IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-25 DOI: 10.1016/j.vacuum.2025.114283

Hao Wang , Fan Fei , Ruolan Tong , Jingxuan Li , Youtong Ren , Lin Song

{"title":"In-situ synchrotron HEXRD study on the stress relaxation behavior and internal stress evolution mechanism of a PM nickel-base superalloy","authors":"Hao Wang , Fan Fei , Ruolan Tong , Jingxuan Li , Youtong Ren , Lin Song","doi":"10.1016/j.vacuum.2025.114283","DOIUrl":"10.1016/j.vacuum.2025.114283","url":null,"abstract":"<div><div>FGH96 is a powder metallurgy nickel-base superalloy used for turbine disk of aero-engines. In this study, the evolution of micro-lattice stress and strain of FGH96 alloy during stress relaxation and thermal deformation was investigated by employing in-situ high-energy synchrotron radiation techniques. Results indicate that the relaxation of macroscopic compressive stress is closely related to the increased lattice strain in grains of different orientations. During high-temperature relaxation, the lattice stress of the (111)γ/γ′ and (220)γ/γ′ planes decreases rapidly in the initial relaxation phase and then stabilizes, while the lattice stress of the (200)γ/γ′ plane remain uniformly relaxed throughout, suggesting minimal load transfer between different grains. During the high-temperature compression and holding process, dynamic recrystallization partially releases the internal stress generated by work hardening. During the holding stage, different stress relaxation mechanisms were observed for grains of varying orientations, with (311) oriented grains primarily achieving this through dislocation rearrangement and sub-grain nucleation, while (220) oriented grains tend to migrate grain boundaries based on existing recrystallization nucleation.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114283"},"PeriodicalIF":3.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143724915","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}

引用次数: 0

Plasticity trends in Ag-based disordered solid solutions from first principles

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-25 DOI: 10.1016/j.vacuum.2025.114285

Shuang Zhao , Bing Zheng , Songzhao Gu , Taiyu Wang , Xiaochen Xie , Yong Wang , Hong Li , Sujun Shi , Xiuchen Zhao , Yongjun Huo

{"title":"Plasticity trends in Ag-based disordered solid solutions from first principles","authors":"Shuang Zhao , Bing Zheng , Songzhao Gu , Taiyu Wang , Xiaochen Xie , Yong Wang , Hong Li , Sujun Shi , Xiuchen Zhao , Yongjun Huo","doi":"10.1016/j.vacuum.2025.114285","DOIUrl":"10.1016/j.vacuum.2025.114285","url":null,"abstract":"<div><div>Ag-based solid solutions have attracted attention owing to their excellent plasticity to reduce the requirements of temperature, pressure, and surface flatness for solid-state bonding in electronic packaging field. In this study, the elastic constants and modulus, stacking fault energies (SFEs), twinnability, ideal shear strength and critical twinning stress of Ag-based solid solutions were computed using first-principles calculations. All the solid solutions studied were disordered, with Pt, Au, Zn, Ga, and Sn as solute elements. An approximate proportional correlation between unstable stacking fault energy and the product of shear modulus and Burger vector was identified. Notably, the average chemical and modulus mismatch factors were introduced to predict the changes in plasticity as a function of the alloying elements. These predictions were supported by results of ideal shear strength and critical twinning stress. Compared to others, the higher plasticity exhibited by (Ag)–8.33Sn positioned it as a promising material for the solid-state bonding application. The plasticity trends of various Ag-based disordered solid solutions were summarized, providing a theoretical basis for the selection of solid-state bonding materials in electronic packaging.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114285"},"PeriodicalIF":3.8,"publicationDate":"2025-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143715714","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}

引用次数: 0

Characterization of Fe nanoparticles on SrTiO3 (001) using X-ray photoelectron diffraction (XPD)

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-24 DOI: 10.1016/j.vacuum.2025.114281

Yosef S.A. Medeiros , Abner de Siervo , Richard Landers , Pedro A.P. Nascente , Enrique P.U. Otero , Tyson Back , Alexandre Pancotti

