Intermetallics最新文献_第5页

Effect of Cr on nano-indentation Young's modulus and hardness of the β-Ti phase in equilibrium with α2-Ti3Al and γ-TiAl phases in Ti-Al-Cr alloys 铬对 Ti-Al-Cr 合金中与α2-Ti3Al 和 γ-TiAl 相平衡的 β-Ti 相的纳米压痕杨氏模量和硬度的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-21 DOI: 10.1016/j.intermet.2024.108543

Yotaro Okada, Sota Taniguchi , Ryosuke Yamagata , Hirotoyo Nakashima , Satoru Kobayashi, Masao Takeyama

{"title":"Effect of Cr on nano-indentation Young's modulus and hardness of the β-Ti phase in equilibrium with α2-Ti3Al and γ-TiAl phases in Ti-Al-Cr alloys","authors":"Yotaro Okada, Sota Taniguchi , Ryosuke Yamagata , Hirotoyo Nakashima , Satoru Kobayashi, Masao Takeyama","doi":"10.1016/j.intermet.2024.108543","DOIUrl":"10.1016/j.intermet.2024.108543","url":null,"abstract":"<div><div>Young's modulus and hardness of the constituent phases of β-Ti (bcc or B2), in equilibrium with α<sub>2</sub>-Ti<sub>3</sub>Al (D0<sub>19</sub>) and γ-TiAl (L1<sub>0</sub>) phases in Ti-Al-Cr ternary alloys were quantitatively evaluated in terms of the chemical composition analysis and nano-indentation method, in order to identify the Cr concentration dependence on the mechanical properties of the β phase. An alloy with a nominal composition of Ti-43Al-3Cr (at.%) decomposes into the three phases of β, α<sub>2</sub>, and γ by equilibrium heat treatment at 1373 K, with chemical composition of Ti-37.2Al-5.2Cr, Ti-38.9Al-2.2Cr, and Ti-47.4Al-1.4Cr, respectively. The β phase shows a Young's modulus of 141 ± 5 GPa, smaller and less orientation dependent than the other two phases of α<sub>2</sub> (174 ± 9 GPa) and γ phases (164 ± 15 GPa). In contrast, the β phase has a hardness of 5.9 ± 0.3 GPa, slightly softer than the α<sub>2</sub> phase (6.4 ± 0.8 GPa) but much harder than the γ phase (3.7 ± 0.6 GPa). The alloys Ti-44Al-4Cr and Ti-45Al-6Cr consist of two phases of β and γ phases, and the chemical composition of the β phase in these two alloys is Ti-36.5 Al-8.5 Cr and Ti-36.3 Al-13.9 Cr, respectively, with nearly the same Al concentration. The Young's modulus and hardness of the β phase with the latter composition become 158 GPa and 6.7 GPa, respectively, with increasing Cr content. These results found that the effect of solid solution Cr on the Young's modulus for β phase is relatively weak, and that on the hardness is strong, in comparison with that for the other two phases.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108543"},"PeriodicalIF":4.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532053","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improving strength-ductility balance of a brittle Al-doped FeCrNi multi-principal element alloy by introducing a heterostructure with hard phase enveloping soft phase 通过引入硬相包软相的异质结构改善脆性铝掺杂铁铬镍多主元合金的强度-电导率平衡

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-21 DOI: 10.1016/j.intermet.2024.108542

Yating Lin , Jinrong Wang , Lihao Hu , Lu Zhang , Rui Zhang , Jianxin Yu , Baolin Wu

{"title":"Improving strength-ductility balance of a brittle Al-doped FeCrNi multi-principal element alloy by introducing a heterostructure with hard phase enveloping soft phase","authors":"Yating Lin , Jinrong Wang , Lihao Hu , Lu Zhang , Rui Zhang , Jianxin Yu , Baolin Wu","doi":"10.1016/j.intermet.2024.108542","DOIUrl":"10.1016/j.intermet.2024.108542","url":null,"abstract":"<div><div>In the present work, a heterostructure was created in a brittle Al-doped FeCrNi multi-principal element alloy via thermomechanical treatment. This heterostructure consists of a hard phase surrounding a soft phase, with the soft defect-free face-centered cubic (FCC) phase formed through phase transformation evenly distributed within the hard body-centered cubic (BCC) matrix. This unique heterostructure promotes more uniform deformation, thereby enhancing the deformability of the original hard BCC matrix. As a result, the elongation was increased from 2.4 % to 17 %, while the ultimate tensile strength was just decreased from 1076 MPa to 1021 MPa. The maintenance of strength is primarily attributed to the hetero-deformation-induced (HDI) strengthening effect provided by this distinctive heterostructure. Overall, this special heterostructure formed through phase transformation opens up new possibilities for developing alloys with both high strength and ductility.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108542"},"PeriodicalIF":4.3,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532052","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

