International Journal of Refractory Metals & Hard Materials最新文献

{"title":"Comparative study of microstructure and mechanical properties of Nb-Ti-Al alloy fabricated by as-cast and laser directed energy deposition processing","authors":"Zhiping Sun ,&nbsp;RuiXue Du ,&nbsp;FengYing Zhang ,&nbsp;Enkui Zhuo ,&nbsp;Yanqiang Qiao","doi":"10.1016/j.ijrmhm.2025.107220","DOIUrl":"10.1016/j.ijrmhm.2025.107220","url":null,"abstract":"<div><div>Niobium alloy has attracted widespread attention in the aerospace industry due to its high strength, excellent weldability and formability. It is capable of producing structural thin plates and complex shaped parts by laser directed energy deposition (LDED). In this work, single-track Nb-37Ti-5Al samples were fabricated by LDED to optimize of processing parameters, then multi-track Nb-37Ti-5Al was prepared. The as cast Nb-37Ti-5Al was prepared to compare its mechanical properties with LDEDed alloy, the effect of oxygen content on the fracture behavior was revealed. LDEDed alloy has high strength and low ductility, which is mainly due to the high oxygen content in powder feedstocks. The stability, elastic properties, electronic structure of pure niobium (Nb), niobium with dissolved oxygen (Nb(O)), Nb-37Ti-5Al and Nb-37Ti-5Al with dissolved oxygen (Nb-37Ti-5Al(O)) were investigated using first principles calculation. Interstitial oxygen atom causes electron rearrangement of niobium, titanium and aluminum, which promotes the formation of ionic bonds and covalency bonds. This work provides new insight regarding the correlation between the interaction of oxygen and metallic elements at atomic-level and mechanical behavior.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107220"},"PeriodicalIF":4.2,"publicationDate":"2025-05-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923304","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":"Effects of B4C addition on microstructure and mechanical properties of Nb-16Si-20Ti alloys fabricated by laser melting deposition","authors":"Jing Liang,&nbsp;Zhina Xie,&nbsp;Xiuyuan Yin,&nbsp;Yikun Wang,&nbsp;Mengyue Wang,&nbsp;Changsheng Liu,&nbsp;Suiyuan Chen,&nbsp;Shuo Shang","doi":"10.1016/j.ijrmhm.2025.107221","DOIUrl":"10.1016/j.ijrmhm.2025.107221","url":null,"abstract":"<div><div>Practical applications for Nb<img>Si alloys encountered difficulties because of their low room temperature fracture toughness and machinability. To achieve rapid alloy formation and enhance its fracture toughness, this study explored the effect of B₄C additions on the microstructure and properties of Nb-16Si-20Ti alloy formed by Laser Melting Deposition (LMD). The results showed that the relative densities of LMDed alloys were all more than 97.0 % compared with arc melting alloys. The LMDed 0B₄C alloy consisted of Nbss, Nb₃Si, and Tiss phases. With the addition of B₄C increased from 0 to 0.50 at. %, Nb₃Si disappeared, a eutectic transformation reaction (Nb₃Si → Nbss+ α-Nb₅Si₃) occurred, resulting in an increase in the volume fraction of Nbss from 39.5 % to 50.3 %. Further increased the B₄C addition to 1.0 at. %, the microstructure transitioned from a Nbss+ α-Nb₅Si₃ eutectic structure (without B₄C addition) to a fine primary α-Nb₅Si₃ and (Nbss+α-Nb₅Si₃) hypereutectic structure (with volume fraction of all α-Nb₅Si₃ phases up to 41.4 %). The LMDed 1.0B₄C exhibited the highest fracture toughness of 10.7 MPa·m¹^/² among all alloys due to the refinement of the microstructure and the isotropic of the stresses in the equiaxed crystal Nbss. Meanwhile, its compressive strength at room temperature reached a maximum of 2203.3 MPa, a result attributed to the grain refinement strengthening, solid solution strengthening effect of carbon and boron in Nb₅Si₃, and the increase in silicide content (with a total volume fraction of silicide phases at 51.6 %).</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107221"},"PeriodicalIF":4.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143935001","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":"Adjusting recrystallization kinetics of WNiCo alloy by intensive shear strain","authors":"Josef Walek,&nbsp;Radim Kocich,&nbsp;Lenka Kunčická","doi":"10.1016/j.ijrmhm.2025.107219","DOIUrl":"10.1016/j.ijrmhm.2025.107219","url":null,"abstract":"<div><div>The study investigates the effects of intensive shear strain processing, performed by selected regimes of rotary swaging, on recrystallization kinetics and deformation behaviour of a WNiCo tungsten heavy alloy. The results of uniaxial hot compression tests and thorough microstructure observations indicate that the selected rotary swaging regime, especially the swaging temperature, influences significantly not only the occurrence and development of dynamic hardening/softening processes, which consequently influence the flow stress, but also the recrystallization kinetics as such. The deformation temperature