{"title":"Characterization of Fe nanoparticles on SrTiO3 (001) using X-ray photoelectron diffraction (XPD)","authors":"Yosef S.A. Medeiros , Abner de Siervo , Richard Landers , Pedro A.P. Nascente , Enrique P.U. Otero , Tyson Back , Alexandre Pancotti","doi":"10.1016/j.vacuum.2025.114281","DOIUrl":"10.1016/j.vacuum.2025.114281","url":null,"abstract":"<div><div>The perovskite ceramic strontium titanate (SrTiO<sub>3</sub> or STO) presents remarkable properties that make it very promising for catalytic, photocatalytic, electronic, magnetic, and spintronic applications. The bulk SrTiO<sub>3</sub> crystal consists of alternating TiO<sub>2</sub> and SrO layers along the (001) direction, with surfaces terminated by either layer. The deposition of Fe on SrTiO<sub>3</sub> (001) can provide Fe nanoparticles of interest for various applications. Adequate characterization of the properties and structures of these nanoparticles and substrate is essential. In this work, the formation and structure of Fe nanoparticles grown on SrTiO<sub>3</sub> (001) (√5 × √5)R26.6° surface were characterized by low energy electron diffraction (LEED) and X-ray photoelectron diffraction (XPD). The comparison between experimental and theoretical XPD results involving multiple scattering calculations indicates a coexistence of Fe nanoparticles in both bcc and fcc structures.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114281"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696103","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}

引用次数: 0

High-sensitive solar-blind β-Ga2O3 thin film photodetector deposited by PLD optimizing growth temperature

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-24 DOI: 10.1016/j.vacuum.2025.114282

Mingwei Jiang , Sergii Golovynskyi , Jiating Chen, Zecheng Yang, Tengjie Lv, Guang Huang, Zhenhua Sun, Ling Li, Honglei Wu, Baikui Li

{"title":"High-sensitive solar-blind β-Ga2O3 thin film photodetector deposited by PLD optimizing growth temperature","authors":"Mingwei Jiang , Sergii Golovynskyi , Jiating Chen, Zecheng Yang, Tengjie Lv, Guang Huang, Zhenhua Sun, Ling Li, Honglei Wu, Baikui Li","doi":"10.1016/j.vacuum.2025.114282","DOIUrl":"10.1016/j.vacuum.2025.114282","url":null,"abstract":"<div><div>Metal-semiconductor-metal photodetectors are fabricated on β-Ga<sub>2</sub>O<sub>3</sub> films grown by pulsed laser deposition at a wide range of temperatures from 400 to 650 °C. The films are β-phase with an oxygen deficiency and a bandgap of 4.65–4.84 eV. The photodetectors exhibit a narrow-band photocurrent with the main response peaked at 250 nm, which fits the solar-blind region. The epilayer deposited at 550 °C has the best crystal quality with a 4.84-eV bandgap, a responsivity of 8.5 A/W, a low dark current of 0.05 nA, an EQE of 4252 %, a detectivity of 9.5 × 10<sup>11</sup> Jones, and a slow kinetics of 0.2 s at room temperature. The photodetectors also possess a sublinear dependence of photoresponse upon illumination intensity, so the sensitivity lowers to 1 A/W at 26 μW/mm<sup>2</sup>. The responsivity increases with heating up to 24 A/W at 250 °C. There is also a minor defect component with the onset at 340 nm (3.66 eV), associated with the defect levels at 0.62, 0.85, 1.02 and 1.18 eV below the conduction band. The growth temperature optimization allows us to suppress this defect-related band. Moreover, a shallow defect level with an activation energy of 0.2 eV is involved in the photoresponse mechanism.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114282"},"PeriodicalIF":3.8,"publicationDate":"2025-03-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143747307","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}

引用次数: 0

Influence of solid-solution processes on the microstructure and dynamic impact behavior of cast Mg-Gd-Y-based alloys

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-22 DOI: 10.1016/j.vacuum.2025.114280

Xuezhao Wang , Ping Zhang , Xiaomin Jiang , Xue Chen , Youqiang Wang

{"title":"Influence of solid-solution processes on the microstructure and dynamic impact behavior of cast Mg-Gd-Y-based alloys","authors":"Xuezhao Wang , Ping Zhang , Xiaomin Jiang , Xue Chen , Youqiang Wang","doi":"10.1016/j.vacuum.2025.114280","DOIUrl":"10.1016/j.vacuum.2025.114280","url":null,"abstract":"<div><div>This research explores the influence of solid solution treatments on the microstructural characteristics and dynamic impact behavior of Mg-Gd-Y-Zr alloys. A comprehensive analysis of microstructural evolution under various solution treatment conditions was conducted using metallographic observation, scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), X-ray diffraction (XRD), and electron backscatter diffraction (EBSD). The mechanical response of the alloys under dynamic loading was assessed via impact testing using a split-Hopkinson pressure bar (SHPB).The results reveal that the most effective single-stage treatment occurs at 520 °C for 6 h, yielding an average grain size of approximately 50.6 μm. In contrast, the optimal two-stage solution treatment involves an initial annealing at 350 °C for 6 h, followed by heating at 520 °C for 1 h, leading to a refined grain structure with an average size of 46.8 μm. Both treatment methods significantly enhance impact resistance. Under a strain rate of 4000 s<sup>−1</sup>, the single-stage treated alloy attains a peak compressive strength of 512 MPa, which is attributed to the synergistic effects of dynamic precipitate formation and the presence of coarse rare-earth-rich particles. Meanwhile, the two-stage treated alloy exhibits a superior maximum compressive strength of 540 MPa, primarily due to grain refinement and alterations in the composition of rare-earth hydride particles, which contribute to enhanced deformation resistance.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114280"},"PeriodicalIF":3.8,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143716143","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}