Laser welding of dissimilar TiAl/Ti6-Al-4V materials: Effects of rapid in-situ laser pre-heating on microstructure and mechanical properties of the welding joint 异种 TiAl/Ti6-Al-4V 材料的激光焊接：快速原位激光预热对焊点微观结构和机械性能的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108514

Qiyuan Yu , Yu Zhang , Ziyuan Jia , Lujun Huang , Lin Geng , Liqun Li

{"title":"Laser welding of dissimilar TiAl/Ti6-Al-4V materials: Effects of rapid in-situ laser pre-heating on microstructure and mechanical properties of the welding joint","authors":"Qiyuan Yu , Yu Zhang , Ziyuan Jia , Lujun Huang , Lin Geng , Liqun Li","doi":"10.1016/j.intermet.2024.108514","DOIUrl":"10.1016/j.intermet.2024.108514","url":null,"abstract":"<div><div>TiAl alloy has broad application prospects in the aerospace field. In practical working environments, connecting with other materials is considered an important means of fully utilizing their excellent properties. This study employed a laser in-situ pre-scanning method to preheat the weld seam, achieving the connection between TiAl alloy and Ti-6Al-4V. On this basis, the microstructural evolution of the fusion zone (FZ), fusion line (FL), and heat-affected zone (HAZ) of the welded joint was analyzed in detail. By comparing with traditional welding processes, the effects of laser in-situ preheating on the microstructure and properties of the welded joints were studied. The results showed that the FZ area consists of α<sub>2</sub> and martensitic α-Ti, while the FL on the TiAl side features a transition layer of β/B2 phases, providing plasticity and toughness to the welded joint. The in-situ scanning method reduced the cracks generated during welding, resulting in a more uniform distribution of the transition layer. The obtained FZ exhibited higher microhardness. The room temperature tensile strength of the welded joint reached 650 MPa. As the temperature increased, at 400 °C, the tensile strength and elongation reached 571 MPa and 3 %, respectively, significantly higher than the 450 MPa and 1.5 % achieved by conventional welding at the same temperature. When the temperature further increased to 500 °C and 600 °C, Ti-6Al-4V experienced significant softening, becoming the weak point of the welded joint.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108514"},"PeriodicalIF":4.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532051","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

Quaternary low melting point Sn-Bi-in-xGa solder with improved mechanical performance for advanced electronic packaging 用于先进电子封装的具有更佳机械性能的四元低熔点锡-铋-钆焊料

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108534

Jingyu Qiao , Xingchao Mao , Lulin Xie , Shichen Xie , King-Ning Tu , Yingxia Liu

{"title":"Quaternary low melting point Sn-Bi-in-xGa solder with improved mechanical performance for advanced electronic packaging","authors":"Jingyu Qiao , Xingchao Mao , Lulin Xie , Shichen Xie , King-Ning Tu , Yingxia Liu","doi":"10.1016/j.intermet.2024.108534","DOIUrl":"10.1016/j.intermet.2024.108534","url":null,"abstract":"<div><div>Managing thermal stress is important for ensuring the yield of chip integration and packaging. The development of appropriate low melting point solders has become the key to mitigating thermal stress during the assembling, which aligns well with the demands of next-generation interconnection technologies. In this study, we developed a quaternary low melting point solder based on Sn-Bi-In-xGa (x = 0, 0.1, 0.3, 0.5, 1.0, 1.5, wt%). The addition of Ga not only lowers the solder's melting point but also enhances its wettability. We also studied how the increase of Ga in the solder alloy influences the microstructure and shear test failure mechanism during aging. Upon subjecting solder joints to a 10-min reflow process at 100 °C with Cu substrates, two distinct types of intermetallic compound (IMC) were observed: Cu<sub>6</sub>(Sn, In)<sub>5</sub> when Ga content was ≤0.1 wt% and γ<sub>3</sub>-Cu<sub>9</sub>Ga<sub>4</sub> when Ga content was ≥0.3 wt%. The stable property of γ<sub>3</sub>-Cu<sub>9</sub>Ga<sub>4</sub> IMC ensures the mechanical stability of the joints during aging. Therefore, the addition of an appropriate amount of Ga (0.3 wt%) can improve the mechanical performance of solder joints during aging. These findings offer valuable insights for the development of high-performance low-melting-point solders in microelectronics, shedding light on the mechanisms underlying the influence of Ga content on solder microstructures and mechanical reliability during thermal aging.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108534"},"PeriodicalIF":4.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142532050","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

Design of novel structural eutectic high entropy alloys (EHEAs) containing high-temperature resistant alloying elements 设计含有耐高温合金元素的新型结构共晶高熵合金 (EHEAs)

