design and high manufacturing flexibility in large components. Thin walls of Mg-2.4Nd-0.3Zn-0.6Zr (ZM6, wt.%) alloy were prepared using the cold metal transfer (CMT)-WAAM process under three different parameters. The study focused on the forming quality, microstructure evolution and mechanical properties of the WAAM ZM6 alloy thin wall components. The results show that the thin-walled Mg alloy exhibits good formability with no obvious defects on the surface. Due to the influence of thermal cycling, the thin walls show a layered structure with alternating coarse and fine grains along the building direction. Furthermore, segregation of Mg₁₂Nd phase and Nd elements was observed along the α-Mg grain boundaries. The average grain sizes of fine and coarse equiaxed grains in the WAAM ZM6 alloy are 10.08 μm and 15.9 μm, respectively. From the bottom to the top, the hardness of ZM6 alloy thin-walled parts varies with the change of grain size, with an average hardness is 56.7 HV_0.2. The ultimate tensile strength in the traveling direction (TD) and building direction (BD) is 226<!-- --> <!-- -->MPa and 214<!-- --> <!-- -->MPa, indicating no significant anisotropy. Moreover, the elongation of the WAAM ZM6 Mg alloy reaches 15%, demonstrating good plasticity.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"38 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736364","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 high-temperature stress relief annealing on the recrystallization of pre-deformed Ni-based single crystal superalloy","authors":"F.Z. Xu, Y.C. Lin, D.X. Ma, G.C. Wu, B.W. Cheng, D.G. He, Y.X. Zhao, L Li, Y.P. Deng, J.H. Wei","doi":"10.1016/j.jallcom.2025.180056","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180056","url":null,"abstract":"Recrystallization (RX) is a grain defect caused by stress concentration in single-crystal (SX) superalloys. This study investigates the effects of high-temperature stress relief annealing (SRA) on the inhibition of RX, microstructural evolution, and dislocation distribution in pre-deformed Ni-based SX superalloys. Through indentation-induced deformation and subsequent SRA treatments (1150–1250°C for 5–20<!-- --> <!-- -->h) followed by solution heat treatment (SHT), the RX behavior, geometrically necessary dislocation (GND) density, and γ′ phase evolution were systematically analyzed. The results demonstrate that SRA pretreatment reduces GND density in deformation zones by 35.90% to 54.20%, however, it does not completely prevent the occurrence of RX. At SRA temperatures below 1200°C, cellular RX occurs, while equiaxed RX emerges at 1250°C due to γ′ phase dissolution and enhanced thermal activation. Prolonged SRA time and elevated temperatures initially reduce deformation stress by promoting dislocation annihilation and γ′ phase coarsening. However, excessive temperatures (&gt;1200°C) accelerate the formation of subgrain boundaries, triggering RX. This study reveals a critical relationship between dislocation recovery and RX behavior, providing insights into optimizing SRA parameters to mitigate RX defects in the manufacturing of SX turbine blades.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"24 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734016","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 interface microstructure on properties of TiCx/Cu composites synthesized by dissolving graphite particles in Cu-Ti melt","authors":"Lei Guo, Hao Sun, Yang Yang, Ning Zhang, Jiaqi Duan, Zhancheng Guo","doi":"10.1016/j.jallcom.2025.179960","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.179960","url":null,"abstract":"An approach for synthesizing TiC_x/Cu composites by dissolving graphite particles in a Cu-Ti alloy melt was investigated. The resulting TiC_x/Cu interface exhibited a distinctive \"Cu-interface transition layer-TiC_x\" sandwich-like structure. Results show that the initial Ti content (<em>W</em>_Ti) in the melt determines the stoichiometry of TiC_x within the matrix. Additionally, the interface transition layer, consisting of Cu, Ti, and C atoms, was shown to enhance the bonding strength between the reinforcement phase and the matrix. DFT calculations revealed that charge transfer between the transition layer and the Cu matrix (TiCu_yC_x/Cu) is greater than that between TiC_x and the Cu matrix (TiC_x/Cu). The formation of Cu-Cu metal bonds between the transition layer and the Cu matrix enhances the interface bonding, resulting in a more cohesive interface. Therefore, the TiC_x/Cu composite with a 30% volume fraction of Ti_xC prepared in this study has achieved a flexural strength of 1000<!-- --> <!-- -->MPa. This proposed method significantly improves the mechanical properties of TiC_x/Cu composites and offers a promising, cost-effective approach for producing ceramic/metal composites with strong interface microstructures and superior bonding strength.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"13 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734012","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-throughput evaluation of diffusion properties in fcc Co-Fe-X (X=V/Mn) alloys","authors":"Hui Yang, Xiangyu Chen, Huixin Liu, Xiangyang Yin, Shiyi Wen, Yuling Liu, Changfa Du, Peisheng Wang, Yong Du","doi":"10.1016/j.jallcom.2025.180055","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180055","url":null,"abstract":"Given the critical role of diffusion in material design, particularly its relationship with composition and structure, this study focuses on the diffusion properties in the Co-Fe-X (X=V/Mn) ternary systems, which are key sub-systems of high-entropy alloys. To carefully evaluate the interdiffusivity and atomic mobility for fcc Co-Fe-X (X=V/Mn) phase, annealing is performed at 1273, 1373, and 1473<!