of 1100 °C was sufficient to initiate dynamic recrystallization in the Ni<img>Co matrix, the average grain size within which decreased down to 1.9 μm. The deformation temperature of 1200 °C caused further softening within the matrix and intensified its plastic flow, which also supported joining of W agglomerates. Particularly the high swaging temperatures in combination with high strain rates (100 s⁻¹) imparted flow stress maxima exceeding 1100 MPa. From the computational perspective, the complex effect of the occurring structure-forming phenomena on the behaviour of the WNiCo alloy was mapped by creating a rheological model, predicting its flow stress development under a wide range of temperatures. The rheological model was created via a regression analysis on the experimental data, and can serve as a basis for prospective numerical simulations using the finite element method.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107219"},"PeriodicalIF":4.2,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Preparation of spherical tungsten trioxide by spray pyrolysis of peroxotungstic acid","authors":"Yuqing Qiu ,&nbsp;Pengyuan Liu ,&nbsp;Xingyu Chen ,&nbsp;Xuheng Liu ,&nbsp;Ailiang Chen ,&nbsp;Jiangtao Li ,&nbsp;Lihua He ,&nbsp;Fenglong Sun ,&nbsp;Zhongwei Zhao","doi":"10.1016/j.ijrmhm.2025.107215","DOIUrl":"10.1016/j.ijrmhm.2025.107215","url":null,"abstract":"<div><div>This paper proposes a short-process, environmentally friendly approach for preparing spherical tungsten oxide powder using peroxotungstic acid solution, and investigates the factors influencing the spray pyrolysis, as well as the underlying pyrolysis mechanism. The experimental results demonstrate that varying the concentration of peroxotungstic acid did not significantly affect droplet atomization efficiency, but more WO₃ led to the formation of coarser particles in a high-concentration solution. Droplets underwent uniform contraction at l80 °C, yielding smaller particles, whereas the formation of porous structures was promoted at 300 °C. Rapid carrier gas velocity (120 L/min) induced particle adhesion and the generation of secondary particles, yet it also facilitated the collection of finer particles. Furthermore, an increase in ultrasonic frequency correlated with a reduction in the particle size of the pyrolysis product. Solid spherical monoclinic tungsten trioxide could be obtained through low-temperature calcination at 400 °C without altering the particle morphology. This paper presents a promising solution to address the challenges of ammonia nitrogen pollution and process complexity in conventional tungsten refining.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107215"},"PeriodicalIF":4.2,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143916963","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":"Tool wear and surface integrity analysis of austenitic stainless-steel machining with variable-length restricted contact tools at large depth of cut","authors":"Xueqin Pang ,&nbsp;Rongbin Deng ,&nbsp;Xiaodong Yu ,&nbsp;Wenjun Deng ,&nbsp;Pengyu Shen","doi":"10.1016/j.ijrmhm.2025.107217","DOIUrl":"10.1016/j.ijrmhm.2025.107217","url":null,"abstract":"<div><div>Austenitic stainless steels face multiple challenges during machining, including poor workability, severe tool wear, and unfavorable surface quality. Considering the machining issues resulting from poor tool-chip contact conditions, novel restricted contact tools with variable tool-chip contact lengths were developed to enhance machining performance. In this study, a systematic analysis was conducted to investigate the impact of variable tool-chip contact lengths on tool wear and surface integrity during the wet machining of 316L austenitic stainless-steel. The results demonstrated a significant improvement in tribological characteristics, tool life, and surface integrity when developed restricted contact tools were applied. Compared with conventional restricted contact tools, the machining force, friction, tool wear, surface roughness, microhardness, and residual stress were reduced. The insights obtained from this investigation present an effective cutting method for austenitic stainless steels and offer a rationale for tool design and the achievement of high surface quality when machining hard-to-cut materials.