引用次数: 0

Thermionic emission behavior of rare-earth lanthanum hexaboride polycrystal and single crystal

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-22 DOI: 10.1016/j.vacuum.2025.114277

Zengjie Gu , Yanhui Jia , Hong Gao , Xinyu Yang

引用次数: 0

Vacuum diffusion bonding strengthening mechanical properties of 304 stainless steel/low carbon steel composites by in-situ eutectic reaction

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-21 DOI: 10.1016/j.vacuum.2025.114279

Zelin Yan, Chenhao Sun, Shuang Liu, Xiangpeng Chang, Weiping Tong

{"title":"Vacuum diffusion bonding strengthening mechanical properties of 304 stainless steel/low carbon steel composites by in-situ eutectic reaction","authors":"Zelin Yan, Chenhao Sun, Shuang Liu, Xiangpeng Chang, Weiping Tong","doi":"10.1016/j.vacuum.2025.114279","DOIUrl":"10.1016/j.vacuum.2025.114279","url":null,"abstract":"<div><div>To effectively regulate high temperature on the properties of the base materials and the surface decarburization of low carbon steel (LCS) caused by the violent atomic interdiffusion, low-temperature vacuum diffusion bonding technology was used via graphite interlayer eutectic reaction with steel. Tunning the hardness distribution of different layer to improve the strength and ductility of 304 stainless steel (304SS)/LCS composite material by an in-situ eutectic reaction. Achieved a strong metallurgical bonded interface layer which consist of pearlite, austenite and M<sub>7</sub>C<sub>3</sub> carbide eutectic structure. As a result, the tensile test perpendicular to the interface shows that the yield strength, tensile strength and total elongation of 304SS/LCS composite material are 256 MPa, 419 MPa and 22 %, respectively. The tensile fracture location at LCS layer, demonstrating the superior mechanical properties of the interface layer and the strong metallurgical bonding between 304SS and LCS. This study presents an effective solution for achieving reliable bonding between 304SS and LCS, which can be used for vacuum diffusion bonding of stainless and carbon steels due to its beneficial eutectic reaction.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114279"},"PeriodicalIF":3.8,"publicationDate":"2025-03-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143696102","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}

引用次数: 0

Direct growth of graphene film on the silicon substrate with a nickel-ring remote catalyzation 利用镍环远程催化在硅基底上直接生长石墨烯薄膜

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-20 DOI: 10.1016/j.vacuum.2025.114275

Ning Hou , Ruiqi Zhang , Huawen Wang , Xu Chen , Jie Yu , Xin Xu , Hao Jiang , Xin Li

{"title":"Direct growth of graphene film on the silicon substrate with a nickel-ring remote catalyzation","authors":"Ning Hou , Ruiqi Zhang , Huawen Wang , Xu Chen , Jie Yu , Xin Xu , Hao Jiang , Xin Li","doi":"10.1016/j.vacuum.2025.114275","DOIUrl":"10.1016/j.vacuum.2025.114275","url":null,"abstract":"<div><div>Direct growth of graphene films on silicon substrates is significantly important to the applications of graphene in the field of photoelectronics. To suspend the impurities, defects, and quality degradation caused by transferring process from metallic substrate to the target substrates (silicon) in practical application scenarios, we developed a novel nickel-ring remote catalyzation method for in-situ growth of uniform and metal contamination-free graphene films on the silicon substrate via chemical vapor deposition (CVD). The Nickel was selected as a catalyst due to its high catalytic activity for methane dissociation, broad working temperature range, and absence of metal contamination. The catalyzation efficiency was significantly improved by nickel-ring remote catalyzation method which confirmed by CFD simulation. The obtained graphene films exhibited good uniformity and metal contamination-free which characterised by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS) mapping and X-ray photoelectron spectroscopy (XPS). The as-grown graphene/silicon had well-coupled interface without impurities, demonstrating excellent electrical and photoelectric properties compared to the previous studies, including a low sheet resistance of 161.35 <span><math><mrow><mo>±</mo></mrow></math></span> 0.67 Ω∙□<sup>−1</sup>, a high carrier mobility of 1355.1 ± 1.83 cm<sup>2</sup> V<sup>−1</sup> s<sup>−1</sup>, and a photoelectric responsivity of approximately 0.72 A W<sup>−1</sup> at 1550 nm laser light. The nickel-ring remote catalyzation method provides a new route for fabricating two-dimensional materials with low impurity content and high uniformity on silicon substrates, benefiting the application of two-dimensional materials in silicon-based optoelectronic devices.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114275"},"PeriodicalIF":3.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686974","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}