-- --> <!-- -->K on 12 diffusion couples for each ternary system. EPMA (Electron Probe Microanalysis) is used to measure composition profiles after annealing. To provide more reliable diffusion coefficients, atomic mobilities in fcc Co-V and Fe-Mn phases are re-optimized in this work. Subsequently, by employing the composition profiles and corresponding experimental conditions, the interdiffusivity and atomic mobility for fcc Co-Fe-X (X=V/Mn) phase are efficiently calculated through high-throughput NNIM (novel numerical inverse method) embedded in CALTPP (CALculation of ThermoPhysical Properties) software. The presently assessed interdiffusivities and atomic mobilities for fcc Co-Fe-X (X=V/Mn) phase are verified to be reliable as the NNIM-predicted composition profiles, interdiffusivities together with diffusion paths are consistent with the measured data. Moreover, key diffusion characteristics related to materials design associated with the fcc Co-Fe-X (X=V/Mn) phase are obtained and analyzed, including interdiffusivities, 2D composition profiles, frequency factors, and diffusion activation energies. The obtained atomic mobilities and diffusion characteristics demonstrate high reliability through experimental validation, which not only contributes to establishing the diffusion database but also provides crucial insights for designing high-entropy alloys.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"102 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736366","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 Evolution in Low Fe Concentration V1−xFexO2 Compounds: Phase diagram and Annealing Effects","authors":"Dimitra K. Manousou, Stefanos B. Atata, Yoo Jung Sohn, Polychronis Tsipas, Andrzej Grzechnik, Maria Calamiotou, Karen Friese, Spiros Gardelis","doi":"10.1016/j.jallcom.2025.180081","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180081","url":null,"abstract":"We present a comprehensive investigation into the synthesis, phase evolution and valence state of vanadium (V) in V_{1−<em>x</em>}Fe_<em>x</em>O₂ (<em>x</em> = 0 %, 0.5 %, 0.75 %, 1.0 %) compounds. Polycrystalline samples have been synthesized with solid-state reaction method, followed by thermal annealing. X-Ray Powder Diffraction (XRPD) analyzed by Le Bail method revealed the transformation from monoclinic (M1) phase (space group: <em>P</em>2₁∕<em>c</em>) to triclinic (T) one with increasing Fe concentration. Additionally, a monoclinic (M2) phase (space group: <em>C</em>2∕<em>m</em>) emerged at 1.0 % Fe doping. Temperature-dependent XRPD and diffuse reflectance measurements elucidated the phase transitions during heating cycles, showing the impact of Fe doping on the system’s behavior. The construction of a complete phase diagram for the V_{1−<em>x</em>}Fe_<em>x</em>O₂ system (x ≤ 1.0 %) was achieved, addressing ambiguities in the low-Fe concentration region. X-ray Photoelectron Spectroscopy (XPS) further confirmed the influence of Fe doping on the vanadium valence states, indicating an increase of V⁵⁺ sites and therefore a lattice distortion and stabilization of the triclinic phase. The metal-insulator transition temperature (<em>T</em>_<em>MIT</em>) appears to be almost constant. Post-annealing led to the reinstatement of the M1 phase in all samples, and a modified phase diagram was constructed. The accompanied decrease of V⁵⁺ ions contributed to the destabilization of the T and M2 phases, favoring the thermodynamically stable M1 phase. The findings provide valuable insights into the complex phase behavior of V_{1−<em>x</em>}Fe_<em>x</em>O₂ compounds, showcasing a significant interplay between charge redistribution, the vanadium valence state, and the oxygen defects of the system.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"183 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143736367","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 deposition strategy on microstructure and mechanical properties of 5356 aluminum alloy fabricated by arc plasma directed energy deposition","authors":"Qifei Zhang, Yangbiao Hao, Zhonghua Li, Pengfei Zhang, , Bi Jiawei, Chao Suo, Wenjuan Huo, Peikang Bai","doi":"10.1016/j.jallcom.2025.180086","DOIUrl":"https://doi.org/10.1016/j.jallcom.2025.180086","url":null,"abstract":"Cold metal transfer and pulse (CMT+P) composite arc plasma directed energy deposition (AP-DED) has excellent material utilization, low heat input, minimal distortion and stress, and strong interlayer bonding strength. In this study, three large-size block parts, namely parallel reciprocating scanning (PRS) block part, square cross scanning (SCS) block part, and interpolating stacking scanning (ISS) block part, were successfully prepared by using this technology. An infrared camera and a high-speed camera were used to study the CMT+P process. The mechanical properties and microstructure of 5356 aluminum alloy block parts have been studied under different deposition strategies. The results reveal a progressive reduction in microhardness from the bottom to the top of the parts fabricated using the three distinct deposition strategies, with the parts by the PRS strategy exhibiting the highest microhardness values. Tensile properties show that the SCS part has the worst anisotropy, the PRS part has the highest tensile properties in the vertical direction, and the ISS part has the highest tensile values in the horizontal direction. Different deposition strategies can be used to prepare parts according to different stress modes.","PeriodicalId":344,"journal":{"name":"Journal of Alloys and Compounds","volume":"2 1","pages":""},"PeriodicalIF":6.2,"publicationDate":"2025-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143734009","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}