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107217"},"PeriodicalIF":4.2,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908180","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":"Boosted high-temperature anti-wear of direct energy deposited Inconel 625 via vanadium and graphene nanoplatelets-induced in-situ hard phases","authors":"Tao Wang ,&nbsp;Zeyu Luo ,&nbsp;Jintao Wen ,&nbsp;Shuan Ma ,&nbsp;Lei Zhu","doi":"10.1016/j.ijrmhm.2025.107216","DOIUrl":"10.1016/j.ijrmhm.2025.107216","url":null,"abstract":"<div><div>To develop high-temperature anti-wear performance nickel-based composites, Inconel 625 (IN625), vanadium (V), and graphene nanoplatelets (GNPs) are mixed based on the principle of in-situ generation. IN625 and IN625 metal matrix composite (MMC) coatings with x V/GNPs (x = 4, 8, 12) were then prepared using Laser Direct Energy Deposition (LDED). The effects of V and GNPs on the microstructure, microhardness, and tribological properties of IN625 were investigated. The results showed that the addition of V and GNPs promoted the in-situ precipitation of hard phases (Nb, V)C and Cr₂₃C₆, which contributed to grain refinement. As the content of V and GNPs increased, the microhardness and anti-wear performance of IN625 MMC coatings gradually improved. Compared to IN625, the microhardness and room-temperature anti-wear performance of the 12 wt%-V/GNPs coating increased by 32.3 % and 3.5 times, respectively. Additionally, the wear rate of the four coatings decreased at a high temperature, which was associated with the forming of an oxide glaze. The improved high-temperature anti-wear performance of the IN625 MMC coatings can be attributed to the formation of the lubricating phase V₂O₅.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107216"},"PeriodicalIF":4.2,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143908179","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":"Optimizing feasible domains for parameter identification in multi-scales constitutive model of La-TZM alloy","authors":"Shichen Wang ,&nbsp;Junjie Wang ,&nbsp;Junzhou Yang ,&nbsp;Hua Wang ,&nbsp;Yanchao Li ,&nbsp;Wen Zhang ,&nbsp;Li Wang ,&nbsp;Hairui Xing ,&nbsp;Ping Hu ,&nbsp;Qiang Wang ,&nbsp;Rui Feng ,&nbsp;Bo Jin ,&nbsp;Kuaishe Wang","doi":"10.1016/j.ijrmhm.2025.107218","DOIUrl":"10.1016/j.ijrmhm.2025.107218","url":null,"abstract":"<div><div>This paper focuses on La-TZM alloy and introduces a novel method for multi-scale constitutive model parameter identification based on the BP neural network (BPNN) which has not been reported yet, aiming to enhance model prediction accuracy and improve parameter identification efficiency. When the Genetic Algorithm (GA) is used to identify parameters in multi-scale constitutive models with internal variables, common issues such as unstable results and limited prediction accuracy of micro-scale variables arise, and solutions to these problems have not been reported. Initially, traditional GA is used for parameter identification, and a parameter evaluation method based on parameter perturbation experiments is proposed to analyze the sensitivity of parameters to the model prediction results. Subsequently, BPNN is utilized to refine the threshold range of parameter identification. The results indicate that the multi-scale constitutive model of La-TZM alloy includes nine sensitive parameters (<span><math><mi>ΔG</mi></math></span>, <span><math><msub><mi>α</mi><mi>d</mi></msub></math></span>, <span><math><mi>ρ</mi></math></span>, <span><math><msub><mi>Q</mi><mi>b</mi></msub></math></span>, <span><math><msub><mi>β</mi><mn>1</mn></msub></math></span>, <span><math><msub><mi>γ</mi><mn>1</mn></msub></math></span>, <span><math><msub><mi>n</mi><mn>1</mn></msub><mo>,</mo><msub><mi>n</mi><mn>2</mn></msub><mo>,</mo><msub><mi>n</mi><mn>3</mn></msub></math></span>, and <span><math><msub><mi>f</mi><mi>g</mi></msub></math></span>). After optimizing the threshold values using BPNN, the stability of model identification and the prediction accuracy of micro-scale variables were significantly improved. Notably, the calculated results of the internal variable <span><math><msub><mi>ρ</mi><mi>gd</mi></msub></math></span> were consistent with microstructural test data, which can represent the evolution of geometrically necessary dislocations density related to La₂O₃ second-phase particle. In summary, this study proposes a new method for identifying multi-scale constitutive model parameters, which can enhance the macro and micro characterization accuracy of material plastic deformation.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107218"},"PeriodicalIF":4.2,"publicationDate":"2025-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144072625","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":"Functional-gradient WC-TiC cemented carbides with alternative binders (Ni and Fe)","authors":"Stella Sten ,&nbsp;Joakim Odqvist ,&nbsp;Susanne M. Norgren ,&nbsp;Peter Hedström","doi":"10.1016/j.ijrmhm.2025.107214","DOIUrl":"10.1016/j.ijrmhm.2025.107214","url":null,"abstract":"<div><div>In this work we investigate the development of functionally graded cemented carbides, featuring macro gradients on the millimeter scale, where Fe, or Ni is the binder phase. Two composites, WC-Ni and WC-Fe with 20 % binder by volume were produced by addition of TiC on the surface of the samples before sintering at 1475 °C for 1 h. The sintered samples were analyzed using electron microscopy and microanalysis.