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108535

Yang Gao , Yangchuan Cai , Yan Cui , Yanan Yan , Kai Wang

{"title":"Design of novel structural eutectic high entropy alloys (EHEAs) containing high-temperature resistant alloying elements","authors":"Yang Gao , Yangchuan Cai , Yan Cui , Yanan Yan , Kai Wang","doi":"10.1016/j.intermet.2024.108535","DOIUrl":"10.1016/j.intermet.2024.108535","url":null,"abstract":"<div><div>This article employs the “Simple Mixing Enthalpy Method” to add high-temperature alloying elements Mo/V and Nb to the Fe-Co-Cr-Ni-based alloy system, and utilizes a model of the relationship between elements and phase structures. Finally, EHEAs are successfully designed with the help of phase diagrams, namely FeCoNi2.0Cr1.2Mo0.2Nb0.63 (Mo<sub>0.2</sub>Nb<sub>0.63</sub>) and FeCoNi2.0Cr1.2V0.2Nb0.68 (V<sub>0.2</sub>Nb<sub>0.68</sub>). In EHEAs, a typical fully eutectic microstructure is observed, consisting of alternating FCC (face-centered cubic) and HCP (hexagonal close-packed) phases. Evaluation of mechanical performance indicators reveals that nano-hardness and elastic modulus increase from the FCC phase to the HCP phase, while the hardness and elastic modulus of the eutectic phase originate from modulation of these two phases. Meanwhile, the microhardness of both alloy systems increases linearly with increasing Nb content. In addition, EHEAs exhibit high strength and ductility but with differences attributed to the significant influence of Mo and V elements on eutectic phase spacing and phase size. Different phase interface types and strain gradients during deformation affect the mechanical properties. This study tests the high-temperature compression performance and fracture morphology of novel high-entropy alloys, paving the way for subsequent research on high-temperature performance.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108535"},"PeriodicalIF":4.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531946","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

Enhanced mechanical and wear properties of novel AlMgB14 intermetallic reinforced aluminum matrix nanocomposite 增强新型 AlMgB14 金属间增强铝基纳米复合材料的机械性能和耐磨性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-19 DOI: 10.1016/j.intermet.2024.108524

Elham Bakhshizade , Mehdi Khodaei , Ashkan Zolriasatein , Ali Shokuhfar

{"title":"Enhanced mechanical and wear properties of novel AlMgB14 intermetallic reinforced aluminum matrix nanocomposite","authors":"Elham Bakhshizade , Mehdi Khodaei , Ashkan Zolriasatein , Ali Shokuhfar","doi":"10.1016/j.intermet.2024.108524","DOIUrl":"10.1016/j.intermet.2024.108524","url":null,"abstract":"<div><div>Aluminum matrix composites are the most promising materials in various industries, such as automobiles and aerospace. However, their usage may be limited due to their low strength and low wear resistance in some functional applications. In this study, a novel aluminum matrix nanocomposite with desirable strength and tribological properties was synthesized by mechanical milling and hot-pressing. AlMgB<sub>14</sub> (called BAM) intermetallic with an average particle size of 32 nm was employed as the reinforcement (with different amounts of 0, 1, 3, and 5 wt%) in the aluminum matrix for the first time, aiming to improve the strength and wear resistance. The specimens were characterized by X-ray diffractometer (XRD), field-emission scanning electron microscope (FESEM), energy dispersive spectrum (EDS), hardness, compressive strength, and dry sliding testing. The results demonstrated that by increasing the BAM percentage, a significant enhancement in the mechanical properties and wear resistance of the aluminum matrix is achieved. The nanocomposite sample, which contains 5 wt% BAM nanoparticles exhibited a remarkable enhancement in microhardness (a 124 % improvement), yield strength (a 168 % increase), and ultimate strength (a 149 % increase) compared to the unreinforced aluminum sample. Furthermore, this sample demonstrated the best wear performance, with a 65 % reduction in coefficient of friction and an 82 % reduction in wear rate. The advancement in wear assessment can be attributed to the development of a mechanically milled layer (MML) on the surface subjected to wear. The findings highlight the suitability of the BAM intermetallic compound for enhancing the comprehensive properties of composites, particularly aluminum matrix composites.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108524"},"PeriodicalIF":4.3,"publicationDate":"2024-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142531945","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

Effect of Co distribution on the oxidation behavior of aluminide coatings in Mo-rich Ni-based single-crystal superalloy Co 分布对富钼镍基单晶超级合金中铝化物涂层氧化行为的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-18 DOI: 10.1016/j.intermet.2024.108531

X.Y. Chen , Y. Liu , H. Zhang , S.K. Gong , Y.L. Pei , S.S. Li

引用次数: 0

Microstructure and mechanical properties of electron beam welding of AlCoCrFeNi2.1 eutectic high entropy alloy 电子束焊接 AlCoCrFeNi2.1 共晶高熵合金的显微组织和机械性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108530