引用次数: 0

Fabrication of superhydrophobic AlCrN coatings and their tribological properties under dry and starved lubrication conditions 超疏水 AlCrN 涂层的制作及其在干燥和饥饿润滑条件下的摩擦学特性

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-20 DOI: 10.1016/j.vacuum.2025.114276

Jialiang Guo , Chengdi Li , Quanbin Du , Yuhuai Liu

{"title":"Fabrication of superhydrophobic AlCrN coatings and their tribological properties under dry and starved lubrication conditions","authors":"Jialiang Guo , Chengdi Li , Quanbin Du , Yuhuai Liu","doi":"10.1016/j.vacuum.2025.114276","DOIUrl":"10.1016/j.vacuum.2025.114276","url":null,"abstract":"<div><div>Hard coatings are essential for enhancing wear resistance and oxidation resistance in mechanical components, extending their service life. This study combines laser surface texturing (LST), cathodic arc evaporation (CAE), and 1H,1H,2H,2H-perfluorooctanetrichlorosilane (FOTS) chemical modification to fabricate superhydrophobic AlCrN coatings on TC4 titanium alloy. LST was used to create periodic line- and mesh-arrayed textures with scanning intervals of 150–450 μm, followed by CAE deposition and FOTS modification. Smaller scanning intervals enhanced wettability, achieving water contact angles up to 157.6° and water sliding angles as low as 5.4°. For laser-textured surfaces with a 150 μm interval, FOTS modification reduced the coefficient of friction by 10 % and 64 % under dry and starved-water lubrication, respectively. Under starved-oil lubrication, surface texturing and FOTS modification showed no significant advantage over polished surfaces. This study highlights the synergistic potential of surface texturing and chemical modification to improve coating functionality and durability, offering insights for diverse engineering applications.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114276"},"PeriodicalIF":3.8,"publicationDate":"2025-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686972","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}

引用次数: 0

The effect of multi-coupling of LPSO, γ'', and γ′ phases on the microstructural evolution and mechanical properties of Mg-Y-Ni alloys

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-03-19 DOI: 10.1016/j.vacuum.2025.114271

Pengju Chen , Yuhui Zhang , Pengfei Gao , Shengli Han , Donghai Ding , Jun Xia , Lei Yang , Xiaohui Zhang , Kaihong Zheng , Guoqing Xiao , Fusheng Pan

{"title":"The effect of multi-coupling of LPSO, γ'', and γ′ phases on the microstructural evolution and mechanical properties of Mg-Y-Ni alloys","authors":"Pengju Chen , Yuhui Zhang , Pengfei Gao , Shengli Han , Donghai Ding , Jun Xia , Lei Yang , Xiaohui Zhang , Kaihong Zheng , Guoqing Xiao , Fusheng Pan","doi":"10.1016/j.vacuum.2025.114271","DOIUrl":"10.1016/j.vacuum.2025.114271","url":null,"abstract":"<div><div>This study utilized powder metallurgy to prepare Mg-10Y-(0, 0.5, 1, 1.5) wt.% Ni alloys systematically investigated the grain size, precipitate characteristics, mechanical properties, and strengthening-toughening mechanisms. The results show that with increasing Ni content, the volume fraction of long-period stacking ordered (LPSO) phases in MgY-1.5Ni alloy increased to 15 %, accompanied by forming γ'' and γ′ phases. The multiphase coupling inhibited excessive grain growth during recrystallization and contributed to refining the grain size of the Mg-Y-Ni alloy. In particular, the extruded MgY-1.5 Ni alloy exhibited a significantly refined grain size of 670 nm, with tensile strength, yield strength, and elongation reaching 371 ± 1.5 MPa, 383 ± 6.9 MPa, and 14.5 ± 0.2 %, respectively, representing improvements of 46.6 %, 20.3 %, and 55.9 % compared to the Mg-10Y base alloy. The strength enhancement is attributed to kinking strengthening from LPSO phases and the hindrance of dislocation motion by γ'' and γ′ phases. The improvement in ductility is attributed to grain refinement and the activation of non-basal slip systems by LPSO phases. This study provides a theoretical basis for researching and applying Mg-RE alloys containing LPSO phases.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"238 ","pages":"Article 114271"},"PeriodicalIF":3.8,"publicationDate":"2025-03-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143686970","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}

引用次数: 0

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