</div><div>For the Ni-binder sample, the results show a clear WC grain size gradient, with the smallest average grain size close to the TiC layer. This sample also exhibits compositional gradients, where Ni increases while Ti and C decrease from the added TiC layer and outward. The same effect of TiC addition on WC grain growth is observed in the Fe-binder sample, however, the effect is much smaller.</div><div>The addition of Ti is known to influence the morphology of WC grains in Co-binder systems, and this effect is observed here in both Ni- and Fe-binder samples. WC growth ledges areobserved on the WC facets near the applied TiC layer where Ti levels in the binder are high. This suggests that the WC grain growth inhibition mechanism imposed by Ti is similar in these alternative binders as what has previously been reported for conventional Co-binders.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107214"},"PeriodicalIF":4.2,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143923303","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":"Novel process for preparing zirconium by coupling CO2 capture and consumable anode electrolysis","authors":"Yuzhen Chen ,&nbsp;Rongcen Zhao ,&nbsp;Zepeng Lv ,&nbsp;Shaolong Li ,&nbsp;Jilin He ,&nbsp;Jianxun Song","doi":"10.1016/j.ijrmhm.2025.107213","DOIUrl":"10.1016/j.ijrmhm.2025.107213","url":null,"abstract":"<div><div>The intensifying global climate threat is predominantly fueled by carbon dioxide (CO₂) emissions from human activities. Although traditional carbon capture methods have advanced, they face significant challenges including high energy demands and secondary pollution risks, thus limiting their scalability. This study proposes a novel approach that integrates CO₂ capture with molten salt electrolysis for the preparation of zirconium (Zr). Using cyclic voltammetry (CV) and square wave voltammetry (SWV), we investigated the electrochemical reduction mechanism of CO₂ in a CaCl₂-CaO molten salt system. The phase transitions and controlled carbonization during the conversion of ZrO₂ to Zr-C-O composite product were carried out at various voltages (3.0–2.5 V for 8 h), and zirconium carboxide (ZrC_xO_y) were obtained at 3 V for 8 h. Electrolysis using ZrC_xO_y as the consumable anode yielded metallic Zr at 2.9 V for 8 h, displaying the potential of this dual approach to address both metal production and carbon capture.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107213"},"PeriodicalIF":4.2,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143899092","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":"Tribological and micromechanical performance of hard yet tough TiSiN/WN coatings: An experimental analysis of multilayer effects","authors":"Olga Maksakova ,&nbsp;Kateryna Smyrnova ,&nbsp;Barbora Ludrovcová ,&nbsp;Martin Sahul ,&nbsp;Marián Haršáni ,&nbsp;Martin Truchlý ,&nbsp;Miroslav Sahul ,&nbsp;Tomáš Vopát ,&nbsp;Matej Pašák ,&nbsp;Andrii Kozak ,&nbsp;Alexander Pogrebnjak","doi":"10.1016/j.ijrmhm.2025.107212","DOIUrl":"10.1016/j.ijrmhm.2025.107212","url":null,"abstract":"<div><div>Hard nitride coatings have the potential to serve as protective layers for cutting tools due to their excellent mechanical properties and wear resistance. To improve their mechanical, tribological, and high-temperature oxidation characteristics, the structural design of the coating is crucial. This study explores the micromechanical and tribological properties of multilayer WN/TiSiN and monolayer WN and TiSiN coatings prepared using magnetron sputtering. We compare the adhesion strength, wear resistance, and failure mechanisms in these systems. The multilayer WN/TiSiN coating demonstrates superior adhesion strength and crack resistance. Scratch tests confirm cohesive-adhesive failure modes with spallation localized to interfacial zones, allowing the coating to withstand extra loading. Tribological analysis revealed distinct wear mechanisms among the coatings. While the WN coating had the lowest wear rate (1.3 × 10⁻⁶ mm³/Nm), its poor adhesion and susceptibility to failure under stress reduced its reliability. Conversely, the TiSiN coating exhibits higher wear rates (2.4 × 10⁻⁶ mm³/Nm) but maintains stable performance through oxide film formation. On the other hand, the WN/TiSiN multilayer coating combined the strengths of both monolithic layers with moderate wear rates (1.7 × 10⁻⁶ mm³/Nm) and a low coefficient of friction (0.5). Raman spectroscopy confirmed the formation of protective oxide films, such as WO₃ and TiO₂, contributing to reduced wear and enhanced stability.</div></div>","PeriodicalId":14216,"journal":{"name":"International Journal of Refractory Metals & Hard Materials","volume":"131 ","pages":"Article 107212"},"PeriodicalIF":4.2,"publicationDate":"2025-04-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143890662","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}