Shuai Li , Xiaotong Hou , Xin Liu , Zhongying Liu , Xingxing Wang , Tingting Wu , Yanchao Bai , Wei Zhao

{"title":"Microstructure and mechanical properties of electron beam welding of AlCoCrFeNi2.1 eutectic high entropy alloy","authors":"Shuai Li , Xiaotong Hou , Xin Liu , Zhongying Liu , Xingxing Wang , Tingting Wu , Yanchao Bai , Wei Zhao","doi":"10.1016/j.intermet.2024.108530","DOIUrl":"10.1016/j.intermet.2024.108530","url":null,"abstract":"<div><div>The dual-phase interleaved lamellar structure of the AlCoCrFeNi<sub>2.1</sub> eutectic high entropy alloy (EHEA) endows it with high strength, excellent plasticity and radiation resistance, thereby offering considerable potential as a structural material. Electron beam welding (EBW) is employed to fabricate homogenous welded joints of the heat-treated AlCoCrFeNi<sub>2.1</sub> EHEA. The experimental results indicate that the rapid cooling rate associated with EBW inhibits the diffusion of metal atoms and enhances the nucleation rate, thereby promoting the formation of a finer microstructure in the fusion zone (FZ). This markedly improves the mechanical properties of the welded joints, with the ultimate tensile strength of the welded joints exceeding that of the base material (BM). At a welding heat input of 123.5 J/mm, the ultimate tensile strength of the joint reaches a maximum of 990.3 MPa, resulting in a peak joint efficiency of 106.1 %. In comparison to the BM, the microhardness of the heat-affected zone (HAZ) exhibits a decrease of between 9.4 % and 11.4 %, while the microhardness of the FZ demonstrates an increase of between 10.0 % and 13.0 %. This study demonstrates the feasibility of employing EBW for the AlCoCrFeNi<sub>2.1</sub> EHEA, providing valuable insights for advancing its practical applications.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108530"},"PeriodicalIF":4.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446589","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

Microstructure, mechanical and oxygen-deficient lead-bismuth eutectic corrosion properties of FeCrAlTiMo high-entropy alloy coatings for fuel claddings 用于燃料包层的 FeCrAlTiMo 高熵合金涂层的显微结构、机械性能和缺氧铅铋共晶腐蚀性能

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108533

Jian Yang , Feifei Zhang , Lihong Zhai , Guofeng Qu , Jijun Yang

引用次数: 0

Effects of Ta/Nb/Ti addition on the microstructure and mechanical properties of novel CoNi-based superalloys fabricated by directed energy deposition 添加 Ta/Nb/Ti 对通过定向能沉积法制造的新型 CoNi 基超合金微观结构和力学性能的影响

IF 4.3 2区材料科学

Intermetallics Pub Date : 2024-10-17 DOI: 10.1016/j.intermet.2024.108527

Weiming Huang , Lilin Wang , Haozhi Chai , Xin Lin

{"title":"Effects of Ta/Nb/Ti addition on the microstructure and mechanical properties of novel CoNi-based superalloys fabricated by directed energy deposition","authors":"Weiming Huang , Lilin Wang , Haozhi Chai , Xin Lin","doi":"10.1016/j.intermet.2024.108527","DOIUrl":"10.1016/j.intermet.2024.108527","url":null,"abstract":"<div><div>The influence of alloying on the microstructure, particularly the phase precipitation behavior and the volume fraction of the γʹ phase, is critical for the development of precipitation-strengthed cobalt-based superalloys. In the context of additive manufacturing, it is also essential to consider how alloying elements affect the formability of these alloys. In this study, three developed CoNi-based superalloys, named as AlTa, AlTaNb and AlTaTi, were fabricated using laser directed energy deposition, and followed by homogenization and aging treatment. The effect of alloy composition on additive manufacturing formability, microstructure and mechanical properties was analyzed. The AlTa and AlTaNb specimens show good additive manufacturing formability, but the AlTaTi specimen appears several long cracks along deposition direction. The addition of Ti is not conducive to the additive manufacturing formability of CoNi-based superalloys. The volume fraction of the γ′ phase in the three heat-treated specimens is 65∼70 %, and the average size is about 200 nm. The AlTa specimen maintains its tensile strength without softening from room temperature to 900 °C, possessing an excellent yield strength of 471 MPa at 900 °C. The AlTaNb and AlTaTi specimens achieves higher tensile strength at room temperature due to the strengthening effect of Nb and Ti elements, but underwent premature intergranular fracture during high-temperature tensile testing due to the insufficient grain boundary strength. Futher grain boundary strengthening should be considered for them.</div></div>","PeriodicalId":331,"journal":{"name":"Intermetallics","volume":"175 ","pages":"Article 108527"},"PeriodicalIF":4.3,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142446587","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